C#工具类之数据库连接

一、SQL Server

/// <summary>
    /// 数据库的通用访问代码 
    /// 此类为抽象类，
    /// 不允许实例化，在应用时直接调用即可
    /// </summary>
    public abstract class SqlHelper
    {
        /// <summary>
        /// 数据库连接字符串
        /// </summary>

        public static string connectionString = "";


        // Hashtable to store cached parameters
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        #region ExecteNonQuery操作方法集合
        /// <summary>
        ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。
        /// 使用参数数组形式提供参数列表 
        /// </summary>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static bool ExecteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            try
            {
                SqlCommand cmd = new SqlCommand();
                using (SqlConnection conn = new SqlConnection(connectionString))
                {
                    //通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
                    PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                    int val = cmd.ExecuteNonQuery();
                    //清空SqlCommand中的参数列表
                    cmd.Parameters.Clear();
                    return val > 0 ? true : false;
                }
            }
            catch 
            {
                return false;
            }
            
        }

        /// <summary>
        ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。
        /// 使用参数数组形式提供参数列表 
        /// </summary>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static bool ExecteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            try
            {
                return ExecteNonQuery(connectionString, cmdType, cmdText, commandParameters);
            }
            catch 
            {
                return false;
            }

        }

        /// <summary>
        ///存储过程专用
        /// </summary>
        /// <param name="cmdText">存储过程的名字</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static bool ExecteNonQueryProducts(string cmdText, params SqlParameter[] commandParameters)
        {
            try
            {
                return ExecteNonQuery(CommandType.StoredProcedure, cmdText, commandParameters);

            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        ///Sql语句专用
        /// </summary>
        /// <param name="cmdText">T_Sql语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static bool ExecteNonQueryText(string cmdText, params SqlParameter[] commandParameters)
        {
            try
            {
                return ExecteNonQuery(CommandType.Text, cmdText, commandParameters);
            }
            catch 
            {
                return false;
            }
           
        }

        #endregion


        #region GetTable操作方法集合

        /// <summary>
        /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接
        /// 使用参数数组提供参数
        /// </summary>
        /// <param name="connecttionString">一个现有的数据库连接</param>
        /// <param name="cmdTye">SqlCommand命令类型</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTable(string connecttionString, CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
        {
            try
            {
                SqlCommand cmd = new SqlCommand();
                DataSet ds = new DataSet();
                using (SqlConnection conn = new SqlConnection(connecttionString))
                {
                    PrepareCommand(cmd, conn, null, cmdTye, cmdText, commandParameters);
                    SqlDataAdapter adapter = new SqlDataAdapter();
                    adapter.SelectCommand = cmd;
                    adapter.Fill(ds);
                }
                DataTableCollection table = ds.Tables;
                return table;
            }
            catch (Exception ex)
            {
                return null;
            }
            
        }

        /// <summary>
        /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接
        /// 使用参数数组提供参数
        /// </summary>
        /// <param name="cmdTye">SqlCommand命令类型</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTable(CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
        {
            try
            {
                return GetTable(SqlHelper.connectionString, cmdTye, cmdText, commandParameters);
            }
            catch 
            {
                return null;

            }
            
        }

        /// <summary>
        /// 存储过程专用
        /// </summary>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTableProducts(string cmdText, SqlParameter[] commandParameters)
        {
            try
            {
                return GetTable(CommandType.StoredProcedure, cmdText, commandParameters);
            }
            catch 
            {
                return null;
            }
        }

        /// <summary>
        /// Sql语句专用
        /// </summary>
        /// <param name="cmdText"> T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTableText(string cmdText, SqlParameter[] commandParameters)
        {
            try
            {
                return GetTable(CommandType.Text, cmdText, commandParameters);
            }
            catch 
            {
                System.Windows.Forms.MessageBox.Show("查询后台出现错误，请重试！");
                return null;
            }
        }

        #endregion


        #region 检查是否存在
        /// <summary>
        /// 检查是否存在 存在:true
        /// </summary>
        /// <param name="strSql">Sql语句</param>
        /// <param name="cmdParms">参数</param>
        /// <returns>bool结果</returns>
        public static bool Exists(string strSql, params SqlParameter[] cmdParms)
        {
            try
            {
                int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, cmdParms));
                if (cmdresult == 0)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            catch (Exception ex)
            {
                return false;
            }

        }
        #endregion


        #region 各方法SqlParameter参数处理
        /// <summary>
        /// 为执行命令准备参数
        /// </summary>
        /// <param name="cmd">SqlCommand 命令</param>
        /// <param name="conn">已经存在的数据库连接</param>
        /// <param name="trans">数据库事物处理</param>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">Command text，T-SQL语句 例如 Select * from Products</param>
        /// <param name="cmdParms">返回带参数的命令</param>
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {
            try
            {
                //判断数据库连接状态
                if (conn.State != ConnectionState.Open)
                    conn.Open();
                cmd.Connection = conn;
                cmd.CommandText = cmdText;
                //判断是否需要事物处理
                if (trans != null)
                    cmd.Transaction = trans;
                cmd.CommandType = cmdType;
                if (cmdParms != null)
                {
                    foreach (SqlParameter parm in cmdParms)
                        cmd.Parameters.Add(parm);
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show("连接服务器发生错误,请检查！", "错误！", MessageBoxButtons.OK, MessageBoxIcon.Error);
                System.Environment.Exit(0);
            }

        }

        #endregion


        #region 其他查询方法集合

        /// <summary>
        /// 执行命令，返回一个在连接字符串中指定的数据库结果集 
        /// 使用所提供的参数。
        /// </summary>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>A SqlDataReader containing the results</returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);
            // we use a try/catch here because if the method throws an exception we want to 
            // close the connection throw code, because no datareader will exist, hence the 
            // commandBehaviour.CloseConnection will not work
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }

        #region//ExecuteDataSet方法

        /// <summary>
        /// return a dataset
        /// </summary>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            try
            {
                using (SqlConnection conn = new SqlConnection(connectionString))
                {
                    PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                    SqlDataAdapter da = new SqlDataAdapter();
                    DataSet ds = new DataSet();
                    da.SelectCommand = cmd;
                    da.Fill(ds);
                    return ds;
                }
            }
            catch
            {
                throw;
            }
        }

        /// <summary>
        /// 返回一个DataSet
        /// </summary>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            return ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters);
        }

        /// <summary>
        /// 返回一个DataSet
        /// </summary>
        /// <param name="cmdText">存储过程的名字</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSetProducts(string cmdText, params SqlParameter[] commandParameters)
        {
            return ExecuteDataSet(connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
        }

        /// <summary>
        /// 返回一个DataSet
        /// </summary>
        /// <param name="cmdText">T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSetText(string cmdText, params SqlParameter[] commandParameters)
        {
            return ExecuteDataSet(connectionString, CommandType.Text, cmdText, commandParameters);
        }

        public static DataView ExecuteDataSet(string connectionString, string sortExpression, string direction, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            try
            {
                using (SqlConnection conn = new SqlConnection(connectionString))
                {
                    PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                    SqlDataAdapter da = new SqlDataAdapter();
                    DataSet ds = new DataSet();
                    da.SelectCommand = cmd;
                    da.Fill(ds);
                    DataView dv = ds.Tables[0].DefaultView;
                    dv.Sort = sortExpression + " " + direction;
                    return dv;
                }
            }
            catch
            {

                throw;
            }
        }
        #endregion

        #region // ExecuteScalar方法

        /// <summary>
        /// 返回第一行的第一列
        /// </summary>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个对象</returns>
        public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            return ExecuteScalar(SqlHelper.connectionString, cmdType, cmdText, commandParameters);
        }

        /// <summary>
        /// 返回第一行的第一列存储过程专用
        /// </summary>
        /// <param name="cmdText">存储过程的名字</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个对象</returns>
        public static object ExecuteScalarProducts(string cmdText, params SqlParameter[] commandParameters)
        {
            return ExecuteScalar(SqlHelper.connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
        }

        /// <summary>
        /// 返回第一行的第一列Sql语句专用
        /// </summary>
        /// <param name="cmdText">者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个对象</returns>
        public static object ExecuteScalarText(string cmdText, params SqlParameter[] commandParameters)
        {
            return ExecuteScalar(SqlHelper.connectionString, CommandType.Text, cmdText, commandParameters);
        }

        /// <summary>
        /// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                object val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>
        /// Execute a SqlCommand that returns the first column of the first record against an existing database connection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            object val = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            return val;
        }

        #endregion

        /// <summary>
        /// add parameter array to the cache
        /// </summary>
        /// <param name="cacheKey">Key to the parameter cache</param>
        /// <param name="cmdParms">an array of SqlParamters to be cached</param>
        public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }

        #endregion


       
    }

SQLHelper

using System;  
using System.Collections;  
using System.Collections.Specialized;  
using System.Data;  
using System.Data.SqlClient;  
using System.Configuration;  
using System.Data.Common;  
using System.Collections.Generic;  
namespace Maticsoft.DBUtility  
{  
    /// <summary>  
    /// 数据访问抽象基础类  
    /// </summary>  
    public abstract class DbHelperSQL  
    {  
        //数据库连接字符串(web.config来配置)，多数据库可使用DbHelperSQLP来实现.  
        public static string connectionString = "连接字符串";      
        public DbHelperSQL()  
        {              
        }  
 
        #region 公用方法  
        /// <summary>  
        /// 判断是否存在某表的某个字段  
        /// </summary>  
        /// <param name="tableName">表名称</param>  
        /// <param name="columnName">列名称</param>  
        /// <returns>是否存在</returns>  
        public static bool ColumnExists(string tableName, string columnName)  
        {  
            string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";  
            object res = GetSingle(sql);  
            if (res == null)  
            {  
                return false;  
            }  
            return Convert.ToInt32(res) > 0;  
        }  
        public static int GetMaxID(string FieldName, string TableName)  
        {  
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;  
            object obj = GetSingle(strsql);  
            if (obj == null)  
            {  
                return 1;  
            }  
            else  
            {  
                return int.Parse(obj.ToString());  
            }  
        }  
        public static bool Exists(string strSql)  
        {  
            object obj = GetSingle(strSql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        /// <summary>  
        /// 表是否存在  
        /// </summary>  
        /// <param name="TableName"></param>  
        /// <returns></returns>  
        public static bool TabExists(string TableName)  
        {  
            string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";  
            //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";  
            object obj = GetSingle(strsql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        public static bool Exists(string strSql, params SqlParameter[] cmdParms)  
        {  
            object obj = GetSingle(strSql, cmdParms);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        #endregion  
 
        #region  执行简单SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
  
        public static int ExecuteSqlByTime(string SQLString, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        cmd.CommandTimeout = Times;  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        
        /// <summary>  
        /// 执行Sql和Oracle滴混合事务  
        /// </summary>  
        /// <param name="list">SQL命令行列表</param>  
        /// <param name="oracleCmdSqlList">Oracle命令行列表</param>  
        /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>  
        public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                SqlCommand cmd = new SqlCommand();  
                cmd.Connection = conn;  
                SqlTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    foreach (CommandInfo myDE in list)  
                    {  
                        string cmdText = myDE.CommandText;  
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;  
                        PrepareCommand(cmd, conn, tx, cmdText, cmdParms);  
                        if (myDE.EffentNextType == EffentNextType.SolicitationEvent)  
                        {  
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                            {  
                                tx.Rollback();  
                                throw new Exception("违背要求"+myDE.CommandText+"必须符合select count(..的格式");  
                                //return 0;  
                            }  
  
                            object obj = cmd.ExecuteScalar();  
                            bool isHave = false;  
                            if (obj == null && obj == DBNull.Value)  
                            {  
                                isHave = false;  
                            }  
                            isHave = Convert.ToInt32(obj) > 0;  
                            if (isHave)  
                            {  
                                //引发事件  
                                myDE.OnSolicitationEvent();  
                            }  
                        }  
                        if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)  
                        {  
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");  
                                //return 0;  
                            }  
  
                            object obj = cmd.ExecuteScalar();  
                            bool isHave = false;  
                            if (obj == null && obj == DBNull.Value)  
                            {  
                                isHave = false;  
                            }  
                            isHave = Convert.ToInt32(obj) > 0;  
  
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");  
                                //return 0;  
                            }  
                            if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");  
                                //return 0;  
                            }  
                            continue;  
                        }  
                        int val = cmd.ExecuteNonQuery();  
                        if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)  
                        {  
                            tx.Rollback();  
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");  
                            //return 0;  
                        }  
                        cmd.Parameters.Clear();  
                    }  
                    string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");  
                    bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);  
                    if (!res)  
                    {  
                        tx.Rollback();  
                        throw new Exception("Oracle执行失败");  
                        // return -1;  
                    }  
                    tx.Commit();  
                    return 1;  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    tx.Rollback();  
                    throw e;  
                }  
                catch (Exception e)  
                {  
                    tx.Rollback();  
                    throw e;  
                }  
            }  
        }          
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public static int ExecuteSqlTran(List<String> SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                SqlCommand cmd = new SqlCommand();  
                cmd.Connection = conn;  
                SqlTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    int count = 0;  
                    for (int n = 0; n < SQLStringList.Count; n++)  
                    {  
                        string strsql = SQLStringList[n];  
                        if (strsql.Trim().Length > 1)  
                        {  
                            cmd.CommandText = strsql;  
                            count += cmd.ExecuteNonQuery();  
                        }  
                    }  
                    tx.Commit();  
                    return count;  
                }  
                catch  
                {  
                    tx.Rollback();  
                    return 0;  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, string content)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand(SQLString, connection);  
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public static object ExecuteSqlGet(string SQLString, string content)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand(SQLString, connection);  
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    object obj = cmd.ExecuteScalar();  
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                    {  
                        return null;  
                    }  
                    else  
                    {  
                        return obj;  
                    }  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)  
        /// </summary>  
        /// <param name="strSQL">SQL语句</param>  
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand(strSQL, connection);  
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);  
                myParameter.Value = fs;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        public static object GetSingle(string SQLString, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        cmd.CommandTimeout = Times;  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(string strSQL)  
        {  
            SqlConnection connection = new SqlConnection(connectionString);  
            SqlCommand cmd = new SqlCommand(strSQL, connection);  
            try  
            {  
                connection.Open();  
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                return myReader;  
            }  
            catch (System.Data.SqlClient.SqlException e)  
            {  
                throw e;  
            }     
  
        }  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);  
                    command.Fill(ds, "ds");  
                }  
                catch (System.Data.SqlClient.SqlException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
        public static DataSet Query(string SQLString, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);  
                    command.SelectCommand.CommandTimeout = Times;  
                    command.Fill(ds, "ds");  
                }  
                catch (System.Data.SqlClient.SqlException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
 
 
 
        #endregion  
 
        #region 执行带参数的SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        int rows = cmd.ExecuteNonQuery();  
                        cmd.Parameters.Clear();  
                        return rows;  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        throw e;  
                    }  
                }  
            }  
        }  
  
  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public static void ExecuteSqlTran(Hashtable SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    {  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    { int count = 0;  
                        //循环  
                        foreach (CommandInfo myDE in cmdList)  
                        {  
                            string cmdText = myDE.CommandText;  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                             
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)  
                            {  
                                if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
  
                                object obj = cmd.ExecuteScalar();  
                                bool isHave = false;  
                                if (obj == null && obj == DBNull.Value)  
                                {  
                                    isHave = false;  
                                }  
                                isHave = Convert.ToInt32(obj) > 0;  
  
                                if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
                                if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
                                continue;  
                            }  
                            int val = cmd.ExecuteNonQuery();  
                            count += val;  
                            if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)  
                            {  
                                trans.Rollback();  
                                return 0;  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                        return count;  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    {  
                        int indentity = 0;  
                        //循环  
                        foreach (CommandInfo myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.CommandText;  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.InputOutput)  
                                {  
                                    q.Value = indentity;  
                                }  
                            }  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.Output)  
                                {  
                                    indentity = Convert.ToInt32(q.Value);  
                                }  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    {  
                        int indentity = 0;  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.InputOutput)  
                                {  
                                    q.Value = indentity;  
                                }  
                            }  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.Output)  
                                {  
                                    indentity = Convert.ToInt32(q.Value);  
                                }  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString, params SqlParameter[] cmdParms)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        object obj = cmd.ExecuteScalar();  
                        cmd.Parameters.Clear();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        throw e;  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)  
        {  
            SqlConnection connection = new SqlConnection(connectionString);  
            SqlCommand cmd = new SqlCommand();  
            try  
            {  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                cmd.Parameters.Clear();  
                return myReader;  
            }  
            catch (System.Data.SqlClient.SqlException e)  
            {  
                throw e;  
            }  
            //          finally  
            //          {  
            //              cmd.Dispose();  
            //              connection.Close();  
            //          }     
  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString, params SqlParameter[] cmdParms)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand();  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))  
                {  
                    DataSet ds = new DataSet();  
                    try  
                    {  
                        da.Fill(ds, "ds");  
                        cmd.Parameters.Clear();  
                    }  
                    catch (System.Data.SqlClient.SqlException ex)  
                    {  
                        throw new Exception(ex.Message);  
                    }  
                    return ds;  
                }  
            }  
        }  
  
  
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)  
        {  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            if (trans != null)  
                cmd.Transaction = trans;  
            cmd.CommandType = CommandType.Text;//cmdType;  
            if (cmdParms != null)  
            {  
  
  
                foreach (SqlParameter parameter in cmdParms)  
                {  
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&  
                        (parameter.Value == null))  
                    {  
                        parameter.Value = DBNull.Value;  
                    }  
                    cmd.Parameters.Add(parameter);  
                }  
            }  
        }  
 
        #endregion  
 
        #region 存储过程操作  
  
        /// <summary>  
        /// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>SqlDataReader</returns>  
        public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)  
        {  
            SqlConnection connection = new SqlConnection(connectionString);  
            SqlDataReader returnReader;  
            connection.Open();  
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);  
            command.CommandType = CommandType.StoredProcedure;  
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);  
            return returnReader;  
              
        }  
  
  
        /// <summary>  
        /// 执行存储过程  
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <param name="tableName">DataSet结果中的表名</param>  
        /// <returns>DataSet</returns>  
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet dataSet = new DataSet();  
                connection.Open();  
                SqlDataAdapter sqlDA = new SqlDataAdapter();  
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);  
                sqlDA.Fill(dataSet, tableName);  
                connection.Close();  
                return dataSet;  
            }  
        }  
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet dataSet = new DataSet();  
                connection.Open();  
                SqlDataAdapter sqlDA = new SqlDataAdapter();  
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);  
                sqlDA.SelectCommand.CommandTimeout = Times;  
                sqlDA.Fill(dataSet, tableName);  
                connection.Close();  
                return dataSet;  
            }  
        }  
  
  
        /// <summary>  
        /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)  
        /// </summary>  
        /// <param name="connection">数据库连接</param>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>SqlCommand</returns>  
        private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)  
        {  
            SqlCommand command = new SqlCommand(storedProcName, connection);  
            command.CommandType = CommandType.StoredProcedure;  
            foreach (SqlParameter parameter in parameters)  
            {  
                if (parameter != null)  
                {  
                    // 检查未分配值的输出参数,将其分配以DBNull.Value.  
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&  
                        (parameter.Value == null))  
                    {  
                        parameter.Value = DBNull.Value;  
                    }  
                    command.Parameters.Add(parameter);  
                }  
            }  
  
            return command;  
        }  
  
        /// <summary>  
        /// 执行存储过程，返回影响的行数        
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <param name="rowsAffected">影响的行数</param>  
        /// <returns></returns>  
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                int result;  
                connection.Open();  
                SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);  
                rowsAffected = command.ExecuteNonQuery();  
                result = (int)command.Parameters["ReturnValue"].Value;  
                //Connection.Close();  
                return result;  
            }  
        }  
  
        /// <summary>  
        /// 创建 SqlCommand 对象实例(用来返回一个整数值)     
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>SqlCommand 对象实例</returns>  
        private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)  
        {  
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);  
            command.Parameters.Add(new SqlParameter("ReturnValue",  
                SqlDbType.Int, 4, ParameterDirection.ReturnValue,  
                false, 0, 0, string.Empty, DataRowVersion.Default, null));  
            return command;  
        }  
        #endregion  
  
    }  
  
}  

DBHelperSQL （注意：需引用类库DBUtility.dll，下载地址：http://download.csdn.net/detail/airrose/3275957）

using System;  
using System.Collections;  
using System.Collections.Specialized;  
using System.Data;  
using System.Data.SqlClient;  
using System.Configuration;  
using System.Data.Common;  
using System.Collections.Generic;  
namespace Maticsoft.DBUtility  
{  
    /// <summary>  
    /// 数据访问类，可用于访问不同数据库  
    /// </summary>  
    public class DbHelperSQLP  
    {  
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.       
        public string connectionString = "连接字符串";     
        public DbHelperSQLP()  
        {              
        }  
        public DbHelperSQLP(string ConnectionString)  
        {  
            connectionString = ConnectionString;      
        }  
 
        #region 公用方法  
        /// <summary>  
        /// 判断是否存在某表的某个字段  
        /// </summary>  
        /// <param name="tableName">表名称</param>  
        /// <param name="columnName">列名称</param>  
        /// <returns>是否存在</returns>  
        public bool ColumnExists(string tableName, string columnName)  
        {  
            string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";  
            object res = GetSingle(sql);  
            if (res == null)  
            {  
                return false;  
            }  
            return Convert.ToInt32(res) > 0;  
        }  
        public int GetMaxID(string FieldName, string TableName)  
        {  
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;  
            object obj = GetSingle(strsql);  
            if (obj == null)  
            {  
                return 1;  
            }  
            else  
            {  
                return int.Parse(obj.ToString());  
            }  
        }  
        public bool Exists(string strSql)  
        {  
            object obj = GetSingle(strSql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        /// <summary>  
        /// 表是否存在  
        /// </summary>  
        /// <param name="TableName"></param>  
        /// <returns></returns>  
        public bool TabExists(string TableName)  
        {  
            string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";  
            //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";  
            object obj = GetSingle(strsql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        public bool Exists(string strSql, params SqlParameter[] cmdParms)  
        {  
            object obj = GetSingle(strSql, cmdParms);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        #endregion  
 
        #region  执行简单SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public int ExecuteSql(string SQLString)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
  
        public int ExecuteSqlByTime(string SQLString, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        cmd.CommandTimeout = Times;  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        
        /// <summary>  
        /// 执行Sql和Oracle滴混合事务  
        /// </summary>  
        /// <param name="list">SQL命令行列表</param>  
        /// <param name="oracleCmdSqlList">Oracle命令行列表</param>  
        /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>  
        public int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                SqlCommand cmd = new SqlCommand();  
                cmd.Connection = conn;  
                SqlTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    foreach (CommandInfo myDE in list)  
                    {  
                        string cmdText = myDE.CommandText;  
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;  
                        PrepareCommand(cmd, conn, tx, cmdText, cmdParms);  
                        if (myDE.EffentNextType == EffentNextType.SolicitationEvent)  
                        {  
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                            {  
                                tx.Rollback();  
                                throw new Exception("违背要求"+myDE.CommandText+"必须符合select count(..的格式");  
                                //return 0;  
                            }  
  
                            object obj = cmd.ExecuteScalar();  
                            bool isHave = false;  
                            if (obj == null && obj == DBNull.Value)  
                            {  
                                isHave = false;  
                            }  
                            isHave = Convert.ToInt32(obj) > 0;  
                            if (isHave)  
                            {  
                                //引发事件  
                                myDE.OnSolicitationEvent();  
                            }  
                        }  
                        if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)  
                        {  
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");  
                                //return 0;  
                            }  
  
                            object obj = cmd.ExecuteScalar();  
                            bool isHave = false;  
                            if (obj == null && obj == DBNull.Value)  
                            {  
                                isHave = false;  
                            }  
                            isHave = Convert.ToInt32(obj) > 0;  
  
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");  
                                //return 0;  
                            }  
                            if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");  
                                //return 0;  
                            }  
                            continue;  
                        }  
                        int val = cmd.ExecuteNonQuery();  
                        if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)  
                        {  
                            tx.Rollback();  
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");  
                            //return 0;  
                        }  
                        cmd.Parameters.Clear();  
                    }  
                    string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");  
                    bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);  
                    if (!res)  
                    {  
                        tx.Rollback();  
                        throw new Exception("Oracle执行失败");  
                        // return -1;  
                    }  
                    tx.Commit();  
                    return 1;  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    tx.Rollback();  
                    throw e;  
                }  
                catch (Exception e)  
                {  
                    tx.Rollback();  
                    throw e;  
                }  
            }  
        }          
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public int ExecuteSqlTran(List<String> SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                SqlCommand cmd = new SqlCommand();  
                cmd.Connection = conn;  
                SqlTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    int count = 0;  
                    for (int n = 0; n < SQLStringList.Count; n++)  
                    {  
                        string strsql = SQLStringList[n];  
                        if (strsql.Trim().Length > 1)  
                        {  
                            cmd.CommandText = strsql;  
                            count += cmd.ExecuteNonQuery();  
                        }  
                    }  
                    tx.Commit();  
                    return count;  
                }  
                catch  
                {  
                    tx.Rollback();  
                    return 0;  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public int ExecuteSql(string SQLString, string content)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand(SQLString, connection);  
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public object ExecuteSqlGet(string SQLString, string content)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand(SQLString, connection);  
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    object obj = cmd.ExecuteScalar();  
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                    {  
                        return null;  
                    }  
                    else  
                    {  
                        return obj;  
                    }  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)  
        /// </summary>  
        /// <param name="strSQL">SQL语句</param>  
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>  
        /// <returns>影响的记录数</returns>  
        public int ExecuteSqlInsertImg(string strSQL, byte[] fs)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand(strSQL, connection);  
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);  
                myParameter.Value = fs;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.SqlClient.SqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public object GetSingle(string SQLString)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        public object GetSingle(string SQLString, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        cmd.CommandTimeout = Times;  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>SqlDataReader</returns>  
        public SqlDataReader ExecuteReader(string strSQL)  
        {  
            SqlConnection connection = new SqlConnection(connectionString);  
            SqlCommand cmd = new SqlCommand(strSQL, connection);  
            try  
            {  
                connection.Open();  
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                return myReader;  
            }  
            catch (System.Data.SqlClient.SqlException e)  
            {  
                throw e;  
            }     
  
        }  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public DataSet Query(string SQLString)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);  
                    command.Fill(ds, "ds");  
                }  
                catch (System.Data.SqlClient.SqlException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
        public DataSet Query(string SQLString, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);  
                    command.SelectCommand.CommandTimeout = Times;  
                    command.Fill(ds, "ds");  
                }  
                catch (System.Data.SqlClient.SqlException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
 
 
 
        #endregion  
 
        #region 执行带参数的SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        int rows = cmd.ExecuteNonQuery();  
                        cmd.Parameters.Clear();  
                        return rows;  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        throw e;  
                    }  
                }  
            }  
        }  
  
  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public void ExecuteSqlTran(Hashtable SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    {  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    { int count = 0;  
                        //循环  
                        foreach (CommandInfo myDE in cmdList)  
                        {  
                            string cmdText = myDE.CommandText;  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                             
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)  
                            {  
                                if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
  
                                object obj = cmd.ExecuteScalar();  
                                bool isHave = false;  
                                if (obj == null && obj == DBNull.Value)  
                                {  
                                    isHave = false;  
                                }  
                                isHave = Convert.ToInt32(obj) > 0;  
  
                                if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
                                if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
                                continue;  
                            }  
                            int val = cmd.ExecuteNonQuery();  
                            count += val;  
                            if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)  
                            {  
                                trans.Rollback();  
                                return 0;  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                        return count;  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    {  
                        int indentity = 0;  
                        //循环  
                        foreach (CommandInfo myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.CommandText;  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.InputOutput)  
                                {  
                                    q.Value = indentity;  
                                }  
                            }  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.Output)  
                                {  
                                    indentity = Convert.ToInt32(q.Value);  
                                }  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>  
        public void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)  
        {  
            using (SqlConnection conn = new SqlConnection(connectionString))  
            {  
                conn.Open();  
                using (SqlTransaction trans = conn.BeginTransaction())  
                {  
                    SqlCommand cmd = new SqlCommand();  
                    try  
                    {  
                        int indentity = 0;  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.InputOutput)  
                                {  
                                    q.Value = indentity;  
                                }  
                            }  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            foreach (SqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.Output)  
                                {  
                                    indentity = Convert.ToInt32(q.Value);  
                                }  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public object GetSingle(string SQLString, params SqlParameter[] cmdParms)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                using (SqlCommand cmd = new SqlCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        object obj = cmd.ExecuteScalar();  
                        cmd.Parameters.Clear();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SqlClient.SqlException e)  
                    {  
                        throw e;  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>SqlDataReader</returns>  
        public SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)  
        {  
            SqlConnection connection = new SqlConnection(connectionString);  
            SqlCommand cmd = new SqlCommand();  
            try  
            {  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                cmd.Parameters.Clear();  
                return myReader;  
            }  
            catch (System.Data.SqlClient.SqlException e)  
            {  
                throw e;  
            }  
            //          finally  
            //          {  
            //              cmd.Dispose();  
            //              connection.Close();  
            //          }     
  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public DataSet Query(string SQLString, params SqlParameter[] cmdParms)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlCommand cmd = new SqlCommand();  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))  
                {  
                    DataSet ds = new DataSet();  
                    try  
                    {  
                        da.Fill(ds, "ds");  
                        cmd.Parameters.Clear();  
                    }  
                    catch (System.Data.SqlClient.SqlException ex)  
                    {  
                        throw new Exception(ex.Message);  
                    }  
                    return ds;  
                }  
            }  
        }  
  
  
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)  
        {  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            if (trans != null)  
                cmd.Transaction = trans;  
            cmd.CommandType = CommandType.Text;//cmdType;  
            if (cmdParms != null)  
            {  
  
  
                foreach (SqlParameter parameter in cmdParms)  
                {  
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&  
                        (parameter.Value == null))  
                    {  
                        parameter.Value = DBNull.Value;  
                    }  
                    cmd.Parameters.Add(parameter);  
                }  
            }  
        }  
 
        #endregion  
 
        #region 存储过程操作  
  
        /// <summary>  
        /// 执行存储过程，返回SqlDataReader  ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>SqlDataReader</returns>  
        public SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                SqlDataReader returnReader;  
                connection.Open();  
                SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);  
                command.CommandType = CommandType.StoredProcedure;  
                returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);  
                return returnReader;  
            }  
        }  
  
  
        /// <summary>  
        /// 执行存储过程  
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <param name="tableName">DataSet结果中的表名</param>  
        /// <returns>DataSet</returns>  
        public DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet dataSet = new DataSet();  
                connection.Open();  
                SqlDataAdapter sqlDA = new SqlDataAdapter();  
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);  
                sqlDA.Fill(dataSet, tableName);  
                connection.Close();  
                return dataSet;  
            }  
        }  
        public DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                DataSet dataSet = new DataSet();  
                connection.Open();  
                SqlDataAdapter sqlDA = new SqlDataAdapter();  
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);  
                sqlDA.SelectCommand.CommandTimeout = Times;  
                sqlDA.Fill(dataSet, tableName);  
                connection.Close();  
                return dataSet;  
            }  
        }  
  
  
        /// <summary>  
        /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)  
        /// </summary>  
        /// <param name="connection">数据库连接</param>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>SqlCommand</returns>  
        private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)  
        {  
            SqlCommand command = new SqlCommand(storedProcName, connection);  
            command.CommandType = CommandType.StoredProcedure;  
            foreach (SqlParameter parameter in parameters)  
            {  
                if (parameter != null)  
                {  
                    // 检查未分配值的输出参数,将其分配以DBNull.Value.  
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&  
                        (parameter.Value == null))  
                    {  
                        parameter.Value = DBNull.Value;  
                    }  
                    command.Parameters.Add(parameter);  
                }  
            }  
  
            return command;  
        }  
  
        /// <summary>  
        /// 执行存储过程，返回影响的行数        
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <param name="rowsAffected">影响的行数</param>  
        /// <returns></returns>  
        public int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)  
        {  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                int result;  
                connection.Open();  
                SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);  
                rowsAffected = command.ExecuteNonQuery();  
                result = (int)command.Parameters["ReturnValue"].Value;  
                //Connection.Close();  
                return result;  
            }  
        }  
  
        /// <summary>  
        /// 创建 SqlCommand 对象实例(用来返回一个整数值)     
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>SqlCommand 对象实例</returns>  
        private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)  
        {  
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);  
            command.Parameters.Add(new SqlParameter("ReturnValue",  
                SqlDbType.Int, 4, ParameterDirection.ReturnValue,  
                false, 0, 0, string.Empty, DataRowVersion.Default, null));  
            return command;  
        }  
        #endregion  
  
    }  
  
}  

DBHelperSQLP （注意：同上）

using System;  
using System.Collections;  
using System.Collections.Specialized;  
using System.Data;  
using System.Configuration;  
using System.Data.SQLite;  
namespace Maticsoft.DBUtility  
{  
    /// <summary>  
    /// 数据访问基础类(基于SQLite)  
    /// 可以用户可以修改满足自己项目的需要。  
    /// </summary>  
    public abstract class DbHelperSQLite  
    {  
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.       
        public static string connectionString = "连接字符串";  
        public DbHelperSQLite()  
        {  
        }  
 
 
        #region 公用方法  
         
        public static int GetMaxID(string FieldName, string TableName)  
        {  
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;  
            object obj = GetSingle(strsql);  
            if (obj == null)  
            {  
                return 1;  
            }  
            else  
            {  
                return int.Parse(obj.ToString());  
            }  
        }  
        public static bool Exists(string strSql)  
        {  
            object obj = GetSingle(strSql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        public static bool Exists(string strSql, params SQLiteParameter[] cmdParms)  
        {  
            object obj = GetSingle(strSql, cmdParms);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
         
        #endregion  
 
        #region  执行简单SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (System.Data.SQLite.SQLiteException E)  
                    {  
                        connection.Close();  
                        throw new Exception(E.Message);  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public static void ExecuteSqlTran(ArrayList SQLStringList)  
        {  
            using (SQLiteConnection conn = new SQLiteConnection(connectionString))  
            {  
                conn.Open();  
                SQLiteCommand cmd = new SQLiteCommand();  
                cmd.Connection = conn;  
                SQLiteTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    for (int n = 0; n < SQLStringList.Count; n++)  
                    {  
                        string strsql = SQLStringList[n].ToString();  
                        if (strsql.Trim().Length > 1)  
                        {  
                            cmd.CommandText = strsql;  
                            cmd.ExecuteNonQuery();  
                        }  
                    }  
                    tx.Commit();  
                }  
                catch (System.Data.SQLite.SQLiteException E)  
                {  
                    tx.Rollback();  
                    throw new Exception(E.Message);  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, string content)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                SQLiteCommand cmd = new SQLiteCommand(SQLString, connection);  
                SQLiteParameter myParameter = new SQLiteParameter("@content", DbType.String);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.SQLite.SQLiteException E)  
                {  
                    throw new Exception(E.Message);  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)  
        /// </summary>  
        /// <param name="strSQL">SQL语句</param>  
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);  
                SQLiteParameter myParameter = new SQLiteParameter("@fs", DbType.Binary);  
                myParameter.Value = fs;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.SQLite.SQLiteException E)  
                {  
                    throw new Exception(E.Message);  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SQLite.SQLiteException e)  
                    {  
                        connection.Close();  
                        throw new Exception(e.Message);  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行查询语句，返回SQLiteDataReader  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>SQLiteDataReader</returns>  
        public static SQLiteDataReader ExecuteReader(string strSQL)  
        {  
            SQLiteConnection connection = new SQLiteConnection(connectionString);  
            SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);  
            try  
            {  
                connection.Open();  
                SQLiteDataReader myReader = cmd.ExecuteReader();  
                return myReader;  
            }  
            catch (System.Data.SQLite.SQLiteException e)  
            {  
                throw new Exception(e.Message);  
            }  
  
        }  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);  
                    command.Fill(ds, "ds");  
                }  
                catch (System.Data.SQLite.SQLiteException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
 
 
        #endregion  
 
        #region 执行带参数的SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, params SQLiteParameter[] cmdParms)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                using (SQLiteCommand cmd = new SQLiteCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        int rows = cmd.ExecuteNonQuery();  
                        cmd.Parameters.Clear();  
                        return rows;  
                    }  
                    catch (System.Data.SQLite.SQLiteException E)  
                    {  
                        throw new Exception(E.Message);  
                    }  
                }  
            }  
        }  
  
  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SQLiteParameter[]）</param>  
        public static void ExecuteSqlTran(Hashtable SQLStringList)  
        {  
            using (SQLiteConnection conn = new SQLiteConnection(connectionString))  
            {  
                conn.Open();  
                using (SQLiteTransaction trans = conn.BeginTransaction())  
                {  
                    SQLiteCommand cmd = new SQLiteCommand();  
                    try  
                    {  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            SQLiteParameter[] cmdParms = (SQLiteParameter[])myDE.Value;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            cmd.Parameters.Clear();  
  
                            trans.Commit();  
                        }  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString, params SQLiteParameter[] cmdParms)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                using (SQLiteCommand cmd = new SQLiteCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        object obj = cmd.ExecuteScalar();  
                        cmd.Parameters.Clear();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.SQLite.SQLiteException e)  
                    {  
                        throw new Exception(e.Message);  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回SQLiteDataReader  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>SQLiteDataReader</returns>  
        public static SQLiteDataReader ExecuteReader(string SQLString, params SQLiteParameter[] cmdParms)  
        {  
            SQLiteConnection connection = new SQLiteConnection(connectionString);  
            SQLiteCommand cmd = new SQLiteCommand();  
            try  
            {  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                SQLiteDataReader myReader = cmd.ExecuteReader();  
                cmd.Parameters.Clear();  
                return myReader;  
            }  
            catch (System.Data.SQLite.SQLiteException e)  
            {  
                throw new Exception(e.Message);  
            }  
  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString, params SQLiteParameter[] cmdParms)  
        {  
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))  
            {  
                SQLiteCommand cmd = new SQLiteCommand();  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                using (SQLiteDataAdapter da = new SQLiteDataAdapter(cmd))  
                {  
                    DataSet ds = new DataSet();  
                    try  
                    {  
                        da.Fill(ds, "ds");  
                        cmd.Parameters.Clear();  
                    }  
                    catch (System.Data.SQLite.SQLiteException ex)  
                    {  
                        throw new Exception(ex.Message);  
                    }  
                    return ds;  
                }  
            }  
        }  
  
  
        private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, SQLiteTransaction trans, string cmdText, SQLiteParameter[] cmdParms)  
        {  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            if (trans != null)  
                cmd.Transaction = trans;  
            cmd.CommandType = CommandType.Text;//cmdType;  
            if (cmdParms != null)  
            {  
                foreach (SQLiteParameter parm in cmdParms)  
                    cmd.Parameters.Add(parm);  
            }  
        }  
 
        #endregion  
  
      
  
    }  
}  

DBHelperSQLite

二、Oracle

using System;  
using System.Collections;  
using System.Collections.Specialized;  
using System.Data;  
using System.Data.OracleClient;  
using System.Configuration;  
  
namespace Maticsoft.DBUtility  
{  
    /// <summary>  
    /// 数据访问基础类(基于Oracle)  
    /// 可以用户可以修改满足自己项目的需要。  
    /// </summary>  
    public abstract class DbHelperOra  
    {  
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.       
        public static string connectionString = "连接字符串";   
        public DbHelperOra()  
        {             
        }  
 
        #region 公用方法  
          
        public static int GetMaxID(string FieldName, string TableName)  
        {  
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;  
            object obj = GetSingle(strsql);  
            if (obj == null)  
            {  
                return 1;  
            }  
            else  
            {  
                return int.Parse(obj.ToString());  
            }  
        }  
        public static bool Exists(string strSql)  
        {  
            object obj = GetSingle(strSql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
  
        public static bool Exists(string strSql, params OracleParameter[] cmdParms)  
        {  
            object obj = GetSingle(strSql, cmdParms);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        
        #endregion  
 
        #region  执行简单SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {                 
                using (OracleCommand cmd = new OracleCommand(SQLString,connection))  
                {  
                    try  
                    {         
                        connection.Open();  
                        int rows=cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch(System.Data.OracleClient.OracleException E)  
                    {                     
                        connection.Close();  
                        throw new Exception(E.Message);  
                    }  
                }                 
            }  
        }  
          
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public static void ExecuteSqlTran(ArrayList SQLStringList)  
        {  
            using (OracleConnection conn = new OracleConnection(connectionString))  
            {  
                conn.Open();  
                OracleCommand cmd = new OracleCommand();  
                cmd.Connection=conn;                  
                OracleTransaction tx=conn.BeginTransaction();             
                cmd.Transaction=tx;               
                try  
                {             
                    for(int n=0;n<SQLStringList.Count;n++)  
                    {  
                        string strsql=SQLStringList[n].ToString();  
                        if (strsql.Trim().Length>1)  
                        {  
                            cmd.CommandText=strsql;  
                            cmd.ExecuteNonQuery();  
                        }  
                    }                                         
                    tx.Commit();                      
                }  
                catch(System.Data.OracleClient.OracleException E)  
                {         
                    tx.Rollback();  
                    throw new Exception(E.Message);  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString,string content)  
        {                 
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                OracleCommand cmd = new OracleCommand(SQLString,connection);  
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar);  
                myParameter.Value = content ;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows=cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch(System.Data.OracleClient.OracleException E)  
                {                 
                    throw new Exception(E.Message);  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }     
            }  
        }         
        /// <summary>  
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)  
        /// </summary>  
        /// <param name="strSQL">SQL语句</param>  
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSqlInsertImg(string strSQL,byte[] fs)  
        {         
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                OracleCommand cmd = new OracleCommand(strSQL,connection);  
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw);  
                myParameter.Value = fs ;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows=cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch(System.Data.OracleClient.OracleException E)  
                {                 
                    throw new Exception(E.Message);  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }                 
            }  
        }  
          
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                using(OracleCommand cmd = new OracleCommand(SQLString,connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        object obj = cmd.ExecuteScalar();  
                        if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))  
                        {                     
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }                 
                    }  
                    catch(System.Data.OracleClient.OracleException e)  
                    {                         
                        connection.Close();  
                        throw new Exception(e.Message);  
                    }     
                }  
            }  
        }  
        /// <summary>  
        /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>OracleDataReader</returns>  
        public static OracleDataReader ExecuteReader(string strSQL)  
        {  
            OracleConnection connection = new OracleConnection(connectionString);             
            OracleCommand cmd = new OracleCommand(strSQL,connection);                 
            try  
            {  
                connection.Open();  
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                return myReader;  
            }  
            catch(System.Data.OracleClient.OracleException e)  
            {                                 
                throw new Exception(e.Message);  
            }             
              
        }         
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    OracleDataAdapter command = new OracleDataAdapter(SQLString,connection);                  
                    command.Fill(ds,"ds");  
                }  
                catch(System.Data.OracleClient.OracleException ex)  
                {                 
                    throw new Exception(ex.Message);  
                }             
                return ds;  
            }             
        }  
 
 
        #endregion  
 
        #region 执行带参数的SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString,params OracleParameter[] cmdParms)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {                 
                using (OracleCommand cmd = new OracleCommand())  
                {  
                    try  
                    {         
                        PrepareCommand(cmd, connection, null,SQLString, cmdParms);  
                        int rows=cmd.ExecuteNonQuery();  
                        cmd.Parameters.Clear();  
                        return rows;  
                    }  
                    catch(System.Data.OracleClient.OracleException E)  
                    {                 
                        throw new Exception(E.Message);  
                    }  
                }                 
            }  
        }  
          
              
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param>  
        public static void ExecuteSqlTran(Hashtable SQLStringList)  
        {             
            using (OracleConnection conn = new OracleConnection(connectionString))  
            {  
                conn.Open();  
                using (OracleTransaction trans = conn.BeginTransaction())   
                {  
                    OracleCommand cmd = new OracleCommand();  
                    try   
                    {  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {     
                            string  cmdText=myDE.Key.ToString();  
                            OracleParameter[] cmdParms=(OracleParameter[])myDE.Value;  
                            PrepareCommand(cmd,conn,trans,cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            cmd.Parameters.Clear();  
  
                            trans.Commit();  
                        }                     
                    }  
                    catch   
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }                 
            }  
        }  
      
                  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString,params OracleParameter[] cmdParms)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                using (OracleCommand cmd = new OracleCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null,SQLString, cmdParms);  
                        object obj = cmd.ExecuteScalar();  
                        cmd.Parameters.Clear();  
                        if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))  
                        {                     
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }                 
                    }  
                    catch(System.Data.OracleClient.OracleException e)  
                    {                 
                        throw new Exception(e.Message);  
                    }                     
                }  
            }  
        }  
          
        /// <summary>  
        /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>OracleDataReader</returns>  
        public static OracleDataReader ExecuteReader(string SQLString,params OracleParameter[] cmdParms)  
        {         
            OracleConnection connection = new OracleConnection(connectionString);  
            OracleCommand cmd = new OracleCommand();                  
            try  
            {  
                PrepareCommand(cmd, connection, null,SQLString, cmdParms);  
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                cmd.Parameters.Clear();  
                return myReader;  
            }  
            catch(System.Data.OracleClient.OracleException e)  
            {                                 
                throw new Exception(e.Message);  
            }                     
              
        }         
          
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString,params OracleParameter[] cmdParms)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                OracleCommand cmd = new OracleCommand();  
                PrepareCommand(cmd, connection, null,SQLString, cmdParms);  
                using( OracleDataAdapter da = new OracleDataAdapter(cmd) )  
                {  
                    DataSet ds = new DataSet();   
                    try  
                    {                                                 
                        da.Fill(ds,"ds");  
                        cmd.Parameters.Clear();  
                    }  
                    catch(System.Data.OracleClient.OracleException ex)  
                    {                 
                        throw new Exception(ex.Message);  
                    }             
                    return ds;  
                }                 
            }             
        }  
  
  
        private static void PrepareCommand(OracleCommand cmd,OracleConnection conn,OracleTransaction trans, string cmdText, OracleParameter[] cmdParms)   
        {  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            if (trans != null)  
                cmd.Transaction = trans;  
            cmd.CommandType = CommandType.Text;//cmdType;  
            if (cmdParms != null)   
            {  
                foreach (OracleParameter parm in cmdParms)  
                    cmd.Parameters.Add(parm);  
            }  
        }  
 
        #endregion  
 
        #region 存储过程操作  
  
        /// <summary>  
        /// 执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )  
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>OracleDataReader</returns>  
        public static OracleDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )  
        {  
            OracleConnection connection = new OracleConnection(connectionString);  
            OracleDataReader returnReader;  
            connection.Open();  
            OracleCommand command = BuildQueryCommand( connection,storedProcName, parameters );  
            command.CommandType = CommandType.StoredProcedure;  
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);                
            return returnReader;              
        }  
          
          
        /// <summary>  
        /// 执行存储过程  
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <param name="tableName">DataSet结果中的表名</param>  
        /// <returns>DataSet</returns>  
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                DataSet dataSet = new DataSet();  
                connection.Open();  
                OracleDataAdapter sqlDA = new OracleDataAdapter();  
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );  
                sqlDA.Fill( dataSet, tableName );  
                connection.Close();  
                return dataSet;  
            }  
        }  
  
          
        /// <summary>  
        /// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值)  
        /// </summary>  
        /// <param name="connection">数据库连接</param>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>OracleCommand</returns>  
        private static OracleCommand BuildQueryCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)  
        {             
            OracleCommand command = new OracleCommand( storedProcName, connection );  
            command.CommandType = CommandType.StoredProcedure;  
            foreach (OracleParameter parameter in parameters)  
            {  
                command.Parameters.Add( parameter );  
            }  
            return command;           
        }  
          
        /// <summary>  
        /// 执行存储过程，返回影响的行数        
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <param name="rowsAffected">影响的行数</param>  
        /// <returns></returns>  
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                int result;  
                connection.Open();  
                OracleCommand command = BuildIntCommand(connection,storedProcName, parameters );  
                rowsAffected = command.ExecuteNonQuery();  
                result = (int)command.Parameters["ReturnValue"].Value;  
                //Connection.Close();  
                return result;  
            }  
        }  
          
        /// <summary>  
        /// 创建 OracleCommand 对象实例(用来返回一个整数值)      
        /// </summary>  
        /// <param name="storedProcName">存储过程名</param>  
        /// <param name="parameters">存储过程参数</param>  
        /// <returns>OracleCommand 对象实例</returns>  
        private static OracleCommand BuildIntCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)  
        {  
            OracleCommand command = BuildQueryCommand(connection,storedProcName, parameters );  
            command.Parameters.Add( new OracleParameter ( "ReturnValue",  
                OracleType.Int32, 4, ParameterDirection.ReturnValue,  
                false,0,0,string.Empty,DataRowVersion.Default,null ));  
            return command;  
        }  
        #endregion    
  
    }  
}  

DBHelperOra （注意：注意类库引用）

using System;  
using System.Configuration;  
using System.Data;  
using System.Data.OracleClient;  
using System.Collections;  
using System.Collections.Generic;  
  
namespace Maticsoft.DBUtility  
{  
  
    /// <summary>  
    /// A helper class used to execute queries against an Oracle database  
    /// </summary>  
    public abstract class OracleHelper  
    {  
  
        // Read the connection strings from the configuration file  
        public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.AppSettings["OraConnString1"];  
        public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.AppSettings["OraConnString2"];  
        public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.AppSettings["OraConnString3"];  
        public static readonly string ConnectionStringProfile = ConfigurationManager.AppSettings["OraProfileConnString"];  
        public static readonly string ConnectionStringMembership = ConfigurationManager.AppSettings["OraMembershipConnString"];  
  
        //Create a hashtable for the parameter cached  
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());  
  
        /// <summary>  
        /// Execute a database query which does not include a select  
        /// </summary>  
        /// <param name="connString">Connection string to database</param>  
        /// <param name="cmdType">Command type either stored procedure or SQL</param>  
        /// <param name="cmdText">Acutall SQL Command</param>  
        /// <param name="commandParameters">Parameters to bind to the command</param>  
        /// <returns></returns>  
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)  
        {  
            // Create a new Oracle command  
            OracleCommand cmd = new OracleCommand();  
  
            //Create a connection  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
  
                //Prepare the command  
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);  
  
                //Execute the command  
                int val = cmd.ExecuteNonQuery();  
                connection.Close();  
                cmd.Parameters.Clear();  
                return val;  
            }  
        }  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string connectionString, string SQLString)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    OracleDataAdapter command = new OracleDataAdapter(SQLString, connection);  
                    command.Fill(ds, "ds");  
                }  
                catch (OracleException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                finally  
                {  
                    if (connection.State != ConnectionState.Closed)  
                    {  
                        connection.Close();  
                    }  
                }  
                return ds;  
            }  
        }  
  
        public static DataSet Query(string connectionString, string SQLString, params OracleParameter[] cmdParms)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                OracleCommand cmd = new OracleCommand();  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                using (OracleDataAdapter da = new OracleDataAdapter(cmd))  
                {  
                    DataSet ds = new DataSet();  
                    try  
                    {  
                        da.Fill(ds, "ds");  
                        cmd.Parameters.Clear();  
                    }  
                    catch (System.Data.OracleClient.OracleException ex)  
                    {  
                        throw new Exception(ex.Message);  
                    }  
                    finally  
                    {  
                        if (connection.State != ConnectionState.Closed)  
                        {  
                            connection.Close();  
                        }  
                    }  
                    return ds;  
                }  
            }  
        }  
  
        private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, string cmdText, OracleParameter[] cmdParms)  
        {  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            if (trans != null)  
                cmd.Transaction = trans;  
            cmd.CommandType = CommandType.Text;//cmdType;  
            if (cmdParms != null)  
            {  
                foreach (OracleParameter parameter in cmdParms)  
                {  
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&  
                        (parameter.Value == null))  
                    {  
                        parameter.Value = DBNull.Value;  
                    }  
                    cmd.Parameters.Add(parameter);  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string connectionString, string SQLString)  
        {  
            using (OracleConnection connection = new OracleConnection(connectionString))  
            {  
                using (OracleCommand cmd = new OracleCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (OracleException ex)  
                    {  
                        throw new Exception(ex.Message);  
                    }  
                    finally  
                    {  
                        if (connection.State != ConnectionState.Closed)  
                        {  
                            connection.Close();  
                        }  
                    }  
                }  
            }  
        }  
  
        public static bool Exists(string connectionString,string strOracle)  
        {  
            object obj = OracleHelper.GetSingle(connectionString,strOracle);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
  
        /// <summary>  
        /// Execute an OracleCommand (that returns no resultset) against an existing database transaction   
        /// using the provided parameters.  
        /// </summary>  
        /// <remarks>  
        /// e.g.:    
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));  
        /// </remarks>  
        /// <param name="trans">an existing database transaction</param>  
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>  
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>  
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>  
        /// <returns>an int representing the number of rows affected by the command</returns>  
        public static int ExecuteNonQuery(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)  
        {  
            OracleCommand cmd = new OracleCommand();  
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);  
            int val = cmd.ExecuteNonQuery();  
            cmd.Parameters.Clear();  
            return val;  
        }  
  
        /// <summary>  
        /// Execute an OracleCommand (that returns no resultset) against an existing database connection   
        /// using the provided parameters.  
        /// </summary>  
        /// <remarks>  
        /// e.g.:    
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));  
        /// </remarks>  
        /// <param name="conn">an existing database connection</param>  
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>  
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>  
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>  
        /// <returns>an int representing the number of rows affected by the command</returns>  
        public static int ExecuteNonQuery(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)  
        {  
  
            OracleCommand cmd = new OracleCommand();  
  
            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);  
            int val = cmd.ExecuteNonQuery();  
            cmd.Parameters.Clear();  
            return val;  
        }  
        /// <summary>  
        /// Execute an OracleCommand (that returns no resultset) against an existing database connection   
        /// using the provided parameters.  
        /// </summary>  
        /// <remarks>  
        /// e.g.:    
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));  
        /// </remarks>  
        /// <param name="conn">an existing database connection</param>  
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>  
        /// <returns>an int representing the number of rows affected by the command</returns>  
        public static int ExecuteNonQuery(string connectionString, string cmdText)  
        {  
  
            OracleCommand cmd = new OracleCommand();  
            OracleConnection connection = new OracleConnection(connectionString);  
            PrepareCommand(cmd, connection, null, CommandType.Text, cmdText, null);  
            int val = cmd.ExecuteNonQuery();  
            cmd.Parameters.Clear();  
            return val;  
        }  
  
        /// <summary>  
        /// Execute a select query that will return a result set  
        /// </summary>  
        /// <param name="connString">Connection string</param>  
        //// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>  
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>  
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>  
        /// <returns></returns>  
        public static OracleDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)  
        {              
            OracleCommand cmd = new OracleCommand();  
            OracleConnection conn = new OracleConnection(connectionString);  
            try  
            {  
                //Prepare the command to execute  
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);                  
                OracleDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                cmd.Parameters.Clear();  
                return rdr;  
            }  
            catch  
            {  
                conn.Close();  
                throw;  
            }  
        }  
  
        /// <summary>  
        /// Execute an OracleCommand that returns the first column of the first record against the database specified in the connection string   
        /// using the provided parameters.  
        /// </summary>  
        /// <remarks>  
        /// e.g.:    
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));  
        /// </remarks>  
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>  
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>  
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>  
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>  
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>  
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)  
        {  
            OracleCommand cmd = new OracleCommand();  
  
            using (OracleConnection conn = new OracleConnection(connectionString))  
            {  
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);  
                object val = cmd.ExecuteScalar();  
                cmd.Parameters.Clear();  
                return val;  
            }  
        }  
  
        /// <summary>  
        /// Execute a OracleCommand (that returns a 1x1 resultset)  against the specified SqlTransaction  
        /// using the provided parameters.  
        /// </summary>  
        /// <param name="transaction">A   valid SqlTransaction</param>  
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>  
        /// <param name="commandText">The stored procedure name   or PL/SQL command</param>  
        /// <param name="commandParameters">An array of   OracleParamters used to execute the command</param>  
        /// <returns>An   object containing the value in the 1x1 resultset generated by the command</returns>  
        public static object ExecuteScalar(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)  
        {  
            if (transaction == null)  
                throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null)  
                throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
  
            // Create a command and prepare it for execution  
            OracleCommand cmd = new OracleCommand();  
  
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);  
  
            // Execute the command & return the results  
            object retval = cmd.ExecuteScalar();  
  
            // Detach the SqlParameters from the command object, so they can be used again  
            cmd.Parameters.Clear();  
            return retval;  
        }  
  
        /// <summary>  
        /// Execute an OracleCommand that returns the first column of the first record against an existing database connection   
        /// using the provided parameters.  
        /// </summary>  
        /// <remarks>  
        /// e.g.:    
        ///  Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));  
        /// </remarks>  
        /// <param name="conn">an existing database connection</param>  
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>  
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>  
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>  
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>  
        public static object ExecuteScalar(OracleConnection connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)  
        {  
            OracleCommand cmd = new OracleCommand();  
  
            PrepareCommand(cmd, connectionString, null, cmdType, cmdText, commandParameters);  
            object val = cmd.ExecuteScalar();  
            cmd.Parameters.Clear();  
            return val;  
        }  
  
        /// <summary>  
        /// Add a set of parameters to the cached  
        /// </summary>  
        /// <param name="cacheKey">Key value to look up the parameters</param>  
        /// <param name="commandParameters">Actual parameters to cached</param>  
        public static void CacheParameters(string cacheKey, params OracleParameter[] commandParameters)  
        {  
            parmCache[cacheKey] = commandParameters;  
        }  
  
        /// <summary>  
        /// Fetch parameters from the cache  
        /// </summary>  
        /// <param name="cacheKey">Key to look up the parameters</param>  
        /// <returns></returns>  
        public static OracleParameter[] GetCachedParameters(string cacheKey)  
        {  
            OracleParameter[] cachedParms = (OracleParameter[])parmCache[cacheKey];  
  
            if (cachedParms == null)  
                return null;  
  
            // If the parameters are in the cache  
            OracleParameter[] clonedParms = new OracleParameter[cachedParms.Length];  
  
            // return a copy of the parameters  
            for (int i = 0, j = cachedParms.Length; i < j; i++)  
                clonedParms[i] = (OracleParameter)((ICloneable)cachedParms[i]).Clone();  
  
            return clonedParms;  
        }         
        /// <summary>  
        /// Internal function to prepare a command for execution by the database  
        /// </summary>  
        /// <param name="cmd">Existing command object</param>  
        /// <param name="conn">Database connection object</param>  
        /// <param name="trans">Optional transaction object</param>  
        /// <param name="cmdType">Command type, e.g. stored procedure</param>  
        /// <param name="cmdText">Command test</param>  
        /// <param name="commandParameters">Parameters for the command</param>  
        private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, CommandType cmdType, string cmdText, OracleParameter[] commandParameters)  
        {  
  
            //Open the connection if required  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
  
            //Set up the command  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            cmd.CommandType = cmdType;  
  
            //Bind it to the transaction if it exists  
            if (trans != null)  
                cmd.Transaction = trans;  
  
            // Bind the parameters passed in  
            if (commandParameters != null)  
            {  
                foreach (OracleParameter parm in commandParameters)  
                    cmd.Parameters.Add(parm);  
            }  
        }  
  
        /// <summary>  
        /// Converter to use boolean data type with Oracle  
        /// </summary>  
        /// <param name="value">Value to convert</param>  
        /// <returns></returns>  
        public static string OraBit(bool value)  
        {  
            if (value)  
                return "Y";  
            else  
                return "N";  
        }  
  
        /// <summary>  
        /// Converter to use boolean data type with Oracle  
        /// </summary>  
        /// <param name="value">Value to convert</param>  
        /// <returns></returns>  
        public static bool OraBool(string value)  
        {  
            if (value.Equals("Y"))  
                return true;  
            else  
                return false;  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public static bool ExecuteSqlTran(string conStr, List<CommandInfo> cmdList)  
        {  
            using (OracleConnection conn = new OracleConnection(conStr))  
            {  
                conn.Open();  
                OracleCommand cmd = new OracleCommand();  
                cmd.Connection = conn;  
                OracleTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    foreach (CommandInfo c in cmdList)  
                    {  
                        if (!String.IsNullOrEmpty(c.CommandText))  
                        {  
                            PrepareCommand(cmd, conn, tx, CommandType.Text, c.CommandText, (OracleParameter[])c.Parameters);  
                            if (c.EffentNextType == EffentNextType.WhenHaveContine || c.EffentNextType == EffentNextType.WhenNoHaveContine)  
                            {  
                                if (c.CommandText.ToLower().IndexOf("count(") == -1)  
                                {  
                                    tx.Rollback();  
                                    throw new Exception("Oracle:违背要求" + c.CommandText + "必须符合select count(..的格式");  
                                    //return false;  
                                }  
  
                                object obj = cmd.ExecuteScalar();  
                                bool isHave = false;  
                                if (obj == null && obj == DBNull.Value)  
                                {  
                                    isHave = false;  
                                }  
                                isHave = Convert.ToInt32(obj) > 0;  
  
                                if (c.EffentNextType == EffentNextType.WhenHaveContine && !isHave)  
                                {  
                                    tx.Rollback();  
                                    throw new Exception("Oracle:违背要求" + c.CommandText + "返回值必须大于0");  
                                    //return false;  
                                }  
                                if (c.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)  
                                {  
                                    tx.Rollback();  
                                    throw new Exception("Oracle:违背要求" + c.CommandText + "返回值必须等于0");  
                                    //eturn false;  
                                }  
                                continue;  
                            }  
                            int res = cmd.ExecuteNonQuery();  
                            if (c.EffentNextType == EffentNextType.ExcuteEffectRows && res == 0)  
                            {  
                                tx.Rollback();  
                                throw new Exception("Oracle:违背要求" + c.CommandText + "必须有影像行");  
                                // return false;  
                            }  
                        }  
                    }  
                    tx.Commit();  
                    return true;  
                }  
                catch (System.Data.OracleClient.OracleException E)  
                {  
                    tx.Rollback();  
                    throw E;  
                }  
                finally  
                {  
                    if (conn.State != ConnectionState.Closed)  
                    {  
                        conn.Close();  
                    }  
                }  
            }  
        }         
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public static void ExecuteSqlTran(string conStr,List<String> SQLStringList)  
        {  
            using (OracleConnection conn = new OracleConnection(conStr))  
            {  
                conn.Open();  
                OracleCommand cmd = new OracleCommand();  
                cmd.Connection = conn;  
                OracleTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    foreach (string sql in SQLStringList)  
                    {  
                        if (!String.IsNullOrEmpty(sql))  
                        {  
                            cmd.CommandText = sql;  
                            cmd.ExecuteNonQuery();  
                        }  
                    }  
                    tx.Commit();  
                }  
                catch (System.Data.OracleClient.OracleException E)  
                {  
                    tx.Rollback();  
                    throw new Exception(E.Message);  
                }  
                finally  
                {  
                    if (conn.State != ConnectionState.Closed)  
                        {  
                            conn.Close();  
                        }  
                }  
            }  
        }         
    }  
}  

OracleHelper

三、MySql

using System;  
using System.Collections;  
using System.Collections.Specialized;  
using System.Data;  
using MySql.Data.MySqlClient;  
using System.Configuration;  
using System.Data.Common;  
using System.Collections.Generic;  
namespace Maticsoft.DBUtility  
{  
    /// <summary>  
    /// 数据访问抽象基础类  
    /// </summary>  
    public abstract class DbHelperMySQL  
    {  
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.       
        public static string connectionString = "连接字符串";  
        public DbHelperMySQL()  
        {              
        }  
 
        #region 公用方法  
        /// <summary>  
        /// 得到最大值  
        /// </summary>  
        /// <param name="FieldName"></param>  
        /// <param name="TableName"></param>  
        /// <returns></returns>  
        public static int GetMaxID(string FieldName, string TableName)  
        {  
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;  
            object obj = GetSingle(strsql);  
            if (obj == null)  
            {  
                return 1;  
            }  
            else  
            {  
                return int.Parse(obj.ToString());  
            }  
        }  
        /// <summary>  
        /// 是否存在  
        /// </summary>  
        /// <param name="strSql"></param>  
        /// <returns></returns>  
        public static bool Exists(string strSql)  
        {  
            object obj = GetSingle(strSql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }      
        /// <summary>  
        /// 是否存在（基于MySqlParameter）  
        /// </summary>  
        /// <param name="strSql"></param>  
        /// <param name="cmdParms"></param>  
        /// <returns></returns>  
        public static bool Exists(string strSql, params MySqlParameter[] cmdParms)  
        {  
            object obj = GetSingle(strSql, cmdParms);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        #endregion  
 
        #region  执行简单SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (MySql.Data.MySqlClient.MySqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
  
        public static int ExecuteSqlByTime(string SQLString, int Times)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        cmd.CommandTimeout = Times;  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (MySql.Data.MySqlClient.MySqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        
        /// <summary>  
        /// 执行MySql和Oracle滴混合事务  
        /// </summary>  
        /// <param name="list">SQL命令行列表</param>  
        /// <param name="oracleCmdSqlList">Oracle命令行列表</param>  
        /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>  
        public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)  
        {  
            using (MySqlConnection conn = new MySqlConnection(connectionString))  
            {  
                conn.Open();  
                MySqlCommand cmd = new MySqlCommand();  
                cmd.Connection = conn;  
                MySqlTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    foreach (CommandInfo myDE in list)  
                    {  
                        string cmdText = myDE.CommandText;  
                        MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;  
                        PrepareCommand(cmd, conn, tx, cmdText, cmdParms);  
                        if (myDE.EffentNextType == EffentNextType.SolicitationEvent)  
                        {  
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                            {  
                                tx.Rollback();  
                                throw new Exception("违背要求"+myDE.CommandText+"必须符合select count(..的格式");  
                                //return 0;  
                            }  
  
                            object obj = cmd.ExecuteScalar();  
                            bool isHave = false;  
                            if (obj == null && obj == DBNull.Value)  
                            {  
                                isHave = false;  
                            }  
                            isHave = Convert.ToInt32(obj) > 0;  
                            if (isHave)  
                            {  
                                //引发事件  
                                myDE.OnSolicitationEvent();  
                            }  
                        }  
                        if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)  
                        {  
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");  
                                //return 0;  
                            }  
  
                            object obj = cmd.ExecuteScalar();  
                            bool isHave = false;  
                            if (obj == null && obj == DBNull.Value)  
                            {  
                                isHave = false;  
                            }  
                            isHave = Convert.ToInt32(obj) > 0;  
  
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");  
                                //return 0;  
                            }  
                            if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)  
                            {  
                                tx.Rollback();  
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");  
                                //return 0;  
                            }  
                            continue;  
                        }  
                        int val = cmd.ExecuteNonQuery();  
                        if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)  
                        {  
                            tx.Rollback();  
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");  
                            //return 0;  
                        }  
                        cmd.Parameters.Clear();  
                    }  
                    string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");  
                    bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);  
                    if (!res)  
                    {  
                        tx.Rollback();  
                        throw new Exception("执行失败");  
                        // return -1;  
                    }  
                    tx.Commit();  
                    return 1;  
                }  
                catch (MySql.Data.MySqlClient.MySqlException e)  
                {  
                    tx.Rollback();  
                    throw e;  
                }  
                catch (Exception e)  
                {  
                    tx.Rollback();  
                    throw e;  
                }  
            }  
        }          
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public static int ExecuteSqlTran(List<String> SQLStringList)  
        {  
            using (MySqlConnection conn = new MySqlConnection(connectionString))  
            {  
                conn.Open();  
                MySqlCommand cmd = new MySqlCommand();  
                cmd.Connection = conn;  
                MySqlTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    int count = 0;  
                    for (int n = 0; n < SQLStringList.Count; n++)  
                    {  
                        string strsql = SQLStringList[n];  
                        if (strsql.Trim().Length > 1)  
                        {  
                            cmd.CommandText = strsql;  
                            count += cmd.ExecuteNonQuery();  
                        }  
                    }  
                    tx.Commit();  
                    return count;  
                }  
                catch  
                {  
                    tx.Rollback();  
                    return 0;  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, string content)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                MySqlCommand cmd = new MySqlCommand(SQLString, connection);  
                MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@content", SqlDbType.NText);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (MySql.Data.MySqlClient.MySqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public static object ExecuteSqlGet(string SQLString, string content)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                MySqlCommand cmd = new MySqlCommand(SQLString, connection);  
                MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@content", SqlDbType.NText);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    object obj = cmd.ExecuteScalar();  
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                    {  
                        return null;  
                    }  
                    else  
                    {  
                        return obj;  
                    }  
                }  
                catch (MySql.Data.MySqlClient.MySqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)  
        /// </summary>  
        /// <param name="strSQL">SQL语句</param>  
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                MySqlCommand cmd = new MySqlCommand(strSQL, connection);  
                MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@fs", SqlDbType.Image);  
                myParameter.Value = fs;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (MySql.Data.MySqlClient.MySqlException e)  
                {  
                    throw e;  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (MySql.Data.MySqlClient.MySqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        public static object GetSingle(string SQLString, int Times)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        cmd.CommandTimeout = Times;  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (MySql.Data.MySqlClient.MySqlException e)  
                    {  
                        connection.Close();  
                        throw e;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>MySqlDataReader</returns>  
        public static MySqlDataReader ExecuteReader(string strSQL)  
        {  
            MySqlConnection connection = new MySqlConnection(connectionString);  
            MySqlCommand cmd = new MySqlCommand(strSQL, connection);  
            try  
            {  
                connection.Open();  
                MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                return myReader;  
            }  
            catch (MySql.Data.MySqlClient.MySqlException e)  
            {  
                throw e;  
            }     
  
        }  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);  
                    command.Fill(ds, "ds");  
                }  
                catch (MySql.Data.MySqlClient.MySqlException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
        public static DataSet Query(string SQLString, int Times)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);  
                    command.SelectCommand.CommandTimeout = Times;  
                    command.Fill(ds, "ds");  
                }  
                catch (MySql.Data.MySqlClient.MySqlException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
 
 
 
        #endregion  
 
        #region 执行带参数的SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, params MySqlParameter[] cmdParms)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                using (MySqlCommand cmd = new MySqlCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        int rows = cmd.ExecuteNonQuery();  
                        cmd.Parameters.Clear();  
                        return rows;  
                    }  
                    catch (MySql.Data.MySqlClient.MySqlException e)  
                    {  
                        throw e;  
                    }  
                }  
            }  
        }  
  
  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>  
        public static void ExecuteSqlTran(Hashtable SQLStringList)  
        {  
            using (MySqlConnection conn = new MySqlConnection(connectionString))  
            {  
                conn.Open();  
                using (MySqlTransaction trans = conn.BeginTransaction())  
                {  
                    MySqlCommand cmd = new MySqlCommand();  
                    try  
                    {  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Value;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>  
        public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)  
        {  
            using (MySqlConnection conn = new MySqlConnection(connectionString))  
            {  
                conn.Open();  
                using (MySqlTransaction trans = conn.BeginTransaction())  
                {  
                    MySqlCommand cmd = new MySqlCommand();  
                    try  
                    { int count = 0;  
                        //循环  
                        foreach (CommandInfo myDE in cmdList)  
                        {  
                            string cmdText = myDE.CommandText;  
                            MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                             
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)  
                            {  
                                if (myDE.CommandText.ToLower().IndexOf("count(") == -1)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
  
                                object obj = cmd.ExecuteScalar();  
                                bool isHave = false;  
                                if (obj == null && obj == DBNull.Value)  
                                {  
                                    isHave = false;  
                                }  
                                isHave = Convert.ToInt32(obj) > 0;  
  
                                if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
                                if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)  
                                {  
                                    trans.Rollback();  
                                    return 0;  
                                }  
                                continue;  
                            }  
                            int val = cmd.ExecuteNonQuery();  
                            count += val;  
                            if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)  
                            {  
                                trans.Rollback();  
                                return 0;  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                        return count;  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>  
        public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)  
        {  
            using (MySqlConnection conn = new MySqlConnection(connectionString))  
            {  
                conn.Open();  
                using (MySqlTransaction trans = conn.BeginTransaction())  
                {  
                    MySqlCommand cmd = new MySqlCommand();  
                    try  
                    {  
                        int indentity = 0;  
                        //循环  
                        foreach (CommandInfo myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.CommandText;  
                            MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;  
                            foreach (MySqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.InputOutput)  
                                {  
                                    q.Value = indentity;  
                                }  
                            }  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            foreach (MySqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.Output)  
                                {  
                                    indentity = Convert.ToInt32(q.Value);  
                                }  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>  
        public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)  
        {  
            using (MySqlConnection conn = new MySqlConnection(connectionString))  
            {  
                conn.Open();  
                using (MySqlTransaction trans = conn.BeginTransaction())  
                {  
                    MySqlCommand cmd = new MySqlCommand();  
                    try  
                    {  
                        int indentity = 0;  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Value;  
                            foreach (MySqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.InputOutput)  
                                {  
                                    q.Value = indentity;  
                                }  
                            }  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            foreach (MySqlParameter q in cmdParms)  
                            {  
                                if (q.Direction == ParameterDirection.Output)  
                                {  
                                    indentity = Convert.ToInt32(q.Value);  
                                }  
                            }  
                            cmd.Parameters.Clear();  
                        }  
                        trans.Commit();  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString, params MySqlParameter[] cmdParms)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                using (MySqlCommand cmd = new MySqlCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        object obj = cmd.ExecuteScalar();  
                        cmd.Parameters.Clear();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (MySql.Data.MySqlClient.MySqlException e)  
                    {  
                        throw e;  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close )  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>MySqlDataReader</returns>  
        public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms)  
        {  
            MySqlConnection connection = new MySqlConnection(connectionString);  
            MySqlCommand cmd = new MySqlCommand();  
            try  
            {  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                cmd.Parameters.Clear();  
                return myReader;  
            }  
            catch (MySql.Data.MySqlClient.MySqlException e)  
            {  
                throw e;  
            }  
            //          finally  
            //          {  
            //              cmd.Dispose();  
            //              connection.Close();  
            //          }     
  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString, params MySqlParameter[] cmdParms)  
        {  
            using (MySqlConnection connection = new MySqlConnection(connectionString))  
            {  
                MySqlCommand cmd = new MySqlCommand();  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))  
                {  
                    DataSet ds = new DataSet();  
                    try  
                    {  
                        da.Fill(ds, "ds");  
                        cmd.Parameters.Clear();  
                    }  
                    catch (MySql.Data.MySqlClient.MySqlException ex)  
                    {  
                        throw new Exception(ex.Message);  
                    }  
                    return ds;  
                }  
            }  
        }  
  
  
        private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] cmdParms)  
        {  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            if (trans != null)  
                cmd.Transaction = trans;  
            cmd.CommandType = CommandType.Text;//cmdType;  
            if (cmdParms != null)  
            {  
  
  
                foreach (MySqlParameter parameter in cmdParms)  
                {  
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&  
                        (parameter.Value == null))  
                    {  
                        parameter.Value = DBNull.Value;  
                    }  
                    cmd.Parameters.Add(parameter);  
                }  
            }  
        }  
 
        #endregion  
  
          
  
    }  
  
}  

DBHelperMySQL （注意：注意类库引用）

四、其他

using System;  
using System.Collections;  
using System.Collections.Specialized;  
using System.Data;  
using System.Data.OleDb;  
using System.Configuration;  
  
namespace Maticsoft.DBUtility  
{  
    /// <summary>  
    /// 数据访问基础类(基于OleDb)   
    /// 可以用户可以修改满足自己项目的需要。  
    /// </summary>  
    public abstract class DbHelperOleDb  
    {  
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.       
        public static string connectionString = "连接字符串";  
        public DbHelperOleDb()  
        {  
        }  
 
        #region 公用方法  
  
        public static int GetMaxID(string FieldName, string TableName)  
        {  
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;  
            object obj = DbHelperSQL.GetSingle(strsql);  
            if (obj == null)  
            {  
                return 1;  
            }  
            else  
            {  
                return int.Parse(obj.ToString());  
            }  
        }  
        public static bool Exists(string strSql)  
        {  
            object obj = DbHelperSQL.GetSingle(strSql);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
        public static bool Exists(string strSql, params OleDbParameter[] cmdParms)  
        {  
            object obj = GetSingle(strSql, cmdParms);  
            int cmdresult;  
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
            {  
                cmdresult = 0;  
            }  
            else  
            {  
                cmdresult = int.Parse(obj.ToString());  
            }  
            if (cmdresult == 0)  
            {  
                return false;  
            }  
            else  
            {  
                return true;  
            }  
        }  
 
        #endregion  
 
        #region  执行简单SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        int rows = cmd.ExecuteNonQuery();  
                        return rows;  
                    }  
                    catch (System.Data.OleDb.OleDbException E)  
                    {  
                        connection.Close();  
                        throw new Exception(E.Message);  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">多条SQL语句</param>       
        public static void ExecuteSqlTran(ArrayList SQLStringList)  
        {  
            using (OleDbConnection conn = new OleDbConnection(connectionString))  
            {  
                conn.Open();  
                OleDbCommand cmd = new OleDbCommand();  
                cmd.Connection = conn;  
                OleDbTransaction tx = conn.BeginTransaction();  
                cmd.Transaction = tx;  
                try  
                {  
                    for (int n = 0; n < SQLStringList.Count; n++)  
                    {  
                        string strsql = SQLStringList[n].ToString();  
                        if (strsql.Trim().Length > 1)  
                        {  
                            cmd.CommandText = strsql;  
                            cmd.ExecuteNonQuery();  
                        }  
                    }  
                    tx.Commit();  
                }  
                catch (System.Data.OleDb.OleDbException E)  
                {  
                    tx.Rollback();  
                    throw new Exception(E.Message);  
                }  
            }  
        }  
        /// <summary>  
        /// 执行带一个存储过程参数的的SQL语句。  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, string content)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                OleDbCommand cmd = new OleDbCommand(SQLString, connection);  
                System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@content", OleDbType.VarChar);  
                myParameter.Value = content;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.OleDb.OleDbException E)  
                {  
                    throw new Exception(E.Message);  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
        /// <summary>  
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)  
        /// </summary>  
        /// <param name="strSQL">SQL语句</param>  
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                OleDbCommand cmd = new OleDbCommand(strSQL, connection);  
                System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@fs", OleDbType.Binary);  
                myParameter.Value = fs;  
                cmd.Parameters.Add(myParameter);  
                try  
                {  
                    connection.Open();  
                    int rows = cmd.ExecuteNonQuery();  
                    return rows;  
                }  
                catch (System.Data.OleDb.OleDbException E)  
                {  
                    throw new Exception(E.Message);  
                }  
                finally  
                {  
                    cmd.Dispose();  
                    connection.Close();  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))  
                {  
                    try  
                    {  
                        connection.Open();  
                        object obj = cmd.ExecuteScalar();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.OleDb.OleDbException e)  
                    {  
                        connection.Close();  
                        throw new Exception(e.Message);  
                    }  
                }  
            }  
        }  
        /// <summary>  
        /// 执行查询语句，返回OleDbDataReader  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>OleDbDataReader</returns>  
        public static OleDbDataReader ExecuteReader(string strSQL)  
        {  
            OleDbConnection connection = new OleDbConnection(connectionString);  
            OleDbCommand cmd = new OleDbCommand(strSQL, connection);  
            try  
            {  
                connection.Open();  
                OleDbDataReader myReader = cmd.ExecuteReader();  
                return myReader;  
            }  
            catch (System.Data.OleDb.OleDbException e)  
            {  
                throw new Exception(e.Message);  
            }  
  
        }  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                DataSet ds = new DataSet();  
                try  
                {  
                    connection.Open();  
                    OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);  
                    command.Fill(ds, "ds");  
                }  
                catch (System.Data.OleDb.OleDbException ex)  
                {  
                    throw new Exception(ex.Message);  
                }  
                return ds;  
            }  
        }  
 
 
        #endregion  
 
        #region 执行带参数的SQL语句  
  
        /// <summary>  
        /// 执行SQL语句，返回影响的记录数  
        /// </summary>  
        /// <param name="SQLString">SQL语句</param>  
        /// <returns>影响的记录数</returns>  
        public static int ExecuteSql(string SQLString, params OleDbParameter[] cmdParms)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                using (OleDbCommand cmd = new OleDbCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        int rows = cmd.ExecuteNonQuery();  
                        cmd.Parameters.Clear();  
                        return rows;  
                    }  
                    catch (System.Data.OleDb.OleDbException E)  
                    {  
                        throw new Exception(E.Message);  
                    }  
                }  
            }  
        }  
  
  
        /// <summary>  
        /// 执行多条SQL语句，实现数据库事务。  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OleDbParameter[]）</param>  
        public static void ExecuteSqlTran(Hashtable SQLStringList)  
        {  
            using (OleDbConnection conn = new OleDbConnection(connectionString))  
            {  
                conn.Open();  
                using (OleDbTransaction trans = conn.BeginTransaction())  
                {  
                    OleDbCommand cmd = new OleDbCommand();  
                    try  
                    {  
                        //循环  
                        foreach (DictionaryEntry myDE in SQLStringList)  
                        {  
                            string cmdText = myDE.Key.ToString();  
                            OleDbParameter[] cmdParms = (OleDbParameter[])myDE.Value;  
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);  
                            int val = cmd.ExecuteNonQuery();  
                            cmd.Parameters.Clear();  
  
                            trans.Commit();  
                        }  
                    }  
                    catch  
                    {  
                        trans.Rollback();  
                        throw;  
                    }  
                }  
            }  
        }  
  
  
        /// <summary>  
        /// 执行一条计算查询结果语句，返回查询结果（object）。  
        /// </summary>  
        /// <param name="SQLString">计算查询结果语句</param>  
        /// <returns>查询结果（object）</returns>  
        public static object GetSingle(string SQLString, params OleDbParameter[] cmdParms)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                using (OleDbCommand cmd = new OleDbCommand())  
                {  
                    try  
                    {  
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                        object obj = cmd.ExecuteScalar();  
                        cmd.Parameters.Clear();  
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  
                        {  
                            return null;  
                        }  
                        else  
                        {  
                            return obj;  
                        }  
                    }  
                    catch (System.Data.OleDb.OleDbException e)  
                    {  
                        throw new Exception(e.Message);  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回OleDbDataReader  
        /// </summary>  
        /// <param name="strSQL">查询语句</param>  
        /// <returns>OleDbDataReader</returns>  
        public static OleDbDataReader ExecuteReader(string SQLString, params OleDbParameter[] cmdParms)  
        {  
            OleDbConnection connection = new OleDbConnection(connectionString);  
            OleDbCommand cmd = new OleDbCommand();  
            try  
            {  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                OleDbDataReader myReader = cmd.ExecuteReader();  
                cmd.Parameters.Clear();  
                return myReader;  
            }  
            catch (System.Data.OleDb.OleDbException e)  
            {  
                throw new Exception(e.Message);  
            }  
  
        }  
  
        /// <summary>  
        /// 执行查询语句，返回DataSet  
        /// </summary>  
        /// <param name="SQLString">查询语句</param>  
        /// <returns>DataSet</returns>  
        public static DataSet Query(string SQLString, params OleDbParameter[] cmdParms)  
        {  
            using (OleDbConnection connection = new OleDbConnection(connectionString))  
            {  
                OleDbCommand cmd = new OleDbCommand();  
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);  
                using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))  
                {  
                    DataSet ds = new DataSet();  
                    try  
                    {  
                        da.Fill(ds, "ds");  
                        cmd.Parameters.Clear();  
                    }  
                    catch (System.Data.OleDb.OleDbException ex)  
                    {  
                        throw new Exception(ex.Message);  
                    }  
                    return ds;  
                }  
            }  
        }  
  
  
        private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, string cmdText, OleDbParameter[] cmdParms)  
        {  
            if (conn.State != ConnectionState.Open)  
                conn.Open();  
            cmd.Connection = conn;  
            cmd.CommandText = cmdText;  
            if (trans != null)  
                cmd.Transaction = trans;  
            cmd.CommandType = CommandType.Text;//cmdType;  
            if (cmdParms != null)  
            {  
                foreach (OleDbParameter parm in cmdParms)  
                    cmd.Parameters.Add(parm);  
            }  
        }  
 
        #endregion  
  
    }  
}  

DBHelperOleDB