SqlHelper类库

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;

namespace BFB.DAL
{
    /// <summary>
    /// 
    /// </summary>
    public class SqlHelper
    {
        /// <summary>
        /// 
        /// </summary>
        private string strConnectionString = "";
        /// <summary>
        /// 连库类
        /// </summary>
        public static SqlConnection cnn;
        /// <summary>
        /// 执行类库
        /// </summary>
        public SqlCommand com;
        /// <summary>
        /// 
        /// </summary>
        public SqlHelper()
        {
            string server = File.ReadAllText("ServerIP.txt");
            strConnectionString = string.Format(@"Data Source={0};uid=aaaa;pwd=123456;database=HundredMIS", server);
        }
        /// <summary>
        ///打开数据库连接
        /// </summary>
        public void Open()
        {
            if (cnn == null)
            {
                cnn = new SqlConnection(strConnectionString);

            }
            if (cnn.State == ConnectionState.Closed)
            {
                try
                {
                    cnn.Open();
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }

            }
        }
        /// <summary>
        /// 关闭数据库连接
        /// </summary>
        public void close()
        {
            if (cnn != null)
            {
                if (cnn.State == ConnectionState.Open)
                {
                    cnn.Close();
                }
            }

        }
        /// <summary>
        /// 释放资源
        /// </summary>
        public void Dispose()
        {
            // 确认连接是否已经关闭
            if (cnn != null)
            {
                cnn.Dispose();

                cnn = null;
            }
        }
        /// <summary>
        /// 返回影响行数
        /// </summary>
        /// <param name="query"></param>
        /// <returns></returns>
        public int ExecuteNonQuery(string query)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("INSERT") | query.StartsWith("insert") | query.StartsWith("UPDATE") | query.StartsWith("update") | query.StartsWith("DELETE") | query.StartsWith("delete"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            int retval;
            try
            {
                cnn.Open();
                retval = cmd.ExecuteNonQuery();
            }
            catch (Exception exp)
            {
                throw exp;
            }
            finally
            {
                if (cnn.State == ConnectionState.Open)
                {
                    cnn.Close();
                }
            }
            return retval;
        }
        /// <summary>
        /// 返回影响行数
        /// </summary>
        /// <param name="query"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public int ExecuteNonQuery(string query, params SqlParameter[] parameters)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("INSERT") | query.StartsWith("insert") | query.StartsWith("UPDATE") | query.StartsWith("update") | query.StartsWith("DELETE") | query.StartsWith("delete"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            for (int i = 0; i <= parameters.Length - 1; i++)
            {
                cmd.Parameters.Add(parameters[i]);
            }
            cnn.Open();
            int retval = cmd.ExecuteNonQuery();
            cnn.Close();
            return retval;
        }
        /// <summary>
        /// 查询第一行第一列
        /// </summary>
        /// <param name="query"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public object ExecuteScalar(string query)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("SELECT") | query.StartsWith("select"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            cnn.Open();
            object retval = cmd.ExecuteScalar();
            cnn.Close();
            return retval;
        }

        public object ExecuteScalar(string query, params SqlParameter[] parameters)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("SELECT") | query.StartsWith("select"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            for (int i = 0; i <= parameters.Length - 1; i++)
            {
                cmd.Parameters.Add(parameters[i]);
            }
            cnn.Open();
            object retval = cmd.ExecuteScalar();
            cnn.Close();
            return retval;
        }
        /// <summary>
        /// 使用Select查询，返回SqlDataReader类型
        /// </summary>
        /// <param name="query">查询命令</param>
        /// <returns></returns>
        public SqlDataReader ExecuteReader(string query)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("SELECT") | query.StartsWith("select"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cnn.Open();
            }
            SqlDataReader dr;
            try
            {
                dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return dr;
            }
            catch (Exception ee)
            {
                cnn.Close();
                throw ee;

            }

        }
        /// <summary>
        /// 使用存储过程查询，返回SqlDataReader类型
        /// </summary>
        /// <param name="query">存储过程名</param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public SqlDataReader ExecuteReader(string query, params SqlParameter[] parameters)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("SELECT") | query.StartsWith("select"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            for (int i = 0; i <= parameters.Length - 1; i++)
            {
                cmd.Parameters.Add(parameters[i]);
            }
            cnn.Open();
            return cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
        /// <summary>
        /// 使用Select查询，返回DataSet类型
        /// </summary>
        /// <param name="query">查询命令</param>
        /// <returns></returns>
        public DataSet ExecuteDataSet(string query)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("SELECT") | query.StartsWith("select"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            DataSet ds = new DataSet();
            da.Fill(ds);
            return ds;
        }
        /// <summary>
        /// 使用存储过程查询，返回DataSet类型
        /// </summary>
        /// <param name="query">存储过程名</param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public DataSet ExecuteDataSet(string query, params SqlParameter[] parameters)
        {
            cnn = new SqlConnection(strConnectionString);
            SqlCommand cmd = new SqlCommand(query, cnn);
            if (query.StartsWith("SELECT") | query.StartsWith("select"))
            {
                cmd.CommandType = CommandType.Text;
            }
            else
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            for (int i = 0; i <= parameters.Length - 1; i++)
            {
                cmd.Parameters.Add(parameters[i]);
            }
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            DataSet ds = new DataSet();
            da.Fill(ds);
            return ds;
        }
    }
}