自己封装的MSSQL的数据库操作类

/*

 * 作者: 牛腩

 * 创建时间: 2010-1-20 10:43:14

 * Email: 164423073@qq.com

 * 说明: 对MSSQL数据库的增删查改操作的封装类

 */





using System;

using System.Data;

using System.Data.SqlClient;

using System.Web.Configuration;





namespace Niunan.Tg029.Hr.Utility

{

    public class MSSQLHelper

    {

        private SqlConnection conn = null;

        private SqlCommand cmd = null;

        private SqlDataReader sdr = null;





        public MSSQLHelper()

        {

            string connStr = WebConfigurationManager.ConnectionStrings["connStr"].ToString();

            conn = new SqlConnection(connStr);

        }





        /// <summary>创建Command对象

        /// 默认是SQL语句

        /// </summary>

        /// <param name="sql">SQL语句</param>

        public void CreateCommand(string sql)

        {

            conn.Open();

            cmd = new SqlCommand(sql, conn);

        }





        /// <summary>创建存储过程的Command对象

        /// 

        /// </summary>

        /// <param name="procName">存储过程名称</param>

        public void CreateStoredCommand(string procName)

        {

            conn.Open();

            cmd = new SqlCommand(procName, conn);

            cmd.CommandType = CommandType.StoredProcedure;

        }





        /// <summary>添加参数

        /// 默认是输入参数

        /// </summary>

        /// <param name="paramName">参数名称</param>

        /// <param name="value">值</param>

        public void AddParameter(string paramName, object value)

        {

            SqlParameter p = new SqlParameter(paramName, value);

            cmd.Parameters.Add(p);

        }





        /// <summary>添加输出参数

        /// 用于存储过程

        /// </summary>

        /// <param name="paramName">参数名称</param>

        /// <param name="value">值</param>

        public void AddOutputParameter(string paramName) {

            SqlParameter p = new SqlParameter();

            p.ParameterName = paramName;

            p.Direction = ParameterDirection.Output;

            p.Size = 20;

            cmd.Parameters.Add(p);

        }





        /// <summary>获取输出参数的值

        /// 

        /// </summary>

        /// <param name="paramName">输出参数名称</param>

        /// <returns></returns>

        public string GetOutputParameter(string paramName) {

            return cmd.Parameters[paramName].Value.ToString();

        }





        /// <summary>执行增删改SQL语句或存储过程

        ///  

        /// </summary>

        /// <returns></returns>

        public bool ExecuteNonQuery()

        {

            int res;

            try

            {

                res = cmd.ExecuteNonQuery();

                if (res > 0)

                {

                    return true;

                }

            }

            catch (Exception ex)

            {

                throw ex;

            }

            finally

            {

                if (conn.State == ConnectionState.Open)

                {

                    conn.Close();

                }

            }

            return false;

        }





        /// <summary>执行查询SQL语句或存储过程

        ///  

        /// </summary>

        /// <returns></returns>

        public DataTable ExecuteQuery()

        {

            DataTable dt = new DataTable();

            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))

            {

                dt.Load(sdr);

            }

            return dt;

        }





        /// <summary>返回查询SQL语句或存储过程查询出的结果的第一行第一列的值

        /// 

        /// </summary>

        /// <returns></returns>

        public string ExecuteScalar()

        {

            string res = "";

            try

            {

                object obj = cmd.ExecuteScalar();

                if (obj != null)

                {

                    res = obj.ToString();

                }

            }

            catch (Exception ex)

            {

                throw ex;

            }

            finally

            {

                if (conn.State == ConnectionState.Open)

                {

                    conn.Close();

                }

            }

            return res;

        }









    }

}

先记下来，以备不时之需！！！