学步园

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.ComponentModel;namespace SQLHelper
{
    /**//// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    public class SQLHelper
    {
        // 连接数据源
        private SqlConnection myConnection;
        private readonly string RETURNVALUE = "RETURNVALUE";

        /**//// <summary>
        /// 打开数据库连接.
        /// </summary>
        private void Open() 
        {
            // 打开数据库连接
            if (myConnection == null) 
            {
                myConnection = new SqlConnection(ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString());                
            }                
            if(myConnection.State == ConnectionState.Closed)
            {   
                try
                {
                    /**////打开数据库连接
                    myConnection.Open();
                }
                catch(Exception ex)
                {
                    SystemError.SystemLog(ex.Message);
                }
                finally
                {
                    /**////关闭已经打开的数据库连接                
                }
            }
        }

        /**//// <summary>
        /// 关闭数据库连接
        /// </summary>
        public void Close() 
        {
            /**////判断连接是否已经创建
            if(myConnection != null)
            {
                /**////判断连接的状态是否打开
                if(myConnection.State == ConnectionState.Open)
                {
                    myConnection.Close();
                }
            }
        }

        /**//// <summary>
        /// 释放资源
        /// </summary>
        public void Dispose() 
        {
            // 确认连接是否已经关闭
            if (myConnection != null) 
            {
                myConnection.Dispose();
                myConnection = null;
            }                
        }
        
        /**//// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <returns>返回存储过程返回值</returns>
        public int RunProc(string procName) 
        {
            SqlCommand cmd = CreateCommand(procName, null);
            try
            {
                /**////执行存储过程
                cmd.ExecuteNonQuery();
            }
            catch(Exception ex)
            {
                /**////记录错误日志
                SystemError.SystemLog(ex.Message);
            }
            /**////关闭数据库的连接
            Close();
            
            /**////返回存储过程的参数值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

        /**//// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程名称</param>
        /// <param name="prams">存储过程所需参数</param>
        /// <returns>返回存储过程返回值</returns>
        public int RunProc(string procName, SqlParameter[] prams) 
        {
            SqlCommand cmd = CreateCommand(procName, prams);
            try
            {
                /**////执行存储过程
                cmd.ExecuteNonQuery();
            }
            catch(Exception ex)
            {
                /**////记录错误日志
                SystemError.SystemLog(ex.Message);
            }
            /**////关闭数据库的连接
            Close();
            
            /**////返回存储过程的参数值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

        /**//// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <param name="dataReader">返回存储过程返回值</param>
        public void RunProc(string procName, out SqlDataReader dataReader) 
        {
            /**////创建Command
            SqlCommand cmd = CreateCommand(procName, null);
            
            /**////读取数据
            dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);                
        }

        /**//// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <param name="prams">存储过程所需参数</param>
        /// <param name="dataReader">存储过程所需参数</param>
        public void RunProc(string procName, SqlParameter[] prams, out SqlDataReader dataReader) 
        {
            /**////创建Command
            SqlCommand cmd = CreateCommand(procName, prams);
            
            /**////读取数据
            dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
        
        /**//// <summary>
        /// 创建一个SqlCommand对象以此来执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <param name="prams">存储过程所需参数</param>
        /// <returns>返回SqlCommand对象</returns>
        private SqlCommand CreateCommand(string procName, SqlParameter[] prams) 
        {
            /**////打开数据库连接
            Open();
            
            /**////设置Command
            SqlCommand cmd = new SqlCommand(procName, myConnection);
            cmd.CommandType = CommandType.StoredProcedure;

            /**////添加把存储过程的参数
            if (prams != null)