using System;
using System.Collections;
using System.Configuration;
using MySql.Data;
using MySql.Data.MySqlClient;
using System.Data;

/// <summary>
///MYSQLHelper 的摘要说明
/// </summary>
public abstract class MySqlHelper
{
    //数据库连接字符串
    public static string Conn = "Database='wp';Data Source='localhost';User Id='root';Password='root';charset='utf8';pooling=true";

    // 用于缓存参数的HASH表
    private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

    /// <summary>
    ///  给定连接的数据库用假设参数执行一个sql命令（不返回数据集）
    /// </summary>
    /// <param name="connectionString">一个有效的连接字符串</param>
    /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
    /// <param name="cmdText">存储过程名称或者sql命令语句</param>
    /// <param name="commandParameters">执行命令所用参数的集合</param>
    /// <returns>执行命令所影响的行数</returns>
    public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
    {

        MySqlCommand cmd = new MySqlCommand();

        using (MySqlConnection conn = new MySqlConnection(connectionString))
        {
            PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }
    }

    /// <summary>
    /// 用现有的数据库连接执行一个sql命令（不返回数据集）
    /// </summary>
    /// <param name="connection">一个现有的数据库连接</param>
    /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
    /// <param name="cmdText">存储过程名称或者sql命令语句</param>
    /// <param name="commandParameters">执行命令所用参数的集合</param>
    /// <returns>执行命令所影响的行数</returns>
    public static int ExecuteNonQuery(MySqlConnection connection, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
    {

        MySqlCommand cmd = new MySqlCommand();

        PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
        int val = cmd.ExecuteNonQuery();
        cmd.Parameters.Clear();
        return val;
    }

    /// <summary>
    ///使用现有的SQL事务执行一个sql命令（不返回数据集）
    /// </summary>
    /// <remarks>
    ///举例:
    ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));
    /// </remarks>
    /// <param name="trans">一个现有的事务</param>
    /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
    /// <param name="cmdText">存储过程名称或者sql命令语句</param>
    /// <param name="commandParameters">执行命令所用参数的集合</param>
    /// <returns>执行命令所影响的行数</returns>
    public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] commandPara