Mysql的DBHelper.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using MySql.Data.MySqlClient;
namespace i_salesDAL
{
public class DBHelper
{
//引导数据库连接数据库调用Web.Config文件
private static MySqlConnection connection;
//创建连接
public static MySqlConnection Connection
{
get
{
MySqlConnection myConn = new MySqlConnection("server=localhost;user id=root;password=root;database=google;CharSet=gb2312;");
string connectionString = myConn.ConnectionString;
if (connection == null)
{
connection = new MySqlConnection(connectionString);
//打开连接
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
//（无参）返回执行的行数(删除修改更新)
public static int ExecuteCommand(string safeSql)
{
MySqlCommand cmd = new MySqlCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
//（有参）
public static int ExecuteCommand(string sql, params MySqlParameter[] values)
{
MySqlCommand cmd = new MySqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
}
//（无参）返回第一行第一列(删除修改更新)
public static int GetScalar(string safeSql)
{
MySqlCommand cmd = new MySqlCommand(safeSql, Con