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把李天平老师的代码拿过来学习
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
namespace Maticsoft.DBUtility
{
    ///

    /// 数据访问抽象基础类
    /// Copyright (C) 2004-2008 By LiTianPing
    ///

    public abstract class DbHelperSQL
    {
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.  
        public static string connectionString = PubConstant.ConnectionString;      
        public DbHelperSQL()
        {            
        }