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摘要： using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data.SqlClient;using System.Configuration;using System.Data;using BookShop.Models;namespace BookShop.DAL{ class DBHeler:IDisposable { private string connectionString; //配置文件的连接字符串语句 private bool isConnecte 阅读全文