摘要： using System;using System.Collections.Generic;using System.Text;using System.Data.Common;using System.Configuration;using System.Data;namespace DAL{ public class Database { #region 字段 private const string defaultConnectionConfigKey ="default"; /// <summary> /// 数据连接字符串 /// </summa 阅读全文

摘要： select count(*) from house_data 阅读全文