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<?xml version="1.0" encoding="utf-8"?>
<configuration>
 <appSettings>
  <add key="Default" value="Default" />
 </appSettings>
 <connectionStrings>
  <add name="Default" connectionString="Data Source=192.168.1.197;User ID=diamond;Password=88888888;Initial Catalog=EmailAnalyse" providerName="System.Data.SqlClient" />
 </connectionStrings>
</configuration>
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Text;
namespace OfficeOutlook
{
    /// <summary>
    ///DataBase µÄժҪ˵Ã÷
    /// </summary>
    public class DataBase
    {
        protected SqlConnection BaseSqlConnection = new SqlConnection();//Á¬½Ó¶ÔÏó
        protected SqlCommand BaseSqlCommand = new SqlCommand();  //ÃüÁî¶ÔÏó
        public DataBase()
        {
            //
            // TODO: ÔÚ´Ë´¦Ìí¼Ó¹¹Ô캯ÊýÂß¼­
            //
        }
        protected void OpenConnection()
        {
            if (BaseSqlConnection.State == ConnectionState.Closed)  //Á¬½ÓÊÇ·ñ¹Ø±Õ
                try
                {
           &nb


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(
    @cityid int,
    @cityname nvarchar(100) output
)
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select @cityname =  city_name from BA_Hot_City where cityid = @cityid
select @cityname
go
declare @cityname nvarchar(100)
exec testguo 1,@cityname output
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