实现在线用户列表的简单方法
因最近时间空点,写点个人心得了~,我们经常在程序中要实现显示当前有多少用户在线,以及在线用户的操作状态的功能,看了园子里朋友都有一些非常好的思路,这里我也提供一种很简单的方法:
1,用户登陆后,在每一次加载新的页面时判断权限(这是常规操作) 的同时,把用户状态写入一张OnlineUser表里,如果发现没有这个用户,就添加进OnlineUser表。
2,在查询当前在线用户时,查询OnlineUser表即可。
3,用户退出程序时,加删除OnlineUser表中对应用户ID的记录。
4,用户非正常退出程序时,用DELETE FROM OnlineUser WHERE (DATEDIFF(ss, LastActTime, GETDATE()) > " + GlobalVar.Timeouts * 60 + ")的记录。
BasePage中刷新在线用户操作状态的代码如下:
if (Session["UserID"] == null)
{
this.ErrorMsg(GlobalVar.PE_LOGIN_TIME_OUT);
}
else
{
this.RefreshOnlineUser();
}
其中GlobalValTimeouts 为自定义超时时间,GlobalVar.DBName为数据库,Query.ProcessSql是用听棠.Net的SPL持久层。
大家如有不同建议,请提出啊,我下一步想法是用AJAX来实现在线用户列出来。
1,用户登陆后,在每一次加载新的页面时判断权限(这是常规操作) 的同时,把用户状态写入一张OnlineUser表里,如果发现没有这个用户,就添加进OnlineUser表。
2,在查询当前在线用户时,查询OnlineUser表即可。
3,用户退出程序时,加删除OnlineUser表中对应用户ID的记录。
4,用户非正常退出程序时,用DELETE FROM OnlineUser WHERE (DATEDIFF(ss, LastActTime, GETDATE()) > " + GlobalVar.Timeouts * 60 + ")的记录。
BasePage中刷新在线用户操作状态的代码如下:
1
/// <summary>
2
/// 刷新在线用户
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/// </summary>
4
private void RefreshOnlineUser()
5
{
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string sUserID = Session["UserID"].ToString();
7
string sSQL = "";
8
sSQL = "SELECT ID FROM OnlineUser WHERE (UserID = '" + sUserID + "')";
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DataTable dt = Query.ProcessSql(sSQL, GlobalVar.DBName);
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if (dt.Rows.Count > 0)
11
{
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string sID = dt.Rows[0]["ID"].ToString();
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sSQL = "UPDATE OnlineUser SET LastActTime = '" + DateTime.Now.ToString() + "' WHERE (ID = '" + sID + "')";
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Query.ProcessSql(sSQL, GlobalVar.DBName);
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}
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else
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{
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OnlineUserEntity sou = new OnlineUserEntity(); //此处用了听棠的SPL来做数据操作,具体可查看听棠.Net BLOG
19
sou.ID = Guid.NewGuid().ToString();
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sou.UserID = sUserID;
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sou.IPAddress = Request.UserHostAddress;
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sou.Browser = Request.ServerVariables["HTTP_USER_AGENT"].ToString();
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sou.StartTime = DateTime.Now;
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sou.LastActTime = DateTime.Now;
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sou.Save();
26
}
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dt.Dispose();
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sSQL = "DELETE FROM OnlineUser WHERE (DATEDIFF(ss, LastActTime, GETDATE()) > " + GlobalVar.Timeouts * 60 + ")";
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Query.ProcessSql(sSQL, GlobalVar.DBName);
30
}
判断权限函数中部分涉及在线用户的代码:![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedBlockEnd.gif)
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![](/Images/OutliningIndicators/None.gif)
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![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
25
![](/Images/OutliningIndicators/InBlock.gif)
26
![](/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
30
![](/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](/Images/OutliningIndicators/InBlock.gif)
![](/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](/Images/OutliningIndicators/InBlock.gif)
![](/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](/Images/OutliningIndicators/None.gif)
其中GlobalValTimeouts 为自定义超时时间,GlobalVar.DBName为数据库,Query.ProcessSql是用听棠.Net的SPL持久层。
大家如有不同建议,请提出啊,我下一步想法是用AJAX来实现在线用户列出来。