我正在尝试将多查询sql中的数据显示到我的aspx页面,但是没有把事情搞定。
我有一个母版页,我想在sql中显示值。
我的主页(Site.Master):
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="MySite.SiteMaster" %>
<!DOCTYPE html>
<html lang="en">
<head runat="server"></head>
<body>
<form runat="server">
<div class="content">
<div>
<font class="label label-primary"><%= DateTime.Now.ToShortDateString() %>
<asp:Label runat="server" ID="LabelCountMember"></asp:Label>
<asp:Label runat="server" ID="LabelCountLogins"></asp:Label>
<asp:Label runat="server" ID="LabelCountFailedLogins"></asp:Label>
</div>
<asp:ContentPlaceHolder ID="MainContent" runat="server">
</asp:ContentPlaceHolder>
<hr />
<footer>
<p>This is my footer!</p>
</footer>
</div>
</form>
</body>
</html>
我的代码隐藏文件(Site.Master.cs):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Data;
namespace MySite
{
public partial class SiteMaster : MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
}
public void countmembers(object sender, EventArgs e)
{
string sql = @"SELECT (SELECT COUNT(MemberID) from MyTable where Mamber = 'Registered') AS AllRegMembers,
(SELECT COUNT(MemberID) from MyTable where LoginStatus = 'ok') AS AllLogins,
(SELECT COUNT(MemberID) from MyTable where LoginStatus = 'fail') AS AllFailLogins";
string variable;
using (var connection = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnString"].ConnectionString))
using (var command = new SqlCommand(sql, connection))
{
connection.Open();
using (var reader = command.ExecuteReader())
{
//Check the reader has data:
if (reader.Read())
{
variable = reader.GetInt32(reader.GetOrdinal("AllRegMembers")).ToString();
}
// If you need to use all rows returned use a loop:
while (reader.Read())
{
// Do something
string strAllRegMembers = reader.GetInt32(reader.GetOrdinal("AllRegMembers")).ToString();
string strAllLogins = reader.GetInt32(reader.GetOrdinal("AllLogins")).ToString();
string strAllFailLogins = reader.GetInt32(reader.GetOrdinal("AllFailLogins")).ToString();
Label.LabelCountMember.Text = strAllRegMembers;
Label.LabelCountLogins.Text = strAllLogins;
Label.LabelCountFailedLogins.Text = strAllFailLogins;
}
}
}
}
}
}
请帮我理清基本结构。我尝试了很多不同的方法,但没有一种方法可行,我真的无法找到一个简单的例子来处理读者的多个值。我很想用错误的关键词搜索。
我可以使用以下代码在Classic ASP中使用它,但我真的想开始转向C#。
<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<!--#include file="dbcon.asp" -->
<%
sql = "SELECT (SELECT COUNT(MemberID) from MyTable where Mamber = 'Registered') AS AllRegMembers, " & _
"SELECT COUNT(MemberID) from MyTable where LoginStatus = 'ok') AS AllLogins, " & _
"(SELECT COUNT(MemberID) from MyTable where LoginStatus = 'fail') AS AllFailLogins";"
call dbOpen(conn)
Set rs = conn.Execute(sql)
strAllRegMembers = rs("AllRegMembers")
strAllLogins = rs("AllLogins")
strAllFailLogins = rs("AllFailLogins")
rs.Close : Set rs = Nothing
Call dbClose(conn)
%>
<!DOCTYPE HTML>
<html>
<head></head>
<body>
<span>Registered members: <%= strAllRegMembers %></span>
<span>Number of OK logins: <%= strAllLogins %></span>
<span>Number of failed logins: <%= strAllFailLogins %></span>
</body>
</html>
感谢Chris和Jo Biesta在下面提供了一个有效的代码隐藏文件。 Perfekt伙计们,谢谢!
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Data;
namespace MySite
{
public partial class SiteMaster : MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
countmembers();
}
public void countmembers()
{
string strAllRegMembers = String.Empty;
string strAllLogins = String.Empty;
string strAllFailLogins = String.Empty;
string sql = @"SELECT (SELECT COUNT(MemberID) from MyTable where Mamber = 'Registered') AS AllRegMembers,
(SELECT COUNT(MemberID) from MyTable where LoginStatus = 'ok') AS AllLogins,
(SELECT COUNT(MemberID) from MyTable where LoginStatus = 'fail') AS AllFailLogins";
string variable;
using (var connection = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnString"].ConnectionString))
using (var command = new SqlCommand(sql, connection))
{
connection.Open();
using (var reader = command.ExecuteReader())
{
//Check the reader has data:
if (reader.Read())
{
variable = reader.GetInt32(reader.GetOrdinal("AllRegMembers")).ToString();
}
// If you need to use all rows returned use a loop:
while (reader.Read())
{
// Do something
strAllRegMembers = reader.GetInt32(reader.GetOrdinal("AllRegMembers")).ToString();
strAllLogins = reader.GetInt32(reader.GetOrdinal("AllLogins")).ToString();
strAllFailLogins = reader.GetInt32(reader.GetOrdinal("AllFailLogins")).ToString();
}
}
}
LabelCountMember.Text = strAllRegMembers;
LabelCountLogins.Text = strAllLogins;
LabelCountFailedLogins.Text = strAllFailLogins;
}
}
}
对于其他可能会觉得有用的人。如果您以文本格式返回值,请改用:
reader.GetString(reader.GetOrdinal("AllRegMembers"));
答案 0 :(得分:1)
除非我错过了一些东西(在我的手机上阅读代码有点棘手),看起来好像你的问题是没有任何东西在调用你的countmembers方法。
尝试从页面加载方法调用该方法,看看你是如何继续的。
同样克里斯建议,在代码中放置一个调试点并逐步完成。然后你会看到它不工作的地方。
答案 1 :(得分:1)
请尝试以下代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Data;
namespace MySite
{
public partial class SiteMaster : MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
countmembers();
}
public void countmembers()
{
string strAllRegMembers = String.Empty;
string strAllLogins = String.Empty;
string strAllFailLogins = String.Empty;
string sql = @"SELECT (SELECT COUNT(MemberID) from MyTable where Mamber = 'Registered') AS AllRegMembers,
(SELECT COUNT(MemberID) from MyTable where LoginStatus = 'ok') AS AllLogins,
(SELECT COUNT(MemberID) from MyTable where LoginStatus = 'fail') AS AllFailLogins";
string variable;
using (var connection = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnString"].ConnectionString))
using (var command = new SqlCommand(sql, connection))
{
connection.Open();
using (var reader = command.ExecuteReader())
{
//Check the reader has data:
if (reader.Read())
{
variable = reader.GetInt32(reader.GetOrdinal("AllRegMembers")).ToString();
}
// If you need to use all rows returned use a loop:
while (reader.Read())
{
// Do something
strAllRegMembers = reader.GetInt32(reader.GetOrdinal("AllRegMembers")).ToString();
strAllLogins = reader.GetInt32(reader.GetOrdinal("AllLogins")).ToString();
strAllFailLogins = reader.GetInt32(reader.GetOrdinal("AllFailLogins")).ToString();
}
}
}
Label.LabelCountMember.Text = strAllRegMembers;
Label.LabelCountLogins.Text = strAllLogins;
Label.LabelCountFailedLogins.Text = strAllFailLogins;
}
}
}