初学者遇到问题了。。大家帮帮忙。。。
前台。。 ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
<style type="text/css">
.style1
{
height: 106px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div class="style1">
用户名<asp:TextBox ID="TextBox1" runat="server" Height="22px"></asp:TextBox>
密码 <asp:TextBox ID="TextBox2" runat="server" Height="22px"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" Height="26px" Width="56px" />
<br /><asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</div>
</form>
</body>
</html>
后台。。 ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
Imports System.Data.SqlClient
Imports System.Data
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Button_Click(ByVal sender As Object, ByVal e As System.EventArgs)
'创建数据库连接↓
Dim conn As SqlConnection
Dim comd As SqlCommand
Dim datar As SqlDataReader
Dim sql As String
conn = New SqlConnection("Server=local;user id=sa;pwd=123321;database=liu")
conn.Open()
'执行sql语句↓
sql = "SELECT 用户名 FROM 用户"
comd = New SqlCommand(sql, conn)
datar = comd.ExecuteReader()
conn.Close()
Label1.text = datar
End Sub
End Class
大家帮忙看看。数据库连接对了吗？ 还有就是假如我想查看那个datar到底显示的什么。。在哪可以打印出来？
[解决办法]
不对，参考msdn代码
private static void CreateCommand(string queryString,
string connectionString)
{
using (SqlConnection connection = new SqlConnection(
connectionString))
{
connection.Open();
SqlCommand command = new SqlCommand(queryString, connection);
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Console.WriteLine(String.Format("{0}", reader[0]));
}
}
}
