Using ExecuteScalar Method without Stored Procedures

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2002-05-12

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This simple example shows how to use the ExecuteScalar to do a SELECT MAX(column) FROM Table and return the value without using stored procedures.

<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<script language="vb" runat="server">
Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
If Not IsPostBack Then
Dim dtStartDate As DateTime = DateTime.Now.AddDays(-7)
Dim dtEndDate As DateTime = DateTime.Now.AddDays(-1)
startdate.Text = dtStartDate.ToShortDateString
enddate.Text = dtEndDate.ToShortDateString
literal1.Text = GetEditionNumber()
End If
End Sub
Function GetEditionNumber()
Dim conn As SqlConnection = 
    New SqlConnection(ConfigurationSettings.AppSettings("DSN"))
Dim cmd As SqlCommand = New SqlCommand("SELECT MAX(Id) from Table", conn)
conn.Open()
Dim id As String = cmd.ExecuteScalar
conn.Close()
Return id
End Function
</script>
<html>
<head></head>
<body>
<form runat="server">
<asp:literal id="literal1" runat="server" /><br>
<asp:TextBox id="startDate"  runat="server"></asp:TextBox><br>
<asp:TextBox id="endDate"  runat="server"></asp:TextBox>
</form>
</body>
</html>

Web.Config used in Example

<?xml version="1.0" encoding="utf-8" ?>
<configuration>  <appSettings> <add key="DSN" value="server=localhost;uid=sa;pwd=;Database=pubs"/> </appSettings></configuration>

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