SqlDependency (VB) : SQL Cache Dependencies « Cache « ASP.NET Tutorial
- ASP.NET Tutorial
- Cache
- SQL Cache Dependencies
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" Height="400px" Width="400px">
</asp:GridView>
</div>
</form>
</body>
</html>
File: Default.aspx.vb
Imports System.Data
Imports System.Configuration
Imports System.Data.SqlClient
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Response.Write("Page created: " + DateTime.Now.ToLongTimeString())
Dim connStr As String = ConfigurationManager.ConnectionStrings("AppConnectionString1").ConnectionString
SqlDependency.Start(connStr)
Dim connection As New SqlConnection(connStr)
Dim command As New SqlCommand("Select * FROM Customers", connection)
Dim depends As New SqlCacheDependency(command)
connection.Open()
GridView1.DataSource = command.ExecuteReader()
GridView1.DataBind()
connection.Close()
Response.AddCacheDependency(depends)
End Sub
End Class
File: Web.config
<?xml version="1.0"?>
<configuration>
<appSettings/>
<connectionStrings>
<add name="AppConnectionString1" connectionString="Data Source=.\SQLEXPRESS;User ID=wrox;Password=wrox1*c;Database=Northwind;Persist Security Info=False" providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.web>
<caching>
<sqlCacheDependency enabled="true">
<databases>
<add name="Northwind" connectionStringName="AppConnectionString1" pollTime="500"/>
</databases>
</sqlCacheDependency>
</caching>
<compilation debug="true" strict="false" explicit="true"/>
<pages>
<namespaces>
<clear/>
<add namespace="System"/>
<add namespace="System.Collections"/>
<add namespace="System.Collections.Specialized"/>
<add namespace="System.Configuration"/>
<add namespace="System.Text"/>
<add namespace="System.Text.RegularExpressions"/>
<add namespace="System.Web"/>
<add namespace="System.Web.Caching"/>
<add namespace="System.Web.SessionState"/>
<add namespace="System.Web.Security"/>
<add namespace="System.Web.Profile"/>
<add namespace="System.Web.UI"/>
<add namespace="System.Web.UI.WebControls"/>
<add namespace="System.Web.UI.WebControls.WebParts"/>
<add namespace="System.Web.UI.HtmlControls"/>
</namespaces>
</pages>
<authentication mode="Windows"/>
</system.web>
</configuration>