Adding Items with an Absolute Expiration Policy : SqlDataSource cache « Cache « ASP.NET Tutorial






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  3. SqlDataSource cache
<%@ Page Language="C#" Trace="true" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Web.Configuration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">    void Page_Load()
    {
        DataTable products = (DataTable)Cache["Products"];

        if (products == null)
        {
            products = GetProductsFromDB();
            Cache.Insert("Products", products, null, DateTime.Now.AddHours(1), Cache.NoSlidingExpiration);
        }

        grdProducts.DataSource = products;
        grdProducts.DataBind();
    }

    private DataTable GetProductsFromDB()
    {
        Trace.Warn("Getting products from database");
        string conString = WebConfigurationManager.ConnectionStrings ["Products"].ConnectionString;
        SqlDataAdapter dad = new SqlDataAdapter("SELECT Title,Director FROM Products", conString);
        DataTable products = new DataTable();
        dad.Fill(products);
        return products;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Absolute Expiration</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <asp:GridView
        id="grdProducts"
        Runat="server" />

    </div>
    </form>
</body>
</html>








13.13.SqlDataSource cache
13.13.1.SqlDataSource caching
13.13.2.Adding Items with an Absolute Expiration Policy
13.13.3.Adding Items with a Sliding Expiration Policy
13.13.4.Adding Items with Dependencies