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CHAPTER 11 DATA ACCESS LAYER SERVICES
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if (dv == null) { dv = new DataView( GetAuthors().Tables[0], "", sortExpr, DataViewRowState.CurrentRows); Cache.Insert(sCacheEntry, dv, new SqlCacheDependency("Publishers", "authors")); } gvAuthors.DataSource = dv; gvAuthors.DataBind(); } Now every time the user sorts, a new database-dependent cache entry gets created. The database does not, however, get polled by each dependency. One request is made to retrieve all change notifications. These dependencies can also be used with output caching. The following OutputCache directive will make the page s output dependent upon a change to the authors table (see OutputCacheIE.aspx in the Web11 project). <%@ OutputCache SqlDependency="Publishers:authors" Duration="9999" VaryByParam="none" %> The first attribute names your cache entry in the configuration file, followed by a colon and the name of the table to watch. Keep in mind that the duration attribute determines the absolute expiration of the entry in the output cache. The polling time is still determined by the SqlCacheDepedency entry you made in the web.config using the aspnet_regsql command line tool.
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Automating SQL Cache Dependency Administration
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You can also perform the setup using an administrative helper type built into the Framework: SqlCacheDependencyAdmin. This type exposes a number of static methods (see Table 11-5). There are pairs for enabling and disabling databases and tables, and a method for retrieving a list of tables set up for notification. You can use these methods from an administrative tool during development as an alternative to the aspnet_regsql command line tool, or use them to dynamically set up and tear down dependencies at runtime. You ll use this type to build a simple admin tool for setting up databases and tables for SQL cache dependencies. You ll use a drop-down list and a grid view to display databases and tables (see Figure 11-7). You can use this interface during project development to configure cache dependencies.
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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Table 11-5. Static Methods of the SQL Cache Dependency Administration Class
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Method Name
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EnableNotifications DisableNotifications EnableTableForNotifications DisableTableForNotifications GetTablesEnabledForNotifications
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Sets up a database for notifications. Same as the -ed command line switch. Tears down the setup for notifications. Same as the -dd switch. Sets up a table for notifications. Same as the -et switch. Tears down the setup for notifications. Same as the -dt switch. Returns an array of strings naming the tables set up for notification.
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Figure 11-7. A custom made adminstration interface for SQL dependencies Here s the markup for the drop-down list, the grid view, and the buttons needed to fire postbacks (see SetupSqlCache.aspx in the Web11 project). <asp:DropDownList ID="ddlDatabase" Runat="server" AutoPostBack=true OnSelectedIndexChanged="ddlDatabase_SelectedIndexChanged" /> <br /><br /> <asp:GridView AutoGenerateColumns=false ID="gvTables" Runat="server"
CHAPTER 11 DATA ACCESS LAYER SERVICES
BorderWidth="1px" BackColor="White" CellPadding="4" BorderStyle="None" BorderColor="#3366CC"> <FooterStyle ForeColor="#003399" BackColor="#99CCCC"></FooterStyle> <PagerStyle ForeColor="#003399" HorizontalAlign="Left" BackColor="#99CCCC" /> <HeaderStyle ForeColor="#CCCCFF" Font-Bold="True" BackColor="#003399" /> <SelectedRowStyle ForeColor="#CCFF99" Font-Bold="True" BackColor="#009999" /> <RowStyle ForeColor="#003399" BackColor="White" /> <AlternatingRowStyle ForeColor=White BackColor=DodgerBlue /> <Columns> <asp:BoundField DataField='name' HeaderText='Table Name' /> <asp:TemplateField HeaderText='Configured'> <ItemTemplate> <asp:checkbox runat='server' TableName='<%# Eval("name") %>' Checked='<%# Convert.ToBoolean(Eval("Configured")) %>' OnCheckedChanged='FlipBit' /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> <asp:button Runat=server id=btnSave Text='Save Changes' OnClick="btnSave_Click" Visible="False" /> <asp:Button ID="Button1" Runat="server" Text="Enable this Database" OnClick="Button1_Click" Visible="False" /> When the page first loads, the drop-down list will be populated with a list of databases for the server you re using. protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { string sql = "SELECT name FROM sysdatabases ORDER BY name"; SqlConnection cn = new SqlConnection
CHAPTER 11 DATA ACCESS LAYER SERVICES
(BuildConnStr("master")); SqlCommand cm = new SqlCommand(sql, cn); cn.Open(); ddlDatabase.DataSource = cm.ExecuteReader(); ddlDatabase.DataTextField = "name"; ddlDatabase.DataBind(); cn.Close(); ddlDatabase.Items.Insert(0, ""); } } A blank list item gets added to the top of the drop down, so there s no database selected when the page first renders. Since you re connecting to any number of databases for configuration, connections rely on a helper method to dynamically build the connection string. private string BuildConnStr(string Database) { return string.Format ("server=.;database={0};uid=sa;pwd=", Database); } When the user makes a selection from the list, the selected index changed event trap fires on the server (autopostback is set to true on the control). The trap calls the BindGrid method, which uses the name of the database the user has chosen to dynamically build a connection string, and queries the sysobjects table for all table names within the database. protected void ddlDatabase_SelectedIndexChanged(object sender, EventArgs e) { BindGrid(); } void BindGrid() { string sql = "SELECT sysobjects.name, " + "sysobjects.type, case coalesce " + "(AspNet_SqlCacheTablesForChangeNotification.tableName, " + "'0') when '0' then 'false' else 'true' end AS Configured "+ "FROM sysobjects LEFT OUTER JOIN " + "AspNet_SqlCacheTablesForChangeNotification " + "ON sysobjects.name = " + "AspNet_SqlCacheTablesForChangeNotification.tableName " + "WHERE (sysobjects.type = 'U') " + "ORDER BY sysobjects.name"; SqlConnection cn = new SqlConnection( BuildConnStr(ddlDatabase.SelectedValue)); SqlCommand cm = new SqlCommand(sql, cn);
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