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Figure 6-15. Configuring the SELECT query for a SqlDataSource 11. On the Configure the Select Statement step, select Player from the Name drop-down list and the * entry in the columns list. Click Next, and then click Finish to complete this part of the configuration. 12. In the Properties window for SqlDataSource2, click the ellipsis next to the SelectQuery property to open the Command and Parameter Editor dialog box. 13. Click the AddParameter button and give the new parameter a name of ManufacturerID. Select Control as the Parameter Source, and from the ControlID drop-down list, select lstManufacturers. 14. Click the Query Builder button to launch the Query Builder dialog box. As shown in Figure 6-16, add @ManufacturerID as the filter for the PlayerManufacturerID column. You can click the Execute Query option to test that the query is correct. 15. Click the OK button to close the Query Builder, and then click OK again to close the Command and Parameter Editor dialog box. 16. Select the GridView and change its DataSourceID property to SqlDataSource2. 17. Save the page, and then run it in a browser. Select one of the Manufacturers from the DropDownList. The page will post back to the server, and the list of Players will be presented based on the Manufacturer selected. Clicking the please select... entry will cause the GridView to be cleared. 18. Experiment with changing the DropDownList to a RadioButtonList and a ListBox. Notice again that all three Web controls will have the please select... entry, as well as the list of Manufacturers, and selecting an option displays the same results, regardless of the type of Web list control that you re using.

CREATE TRIGGER dbo.[Employees_AspNet_SqlCacheNotification_Trigger] ON [Employees] FOR INSERT, UPDATE, DELETE AS BEGIN SET NOCOUNT ON EXEC dbo.AspNet_SqlCacheUpdateChangeIdStoredProcedure N'Employees' END

In other words, when a change takes place on the table that s being monitored, that change triggers the AspNet_SqlCacheUpdateChangeIdStoredProcedure stored procedure. This stored procedure simply increments the changeId of the corresponding row in the change notification table:

stores the date with less precision than datetime, down to minutes, but occupies 4 bytes instead of 8.

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After having to write code to populate the list and grid, you ve now come to an example that requires very little code in order to offer the same functionality. Instead, you ve used the graphical tools provided with Visual Web Developer to build the page. First, we ll look at the DropDownList and the first SqlDataSource that you added to the page. Then we ll look at the GridView and its SqlDataSource, as well as the parameters that it requires. Finally, we ll consider some of the limitations of the SqlDataSource.

CREATE PROCEDURE dbo.AspNet_SqlCacheUpdateChangeIdStoredProcedure @tableName NVARCHAR(450) AS BEGIN UPDATE dbo.AspNet_SqlCacheTablesForChangeNotification WITH (ROWLOCK) SET changeId = changeId + 1 WHERE tableName = @tableName END GO

The AspNet_SqlCacheTablesForChangeNotification contains a single record for every table you re monitoring. As you can see, when you make a change in the table (such as inserting a record), the changeId column is incremented by 1. ASP.NET queries this table repeatedly and keeps track of the most recent changeId values for every table. When this value changes in a subsequent read, ASP.NET knows that the table has changed.

3. Select both the CartID and ProductID fields and click the golden key symbol (or right-click and select Set Primary Key) to create a composite primary key formed of these two fields. 4. Press Ctrl+S to save the table. Choose ShoppingCart for the name and click OK. 5. Add a foreign key by right-clicking the table and selecting Relationships. 6. Click Add to create a new relationship entry. 7. Select the Tables and Columns Specification (see Figure 9-5) and then click the ... button.

This hints at one of the major limitations of cache invalidation as implemented in SQL Server 2000 and SQL Server 7. Any change to the table is deemed to invalidate any query for that table. In other words, if you use this query

If you look at the HTML markup for SqlDataSource1, you ll see that apart from the ID and runat properties that all Web controls have, the SqlDataSource has two other properties that enable you to configure the Web control for your purposes: ConnectionString and SelectCommand. <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>" SelectCommand="SELECT ManufacturerID, ManufacturerName FROM Manufacturer"> </asp:SqlDataSource> The ConnectionString property sets the connection string that the SqlDataSource will use. This can be any valid connection string. In this case, you re using a new construct added in ASP.NET 2.0 that allows you to automatically retrieve the connection string from the

SELECT * FROM Employees WHERE City='London'

Figure 9-5. Adding a new relationship 8. Complete the form that appears as shown in Figure 9-6.

the caching still works in the same way. That means if any employee record is touched, even if the employee resides in another city (and therefore isn t one of the cached records), the notification is still sent and the cached item is considered invalid. Keeping track of which changes do and do not invalidate a cached data object is simply too much work for SQL Server 2000 (although it is possible in SQL Server 2005).

<connectionStrings> section of Web.config by specifying the name of the connection string in this case, SqlConnectionString: <%$ ConnectionStrings:SqlConnectionString %> The SelectCommand property is the query that the SqlDataSource will use to query the database to return the results. In this case, you return a list with the ManufacturerID and ManufacturerName entries for all of the Manufacturers in the database.

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