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Before you can use SQL Server cache invalidation, you need to enable notifications for the database. This task is performed with the aspnet_regsql.exe command-line utility, which is located in the c:\Windows\Microsoft.NET\Framework\v2.0.50727 directory. To enable notifications, you need to use the -ed command-line switch. You also need to identify the server (use -E for a trusted connection, and -S to choose a server other than the current computer) and the database (use -d). Here s an example that enables notifications for the Northwind database on the current server:

aspnet_regsql -ed -E -d Northwind When you take this step, a new table named SqlCacheTablesForChangeNotification is added to the database named Northwind (which must already exist). The SqlCacheTablesForChangeNotification table has three columns: tableName, notificationCreated, and changeId. This table is used to track changes. Essentially, when a change takes place, SQL Server writes a record to this table. ASP.NET s polling service queries this table. This design achieves a number of benefits: Because the change notification table is much smaller than the table with the cached data, it s much faster to query. Because the change notification table isn t used for other tasks, reading these records won t risk locking and concurrency issues. Because multiple tables in the same database will use the same notification table, you can monitor several tables at once without increasing the polling overhead. Figure 24-9 shows an overview of how SQL Server 2000 cache invalidation works.

Figure 24-9. Monitoring a database for changes in SQL Server 2000 Even once you ve created the SqlCacheTablesForChangeNotification table, you still need to enable notification support for each table. You can do this manually using the SqlCacheRegisterTableStoredProcedure, or you can rely on aspnet_regsql by using the -et parameter to turn on the notifications and the -t parameter to name the table. Here s an example that enables notifications for the Employees table in the Northwind database: aspnet_regsql -et -E -d Northwind -t Employees This step generates the notification trigger for the Employees table.

Listing 4-3. The SQL Table Structures CREATE TABLE `posts` ( `id` int(11) unsigned NOT NULL auto_increment, `name` varchar(255) default NULL, `date` datetime default NULL, `content` text, `user_id` int(11) default NULL, PRIMARY KEY (`id`) ); CREATE TABLE `comments` ( `id` int(11) unsigned NOT NULL auto_increment, `name` varchar(100) default NULL, `content` text, `post_id` int(11) default NULL, PRIMARY KEY (`id`) ); CREATE TABLE `users` ( `id` int(11) unsigned NOT NULL auto_increment, `name` varchar(100) default NULL, `email` varchar(150) default NULL, `firstname` varchar(60) default NULL, `lastname` varchar(60) default NULL, PRIMARY KEY (`id`) ); The users table will contain a running list of available authors of blog posts. When a post is created, it will be assigned an author from the users table. Notice that there is a field in the posts table named user_id. This will match up with the id field in the users table, thus linking an author to the post. Also, in the comments table, each comment will be assigned to a post in the same manner. In this case there is a field named post_id, which will match up with the id field in the posts table. In the models, you will spell out these associations so Cake can pull them together. What s more, you can test how well you ve specified the associations using the scaffolding feature. As noted earlier, one main idea in Cake application building is to start with the Cake objects and build out. In general, you will design your database structure first, test their associations in the scaffolding, and then build out with your own code to enhance the application.