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Determine what the term would be given a $225,000 loan amount, a 7% interest rate, and a $1,423 monthly payment. 1. In cell B3, type 225000. In cell B5, type 7%. 2. Click Tools Goal Seek. 3. In the Set Cell box, type or click cell B6. 4. In the To Value box, type -1423. 5. In the By Changing Cell box, type or click cell B4. 6. Click OK, and click OK again. Answer: The term for a $225,000 loan, a 7% interest rate, and a $1,423 monthly payment is about 36.6 years (just over 439 months).

Now that you ve seen how to set up your database to support SQL Server notifications, the only remaining detail is the code, which is quite straightforward. You can use your cache dependency with programmatic data caching, a data source control, and output caching. For programmatic data caching, you need to create a new SqlCacheDependency and supply that to the Cache.Insert() method, much as you did with file dependencies. In the SqlCacheDependency constructor, you supply two strings. The first is the name of the database

you defined in the <add> element in the <sqlCacheDependency> section of the web.config file. The second is the name of the linked table. Here s an example: ' Create a dependency for the Employees table. Dim empDependency As New SqlCacheDependency("Northwind", "Employees") ' Add a cache item that will be invalidated if this table changes. Cache.Insert("Employees", dsEmployees, empDependency) To perform the same trick with output caching, you simply need to set the SqlCacheDependency property of the OutputCache directive. Use the database dependency name and the table name, separated by a colon: <%@ OutputCache Duration="600" SqlDependency="Northwind:Employees" VaryByParam="none" %> The same technique works with the SqlDataSource and ObjectDataSource controls: <asp:SqlDataSource EnableCaching="True" SqlCacheDependency="Northwind:Employees" ... /> To try a complete example, you can use the downloadable code for this chapter.

Line 4 of Listing 4-4 shows how to enter a belongs to relationship in Cake. You do this by assigning an array of models that are part of the relationship to the current model. The class object variable Cake uses to build belongs to relationships is the var $belongsTo attribute. In any Cake application, belongs to relationships are made by following the code on line 4. You can add relationships by including them in the array syntax.

SQL Server 2005 and SQL Server 2008 get closest to the ideal notification solution, because the notification infrastructure is built into the database with a messaging system called the Service Broker. The Service Broker manages queues, which are database objects that have the same standing as tables, stored procedures, or views.

2008 wasn t yet released at the time of this writing, it s expected to support the ASP.NET cache dependency feature in exactly the same way as SQL Server 2005.

Essentially, you can instruct SQL Server to send notifications for specific events using the CREATE EVENT NOTIFICATION command. ASP.NET offers a higher-level model you register a query, and ASP.NET automatically instructs SQL Server to send notifications for any operations that would affect the results of that query. Every time you perform an operation, SQL Server determines whether your operation affects a registered command. If it does, SQL Server sends a notification message and stops the notification process. Figure 24-10 shows an overview of how cache invalidation works with SQL Server 2005 and SQL Server 2008.

A possible key to be included with the $belongsTo settings is className. Simply put, className is the model to which the current model belongs. In this case, it would be set to User, meaning the class name of the users table s model. If you decide to abandon Cake s model naming conventions or if there is a complex reason for naming a model other than the standard Cake convention, then you will need to specify the name in this setting; otherwise, Cake will not be able to link the association on its own.