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Figure 24-10. Monitoring a database for changes in SQL Server 2005 or 2008 When using notification with SQL Server 2005 or SQL Server 2008, you get the following benefits over SQL Server 2000: Notification is much more fine-grained: Instead of invalidating your cached object when the table changes, SQL Server invalidates your object only when a row that affects your query is inserted, updated, or deleted. Notification is more intelligent: A notification message is sent the first time the data is changed but not if the data is changed again (unless you reregister for notification messages by adding an item back to the cache). No special steps are required to set up notification: You do not run aspnet_regsql or add polling settings to the web.config file. However, you do need to call the shared SqlDependency.Start() method somewhere in your code to start the polling service. Notifications work with SELECT queries and stored procedures. However, some restrictions exist for the SELECT syntax you can use. To properly support notifications, your command must adhere to the following rules: You must fully qualify table names in the form [Owner].table, as in dbo.Employees (not just Employees). Your query cannot use an aggregate function, such as COUNT(), MAX(), MIN(), or AVERAGE(). You cannot select all columns with the wildcard * (as in SELECT * FROM Employees). Instead, you must specifically name each column so that SQL Server can properly track changes that do and do not affect the results of your query.

Determine what the interest rate would be given an $850,000 loan amount, a 30-year term, and a $5,225 monthly payment. 1. In cell B3, type 850000. In cell B4, type 360. 2. Click Tools Goal Seek. 3. In the Set Cell box, type or click cell B6. 4. In the To Value box, type -5225. 5. In the By Changing Cell box, type or click cell B5. 6. Click OK, and click OK again. Answer: The interest rate for an $850,000 loan, a 30-year term, and a $5,225 monthly payment is 6.23%.

Here s an acceptable command: SELECT EmployeeID, FirstName, LastName, City FROM dbo.Employees These are the most important rules, but the SQL Server Books Online has a lengthy list of caveats and exceptions. If you break one of these rules, you won t receive an error. However, the notification message will be sent as soon as you register the command, and the cached item will be invalidated immediately.

SQL Server 2005 and SQL Server 2008 are often installed with carefully locked-down settings for optimum security. In order to use SQL Server notifications, you may have to enable features that are currently switched off. First, you need to enable the Service Broker, which watches for changes in the database and delivers the notifications to the appropriate queue. The Service Broker must be specifically enabled for each database that you want to use with cache dependencies. If the Service Broker isn t currently enabled for your database (or if you re just not sure), there s an easy solution. First, launch the Visual Studio 2008 Command Prompt window (click the Start button and choose Programs Microsoft Visual Studio 2008 Visual Studio Tools Visual Studio 2008 Command Prompt). Then, run the SqlCmd.exe command-line utility, specifying the S parameter and the name of your server. Here s an example: SqlCmd -S localhost\SQLEXPRESS This connects to SQL Server Express on the current computer. If you re using the full version of SQL Server, you won t need to supply the instance name (you can use just localhost instead of localhost\SQLEXPRESS). If your database is installed on another server, use its computer name instead of localhost. The SqlCmd.exe utility provides a command prompt where you can enter SQL commands. Use it to enter the following SQL statements: USE Northwind ALTER DATABASE Northwind SET ENABLE_BROKER GO Of course, if you want to enable the Service Broker for a different database (other than Northwind), you can modify this SQL accordingly. You can enable the Service Broker for as many databases as you d like. Once you re finished, type quit to exit the SqlCmd tool.

This key sets the foreign key found in the related model. This setting is useful for specifying multiple belongs to relationships.

Before you can use SQL cache dependencies with SQL Server 2005 or SQL Server 2008, you need to call the shared SqlDependency.Start() method. This initializes the listening service on the web server. Dim connectionString As String = _ WebConfigurationManager.ConnectionStrings("Northwind").ConnectionString SqlDependency.Start(connectionString) You need to call the Start() method only once over the lifetime of your web application, so it often makes sense to place the call in the Application_Start() method of the Global.asax file so it s triggered automatically. It s safe to call the Start() method even if the listener is already started, as this won t cause an error. You can also use the Stop() method to halt the listener.