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SQL Server 2005 gets closest to the ideal notification solution, because the notification infrastructure is built into the database with a messaging system called Service Broker. The Service Broker manages queues, which are database objects that have the same standing as tables, stored procedures, or views. Essentially, you can instruct SQL Server 2005 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 2005 to send notifications for any operations that would affect the results of that query. This mechanism works in a similar way to indexed views. 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. When using notification with SQL Server, 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 2005 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 when the first time the data is changed, but not if the data is changed again (unless you re-register 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. 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. 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.

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You use a different syntax to use SQL cache dependencies with SQL Server 2005. That s because it s not enough to simply identify the database name and table instead, SQL Server needs to know the exact command. If you use programmatic caching, you must create the SqlCacheDependency using the constructor that accepts a SqlCommand object. Here s an example: // Create the ADO.NET objects. SqlConnection con = WebConfigurationManager.ConnectionStrings[ "Northwind"].ConnectionString; string query = "SELECT EmployeeID, FirstName, LastName, City FROM dbo.Employees"; SqlCommand cmd = new SqlCommand(query, con); SqlDataAdapter adapter = new SqlDataAdapter(cmd); // Fill the DataSet. DataSet ds = new DataSet(); adapter.Fill(ds, "Employees"); // Create the dependency. SqlCacheDependency empDependency = new SqlCacheDependency(cmd); // Add a cache item that will be invalidated if one of its records changes // (or a new record is added in the same range). Cache.Insert("Employees", ds, empDependency); You also need to call the static SqlDependency.Start() to initialize the listening service on the web server. This needs to be performed only once for each database connection. One place you can call the Start() method is in the Application_Start() event handler. SqlDependency.Start();

Another common use of decorators is to extract some common code from the beginning or end of a set of views. This can be especially useful when looking at incoming arguments, as decorators can perform any lookups and initializations prior to calling the view. Then, decorators can simply pass fully prepared objects to the view, rather than raw strings captured from a URL.

ASP .NET gives you the ability to create your own custom cache dependencies by deriving from CacheDependency, in much the same way that SqlCacheDependency does. This feature allows you

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