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The goal is to apply decorators to third-party views without actually modifying third-party code. The key to doing this lies in the older-style decorator syntax from Python 2.3 and earlier. Remember that the new syntax allows decorators to be applied above the function definition, but the older syntax relies on passing the function to the decorator directly. Since Python functions can be imported from anywhere and can be passed in as arguments at any time, this is an excellent way to create decorated views from third-party code. Also remember that the URL configuration is defined in a Python module, which gets executed when it is read. This makes the wide array of Python available to this configuration, including the ability to pass functions into decorators to create new functions.

Using SQL cache dependencies still entails more complexity than just using a time-based expiration policy. If it s acceptable for certain information to be used without reflecting all the most recent changes (and developers often overestimate the importance of up-to-the-millisecond live information), you may not need it at all.

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ASP .NET uses a polling model for SQL Server 2000 and SQL Server 7. Older versions of SQL Server and other databases aren t supported (although third parties can implement their own solutions by creating a custom dependency class). With the polling model, ASP.NET keeps a connection open to the database and uses a dedicated thread to check periodically if a table has been updated. The effect of tying up one connection in this way isn t terribly significant, but the extra database work involved with polling does add some database overhead. For the polling model to be effective, the polling process needs to be quicker and lighter than the original query that extracts the data.

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:\[WinDir]\Microsoft.NET\Framework\[Version] 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 AspNet

If you re writing an application intended for distribution to a wider audience, it s important to be compatible with as many installations of Django as possible. Since Django itself supports Python as far back as version 2.3, take care when using decorators in views for these distributed applications. Although it may be convenient to use the newer, @-style syntax for applying decorators, that syntax was introduced in Python 2.4, so applications using it won t be compatible with Python 2.3. Therefore, all applications intended for distribution should use the older syntax unless there are other reasons the application can t be supported under Python 2.3. This suggestion may seem obvious while reading this section, with its discussion of the difference between Python 2.3 and Python 2.4, but it s an easy mistake to make and a simple way to break a distributed application s compatibility with various other sites.

You ll see aspnet_regsql used throughout this book. It s required to create the tables for other new ASP.NET 2.0 features such as membership, profiles, and role management.

When you take this step, a new table named SqlCacheTablesForChangeNotification is added to the database named AspNet (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, a record is written into this table. The SQL Server polling 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 materially increasing the polling overhead. Figure 11-7 shows an overview of how SQL Server 2000 cache invalidation works.

Figure 11-7. Monitoring a database for changes in SQL Server 2000 The aspnet_regsql utility adds several stored procedures to the database, as listed in Table 11-5. Table 11-5. Stored procedures for managing notifications

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