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One of the underlying principles of the Entity Framework is that you use the objects it provides, and the Entity Framework decides when to perform database queries. This allows the Entity Framework to optimize queries, as you saw in the previous section. However, in some situations it introduces additional complications and in others, it can even reduce performance. The most obvious example is when accessing related data. Once again, the Entity Framework waits until the last possible second to perform its database query. Consider the example shown earlier in Figure 24-11, where your code shows a list of orders grouped by customers. When you begin moving through the Customers collection, the Entity Framework performs a query to select all the customer records. Then, when the inner loop follows the Customer.Orders collection, the Entity Framework performs a second query that selects the orders for that customer. On the next pass, when you access the Customer.Orders collection of the second customer, the Entity Framework performs a third query to select that customer s orders. And the process continues, with a separate order query for each customer. This approach is called lazy loading, and it s perfect for situations where you need to get a small number of linked records (for example, the orders for one or two customers). However, if you plan to examine the orders for every customer (as in this example), it s far less convenient in fact, it multiplies the work the database server needs to do.

In this case, the page is too dynamic to cache or is it The current example sets the VaryByParam attribute on the OutputCache directive to None, which effectively tells ASPNET that you need to store only one copy of the cached page, which is suitable for all scenarios If the request for this page adds query string arguments to the URL, it makes no difference ASPNET will always reuse the same output until it expires You can test this by adding a query string parameter manually in the browser window For example, try tacking a=b on to the end of your URL The cached output is still used Based on this experiment, you might assume that output caching isn t suitable for pages that use query string arguments But ASPNET actually provides another option.

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Instead of automatically calling __autoload() once spl_autoload_register() has been called, calls to undefined classes will end up calling, in order, all the functions registered with spl_autoload_register() The spl_autoload_register() function takes two arguments: a function to add to the autoload stack and whether to throw an exception if the loader cannot find the class The first argument is optional and will default to the spl_autoload() function, which automatically searches the path for the lowercased class name, using either the php or inc extension, or any other extensions registered with the spl_autoload_extensions() function You can also register a custom function to load the missing class Listing 9-13 shows the registration of the default methods, the configuration of file extensions for the default spl_autoload() function, and the registration of a custom loader Listing 9-13 SPL Autoload spl_autoload_register(null,false); spl_autoload_extensions('php,inc,class,.

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