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This chapter looked at the ways that you can implement caching across your application and your enterprise in a consistent and configurable way by using the Caching Application Block. The block provides a non-distributed cache that can cache items in memory, and optionally in a persistent backing store such as isolated storage or a database. You can also easily add new backing stores if required, and even replace the cache manager if you want to create a mechanism that does support other features, such as distributed caching. The Caching block is flexible in order to meet most requirements for most types of applications. You can define multiple caches and partition each one, which is useful if you want to use a single database for multiple caches. And you can easily add encryption to the caching mechanism for items stored in a persistent backing store. The block also provides a wide range of expiration mechanisms, including several time-based expirations as well as file-based expiration. Unlike some caching mechanisms, you can specify multiple expirations for each cached item, and even create your own custom expiration policies. On top of all of this flexibility, the block makes it easy for administrators and operators to change the behavior through configuration using the configuration tools provided with Enterprise Library. They can change the settings for the cache, such as the polling frequency, change the backing stores that the block uses, and change the algorithms that it uses to encrypt cached data. This chapter discussed all of these features, and contained detailed examples of how you can use the block in your own applications. For more information about the Caching block, see the online documentation and the help files installed with Enterprise Library.

Often you will want code to run when a user initiates a session or when a session is terminated. For example, you might want to initialize key variables when a session starts, or you might want to do some user-specific logging. You can trap session events by using the Global.asax file (as discussed in the previous section). There are two special events that ASP.NET provides for responding to session activities:

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Let s summarize and generalize our investigation of parallel plans on partitioned tables in SQL Server 2005 and 2008. In SQL Server 2005, for queries that access partitioned table or index, the parallelism is driven by the partitions. Each individual table or index partition is processed by a separate single thread. Therefore, if there are fewer partitions than degree of parallelism, some of the parallel threads will end up idle. That was the case with accessing only three partitions on an eight-core machine. On the other hand, if there are more partitions, some will be processed only after one of the previous partitions has been handled. But at most, one thread is always active on one partition at a time. There is a signi cant exception to this rule: If SQL Server 2005 knows at compile time that only a single partition of partitioned table is accessed, a fully parallel plan is considered and potentially generated exactly as if accessing a nonpartitioned table. The at compile time exception is important when designing your queries using parameters in SQL Server 2005. For example, if instead of the existing WHERE clause in the query in Listing 11-4

BEGIN TRAN UPDATE dbo.T1 SET col2 = col2 + 'A' WHERE col1 = 101;

Figure 4-22. If the exclamation point pending icon is displayed, the publication date is set sometime in the future.

You can use triggers to enforce complex integrity rules, to maintain denormalized data, and to do much more .

Table 6-4: XPathNavigator Move Methods Method Description namespace node is the prefix. MoveToNext Moves to the next sibling of the current node. MoveToNextAttribute MoveToNextNamespace MoveToParent MoveToPrevious MoveToRoot Moves to the next attribute of the current node. Moves to the next namespace in the current element node. Moves to the parent of the current node. Moves to the previous sibling of the current node. Moves to the root node of the document.

Because the C# compiler has built-in support for events, the compiler translates the use of the += operator into the following line of code to add the object s interest in the event:

In general, there is nothing specific that you need to do at runtime to access your application resources, other than provide a path to a resource file in the same way you d provide a path to a file on the file system. The path to a resource always begins with a colon, like this: ":/images/map.jpg". You can provide a resource path to any API that takes a file path, including not just QFile, but other classes, such as QPixmap, which loads an image as a map of pixels (we ll have more to say about QPixmap in the next section, Implementing a Custom Widget ). For example, here s a snippet from the implementation of a custom widget that loads an image from the application resource and draws it:

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USE tempdb; GO IF OBJECT_ID('dbo.T1') IS NOT NULL DROP TABLE dbo.T1; GO CREATE TABLE dbo.T1 ( keycol INT NOT NULL PRIMARY KEY, datacol VARCHAR(10) NOT NULL ); INSERT INTO dbo.T1(keycol, datacol) VALUES(1, INSERT INTO dbo.T1(keycol, datacol) VALUES(2, INSERT INTO dbo.T1(keycol, datacol) VALUES(3, INSERT INTO dbo.T1(keycol, datacol) VALUES(4, INSERT INTO dbo.T1(keycol, datacol) VALUES(6, INSERT INTO dbo.T1(keycol, datacol) VALUES(7,

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