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This is a set of assemblies from Microsoft designed to streamline, simplify, and supercharge data access code. This application block is in its third shipping version from Microsoft. The first two versions were stand-alone sets of assemblies that provided a generic data access layer. The original version of the Block was one of about a dozen different blocks available from Microsoft, each of which provided functionality covering a different set of requirements. There was a configuration block, an exception handling block, and a logging block, to name a few. Any block could be used in an application when its services were needed. Microsoft s patterns & practices group created the application blocks. The goal of application blocks is to provide production-ready sets of functionality that you can add to your .NET Enterprise applications. Application blocks do not ship with the Framework; you have to download them separately. When you download them, you get all of the source code, the compiled assemblies, and project files for opening them in Visual Studio .NET and modifying them.
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Note For a list of all application blocks and links for downloading, see http://msdn.microsoft.com/
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practices/AppBlocks/default.aspx
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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Problems came about when several application blocks were in use concurrently. Microsoft tested each of the blocks in isolation from one another, but in different combinations, the blocks had a tendency to step on one another s toes. Microsoft decided it would be easier to put them all into a single package, test them together, and just let folks leverage functionality out of specific assemblies as needed. And so the Enterprise Library was born. The official name of this block is now the Enterprise Library Data Access Application Block Version 1.0, even though it s the third version of the block. Seven blocks have been rolled into the Enterprise Library. We discuss Enterprise Library v 1.0, which shipped in January of 2005, here. There will be a new version of the Enterprise Library shipped after the release of version 2.0 of the Framework, one that leverages some of the new Framework features. But if you re still using version 1.1 of the Framework, or until Microsoft ships a new version (as 2.0 will be backwards compatible and so Enterprise Library 1.0 will work with it), this data access layer can really give you a jump start on your data access code, and provide you with a few features that aren t present in the 1.x version of the Managed Providers. Almost any application that accesses a relational database can benefit from this application block. The block results in less boilerplate code that has to be written to execute any command, and it manages opening and closing connections to the database, which maximizes the efficiency of the connection pool and reduces the chances of introducing a connection leak into an application. Code is simpler to maintain, and developers have a common model to use to execute commands against the database, simplifying the learning curve for someone working on an Enterprise suite of applications. The block also introduces an object factory that creates a layer of abstraction between the consumer of the data and the database being used on the back end. This means the same code can use different databases, without any changes to the code. This was one of the biggest features lost in the move from ADO to Managed Providers. The Data Access Application Block restores this functionality for SQL Server, Oracle, and DB2. Since the source code is available, adding support for another Managed Provider is not hard. Instructions are included right in the block s documentation (note that the .NET Framework 2.0 adds this functionality to the Managed Provider model; see provider factories in 10).
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