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Data Access Layer
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The third part of the book is about how the data access layer manifests in the .NET Framework.
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Every business application has requirements to retain information across a user s sessions with the application. These requirements are called the persistence requirements for the application. Although there are scores of persistence mediums, one has come to dominate: the relation database server. Relational databases store information using rules described by a schema; these rules are based on the tenets of information theory and are implemented using Structured Query Language, or SQL. It has also become widely accepted that isolating access to this persistence medium yields great benefits in the design and maintenance of complex applications. This isolation layer is called the data access layer.
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The third part of the book starts with an overview of ADO.NET, with a focus not so much on the hows of using a managed provider for data access, but rather on when to use different types and techniques and some best practices for each scenario.
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Several features of the Framework are designed for the data access layer, yet they don t directly pertain to managed providers. We ll examine some of these key services here, including data source controls, database-dependent cache entries, and the data access layer application block. In the last section of this chapter, we ll examine some of the radical new features of SQL Server 2005, which change some of our fundamental suppositions about distributed applications, and force us to learn new ways to think about what runs in-memory with the database engine.
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The next version of the Framework introduces a more elaborate transaction model, enabling you to have a transaction manage work that gets done in memory, so it can be rolled back the same way transactional database work can be. We ll examine this and see how a transaction can start as you make modifications to business objects, and then be promoted to do database work, and get promoted again if the transaction becomes distributed across databases. We ll also show you how to implement your own resource manager, which can do work that will participate in these transactions.
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Managed Providers of Data Access
he data access model that you ve used for your .NET development is called ADO.NET. This is a marketing name, as the technology has very little to do with ADO, and nothing to do with ActiveX (which is what the A in the acronym ADO stands for). A more descriptive name would be Managed Providers of data access. In this chapter, we ve made the assumption that you ve used Managed Providers in your .NET development efforts. We examine some specific techniques for optimizing data access, compare and contrast the data access models available when using Managed Providers, and provide a summary of some of the new features in ADO.NET 2.0. A Managed Provider is really just a set of types that implements a known set of interfaces. ADO and OLEDB, Microsoft s COM-based data access technology, was designed when the client-server model of application development was at its peak. As the Web caused distributed application development to move to the fore, ADO had to be modified to account for architectural differences that worked well in a client server environment, but were not scalable enough for distributed applications. ADO.NET was designed from the ground up for distributed architectures, formalizing a disconnected model of data access into the object model. One of the major drawbacks of working with Recordsets (the type for working with result sets with COM-based ADO) was that it was hard to know in what situations you should use which cursor and locking models. Furthermore, there was very little discernable difference in how the developer interacted with the result set regardless of the cursor model used. In short, it was very easy to use ADO result sets in a way that could negatively impact performance and scalability. A developer needed to understand the internals of the Recordset cursor model in order to choose the cursor and locking models most appropriate in specific circumstances. ADO.NET gives you a choice of how to work with result sets with two different data access models. One is an in-memory model, and the other is a low memory footprint, row-based approach. Each of these models is implemented with different classes, meaning you work with different objects depending on which method you employ. The programming models between the two methods are different, and this makes it clear to the developer which technique he s using. This clear differentiation should reduce the number of times the incorrect model gets used. However, choosing the correct model still requires a clear understanding of the differences, the features, and trade-offs of each one.
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