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CHAPTER
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any features are available in managed code that you can put to use in the data access layer don t pertain directly to the Managed Providers of data access. In ASP .NET 2.0, a new set of controls enables you to use the markup of your ASPX page to declaratively bind a control to a data source. These are called the data source controls, and they are very advanced compared to the data-binding engine available in 1.x. Microsoft has also added one of the most requested features to the cache object: the capability to establish a dependency between a cache entry and a database table. This dramatically increases the usefulness of the cache, making it as dependable for purging dirty data as it always has been for XML documents. There s also a data access layer application block available from Microsoft, which simplifies a lot of the common tasks that need to be done within a data access layer. While this does not ship with the .NET Framework, it is available as a free download from Microsoft. We ll take a look at all of these features in this chapter. We ll wrap up with a preview of SQL Server 2005.
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Declarative Data Access
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ASP.NET 2.0 adds a suite of controls to the Framework called data source controls. These controls keep in line with Microsoft s migration from imperative code to declarative code. Data source controls allow data to be retrieved from a variety of sources using nothing but markup in the body of the ASPX page. If you re having flashbacks to the days of IDC and HTX, you re not entirely off base, but these controls are extremely flexible and powerful. Another benefit of the markup approach to declarative coding is that the XML DOM is much easier to use than the CodeDOM, and so there s really impressive support for these controls from within the Visual Studio IDE graphical editors. These tools generate the markup, exposing an interface that allows for some powerful expressions to be created without writing any code. Still, as architects, our hunch is that you ll look at some of these tools and wince a little on the inside. They demo really well at the conferences, but for a lot of people, there s something about embedding data access code into markup that just somehow seems wrong. Data access belongs in a different logical layer of the application, and presentation code belongs in markup. This opinion may change over time, and XML Application Markup Language (XAML) may bring about changes in the way people think about coding and markup. But these are changes that may take many years to take hold, and, in the meantime, if these controls don t live up to their promise, they could undermine any eventual adoption of this model. So we ll take a look at the data access controls in the first part of this chapter, drilling specifically into the SqlDataSource and ObjectDataSource controls (see Table 11-1). They may not represent the end of writing code to get to data sources, but in many cases they are a great
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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way to dramatically speed a development effort. The ObjectDataSource adheres to a layered architecture better, whereas the SqlDataSource may prove itself suitable only for prototyping and quick fixes. Table 11-1. Data Source Controls in ASP .NET 2.0
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AccessDataSource ObjectDataSource SitemapDataSource SqlDataSource XmlDataSource
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Enables you to declaratively bind to an Access database file (MDB). Enables you to bind to an object model. Specialized XML format that describes the structure and hierarchy of your site. Used for binding to the site navigation controls. Allows for binding to relational data sources. Used to bind to an XML document.
None of these controls has visible rendering behaviors of its own. They can more logically be thought of as components rather than controls, but in order to avoid having to write code (as is common with components), they re implemented as controls. When you re using a data source control, the creation of the interface is done by one of the new Web Controls that inherits from the DataBoundControl base class (or HierarchicalDataBoundControl) listed in Table 11-2. Table 11-2. DataBoundControls in ASP .NET 2.0
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