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CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
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The low memory footprint model of data access in ADO.NET provides a row-based approach to processing a result set. With this approach, a single row of data is loaded into memory at a time; you process the data for your specific operation, and then the row is discarded from memory when you move on to the next row. This means the memory consumed on the web server (or the physical tier where the result set is being processed) is minimized to the memory needed to hold a single row of the result set, and that footprint is bounded throughout the processing of the set. This is ideal for operations that are common to web applications such as transforming a result set into an HTML table. The type that provides this functionality is called a data reader. We ll examine data readers in some detail shortly. The in-memory type for processing data is called a DataSet. A DataSet is like a collection of ADO-style Recordsets. The actual type the DataSet carries a collection of is a DataTable. The DataSet provides a complete layer of abstraction between you and the data that you re working with. That is, a DataSet does not know and does not care where its data comes from. It can come from SQL Server, some legacy ODBC source, or even an XML file; the programming model stays the same. There can even be a layer of indirection between the schema used at the database and the schema used in memory by the DataSet. Because all of the data for a DataSet is loaded into memory when a command is executed against the database, more features are available than with a data reader. With a DataSet, you can sort data, modify data, apply filters to the data, even establish relationships between different result sets. DataSets can be stored in the Session, squirreled away in the Web Cache, or marshaled to a client via a Web Method. We ll show you how to put the DataSet through its paces after we delve into the data readers.
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There are many different database vendors with strong offerings on the market. A data access model must be designed to generalize the functionality of a relational database, so that the data access model is relevant regardless of the database of choice. With ADO.NET, you access a specific vendor s database using a Managed Provider of data access specifically created for that vendor. There are also providers implemented that allow backwards compatibility with OLEDB and ODBC. When a vendor decides to create a Managed Provider for .NET Framework users to employ to access their database, they implement a series of interfaces (see Figure 10-1). Since all Managed Providers consist of classes implementing this common set of interfaces, the programming model is the same or very similar, regardless of which vendor s product you re using. These interfaces are what provide the layer of abstraction between the developer and the database. For many providers, this removes a software layer between your code and the database that was present in the ADO model. This can provide better performance, as the types that are used to talk to SQL Server, for example, are coded to communicate directly with that database. For native providers such as SQL Server and Oracle, a layer of abstraction that was present in OLEDB and ODBC has been removed in the ADO.NET model. For backwardscompatibility providers, such as OLEDB and ODBC, no performance gains are realized.
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CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
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Figure 10-1. The interfaces underlying a Managed Provider of data access This gain in performance is at the expense of reuse. In ADO, you could change a connection string and use the same code to access different databases (as long as the SQL statements used were compatible across the systems). This was a model commonly used by software vendors to write applications that could use either SQL Server or Oracle as a backend database, for example. Because each Managed Provider is implemented as a set of different types, to get this type of reuse is a bit trickier in version 1.x of the .NET Framework than it was in ADO (where all you needed to do was change a connection string). Microsoft has acknowledged the need to simplify this type of reuse in certain situations and has introduced a new set of features in 2.0 that addresses this specifically. We ll take a look at these features in the upcoming section on data provider factories. There are many Managed Providers available (see Table 10-1). Microsoft ships several with the Framework, there are open source implementations, and several vendors have written providers for their own products, as well.
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