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ADO.NET relies on the functionality in a small set of core classes. You can divide these classes into two groups: those that are used to contain and manage data (such as DataSet, DataTable, DataRow, and DataRelation) and those that are used to connect to a specific data source (such as Connection, Command, and DataReader). The data container classes are completely generic. No matter what data source you use, once you extract the data, it s stored using the same data container: the specialized DataSet class. Think of the DataSet as playing the same role as a collection or an array it s a package for data. The difference is that the DataSet is customized for relational data, which means it understands concepts such as rows, columns, and table relationships natively. The second group of classes exists in several different flavors. Each set of data interaction classes is called an ADO.NET data provider. Data providers are customized so that each one uses the best-performing way of interacting with its data source. For example, the SQL Server data provider is designed to work with SQL Server 7 or later. Internally, it uses SQL Server s TDS (tabular data stream) protocol for communicating, thus guaranteeing the best possible performance. If you re using Oracle, you ll need to use the Oracle provider classes instead.

which can aid in debugging, as it is sometimes difficult or impossible to debug distributed, remote, or multithreaded applications. Logging can also be used for auditing purposes. JavaScript development has long been hampered by its lack of quality development tools and libraries. How many of us have debugged JavaScript by peppering the code with alert statements Certainly this gets the job done, but the problem with alert statements is that they must be removed before the application is released to the general public. Adding a host of alert statements only to have to remove them later can be tedious and error-prone. New tools are becoming available that bring log4j-like capabilities to JavaScript. The next few sections review these tools and give a brief overview of their use.

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It s important to understand that you can use any data provider in almost the same way, with almost the same code. The provider classes derive from the same base classes, implement the same interfaces, and expose the same set of methods and properties. In some cases, a data provider object will provide custom functionality that s available only with certain data sources, such as SQL Server s ability to perform XML queries. However, the basic members used for retrieving and modifying data are identical. .NET includes the following four providers: SQL Server provider: Provides optimized access to a SQL Server database (version 7.0 or later) OLE DB provider: Provides access to any data source that has an OLE DB driver Oracle provider: Provides optimized access to an Oracle database (version 8i or later) ODBC provider: Provides access to any data source that has an ODBC (Open Database Connectivity) driver In addition, third-party developers and database vendors have released their own ADO.NET providers, which follow the same conventions and can be used in the same way as those that are included with the .NET Framework. When choosing a provider, you should first try to find one that s customized for your data source. If you can t find a suitable provider, you can use the OLE DB provider, as long as you have an OLE DB driver for your data source. The OLE DB technology has been around for many years as part of ADO, so most data sources provide an OLE DB driver (including SQL Server, Oracle, Access, MySQL, and many more). In the rare situation that you can t find a full provider or an OLE DB driver, you can fall back on the ODBC provider, which works in conjunction with an ODBC driver.

Summary

s Microsoft includes the OLE DB provider with ADO.NET so you can use your existing OLE DB drivers. Tip

However, if you can find a provider that s customized specifically for your data source, you should use it instead. For example, you can connect to SQL Server database using either the SQL Server provider or the OLE DB provider, but the first approach will perform best.

To help understand the different layers that come into play with ADO.NET, refer to Figure 15-8.

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