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In addition to the data providers that ship from Microsoft (as well as Oracle s custom .NET library), numerous third-party data providers exist for various open source and commercial databases. While you will most likely be able to obtain an ADO.NET data provider directly from the database vendor, you should be aware of the following site: www.sqlsummit.com/DataProv.htm. This web site is one of many sites that document each known ADO.NET data provider and provide links for more information and downloads. Here you will find numerous ADO.NET providers, including SQLite, IBM DB2, MySQL, PostgreSQL, TurboDB, Sybase, and many others. Given the large number of ADO.NET data providers, the examples in this book will use the Microsoft SQL Server data provider (System.Data.SqlClient.dll). Recall that this provider allows you to communicate with Microsoft SQL Server version 7.0 and higher, including SQL Server Express Edition. If you intend to use ADO.NET to interact with another DBMS, you should have no problem doing so once you understand the material presented in the pages that follow.

// Now you can run queries using db_query(). $result = db_query('SELECT title FROM {node}'); ...

In addition to the .NET namespaces that define the types of a specific data provider, the .NET base class libraries provide a number of additional ADO.NET-centric namespaces, some of which you can see in Table 21-3 (again, 24 will address the assemblies and namespaces specific to Entity Framework). Table 21-3. Select Additional ADO.NET-Centric Namespaces

This namespace provides types that facilitate CLR and SQL Server 2005 and later integration services. This namespace defines the core ADO.NET types used by all data providers, including common interfaces and numerous types that represent the disconnected layer (e.g., DataSet and DataTable). This namespace contains types shared between all ADO.NET data providers, including the common abstract base classes. This namespace contains types that allow you to discover Microsoft SQL Server instances installed on the current local network. This namespace contains native data types used by Microsoft SQL Server. You can always use the corresponding CLR data types, but the SqlTypes are optimized to work with SQL Server (e.g., if your SQL Server database contains an integer value, you can represent it using either int or SqlTypes.SqlInt32).

Caution Drupal is often configured to have multiple folders in the sites directory so that the site can be moved from staging to production without changing database credentials. For example, you might have sites/staging. example.com/settings.php with database credentials for your testing database server and sites/www. example.com/settings.php with database credentials for your production database server. When establishing a database connection as shown in this section, Drupal will always use sites/default/settings.php, because there is no HTTP request involved.

Note that this chapter does not examine every type within every ADO.NET namespace (that task would require a large book all by itself); however, it is quite important that you understand the types within the System.Data namespace.

Of all the ADO.NET namespaces, System.Data is the lowest common denominator. You cannot build ADO.NET applications without specifying this namespace in your data access applications. This namespace contains types that are shared among all ADO.NET data providers, regardless of the underlying data store. In addition to a number of database-centric exceptions (e.g., NoNullAllowedException, RowNotInTableException, and MissingPrimaryKeyException), System.Data contains types that represent various database primitives (e.g., tables, rows, columns, and constraints), as well as the common interfaces implemented by data provider objects. Table 21-4 lists some of the core types you should be aware of. Table 21-4. Core Members of the System.Data Namespace

Represents a constraint for a given DataColumn object. Represents a single column within a DataTable object. Represents a parent/child relationship between two DataTable objects. Represents a single row within a DataTable object. Represents an in-memory cache of data consisting of any number of interrelated DataTable objects. Represents a tabular block of in-memory data. Allows you to treat a DataTable as a fire-hose cursor (forward only, readonly data access). Represents a customized view of a DataTable for sorting, filtering, searching, editing, and navigation. Defines the core behavior of a data adapter object. Defines the core behavior of a parameter object. Defines the core behavior of a data reader object. Defines the core behavior of a command object.