Relational Data Access in Visual Studio .NET

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When dealing with relational data access, you generally follow the same process each time you need to touch the underlying data store to retrieve data or update it You need
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A connection to the data store
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A way to express the query that you are going to perform
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Something to contain any returned results from the query
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The classes defined in ADONET are used to encapsulate the state and behavior associated with each of these steps A key concept with relational data access in NET is that it is based on a disconnected data model Obviously you can't execute a query if you aren't really connected to the database Disconnected data access means that you are expected to open a connection, use that connection to issue a query or a set of queries, and then close the connection You may continue to work with the data resulting from the query for some time on the client At some point in the future, you may reconnect to the database to either issue update queries or to refresh the data you have, but you don't keep a connection open to the database the entire time you are working with the data This makes it a very different data model to work with than legacy database APIs, which typically favored a connected model This is also different from the concept of offline operations of a smart client application Offline capabilities are focused on being able to cache the operational data on the client to allow it to continue to support certain use cases even when not connected to a network Disconnected data access generally assumes you have a network connection available, but that you just aren't keeping database connections open throughout the functioning of your application When dealing with data types in ADONET, there are two kinds of types that you come across: generic data classes and provider-specific classes The generic relational data classes and interfaces implement abstract constructs in the relational modeltables, rows, relations, constraintsand can be used to contain data coming from a variety of data sources These generic data classes are all part of the SystemData namespace, which is the root namespace for ADONET class library constructs For the generic classes to be useful, though, you usually need to be able to connect to a data store and perform the queries that populate the generic data containers or update the underlying data store based on changes in them The classes you use to make that connection and execute queries are the provider-specific classes that reside in child namespaces of SystemData and are specific to each provider Table D1 lists the providers that ship with the NET Framework
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Table D1 Managed Data Providers in the NET Framework
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Data Source Microsoft SQL Server Provider Namespace SystemDataSqlClient Description Contains classes to use for all access to SQL Server These include provider-specific features such as built-in data types, XML query and update capabilities, notifications, managed types as user-defined types, and other features The classes in this namespace support SQL Server versions 7 and later Contains classes to use for access to any data source that exposes an OLE DB provider driver Use this provider for Microsoft Access connectivity One OLE DB provider you cannot use through this is the OLE DB to ODBC bridge Use the ODBC-managed provider directly instead Contains classes to use for access to any data provider that exposes an ODBC driver for data access Contains classes that target the specific capabilities of an Oracle database These classes support Oracle database versions 9i and later However, this is a data provider for Oracle created by Microsoft and isn't intended to be a full-featured provider Oracle has its own full-featured provider that is called the Oracle Data Provider, and this provider should be obtained for any production development against Oracle databases
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