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When the middle tier creates a new business object, the business object creates a new Connection object. When the middle tier releases an existing business object, the business object closes and releases its connection. Generally, the business object will close its connection in its clean-up code. As I mentioned earlier, database connections are expensive. Rather than close the database connection, what if we stored it in a pool? Then, 34 35 when a new business object starts up, it will check the pool for an existing connection.

Some database systems, such as SQL Server, allow you to connect using your network identity. This feature is known by a number of different namesâ network authentication, Windows authentication, Windows NT authentication, or integrated security. Itâ s a fairly simple concept. Rather than relying on the user to specify a username and password, the database asks the network to identify the user. The database then checks its user list to determine whether that user has permission to connect. For more information on using SQL Server with integrated security, look under Administering SQL Server\ Managing Security\ Security Levels\ Authentication Modes in SQL Server Books Online.

Fetching 8 The connection is busy fetching data. NET. Open 1 The connection is open. NET. Currently, the Connection objectâ s State property will return either Open or Closed. Future 46 Value 47 releases might support combinations of these values to indicate that a connection is open but is currently executing a query. You can use the Connection objectâ changes. s StateChange event to determine when the value of the State property Methods of the OleDbConnection Object Table 3-3 lists the OleDbConnection objectâ s methods.

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Microsoft ADO NET. by David Sceppa

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