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In-Process Data Access in SQL Server 2005

Jun 16, 2006

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Developer's Guide to SQL Server 2005, A

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Connections

As already mentioned, when you are at server side and a client executes, you are part of that client’s connection context, which in SQL Server 2005 is exposed by using a special connection string. The SqlConnection object exposes the public methods, properties, and events listed in Table 4-2. (Note that the table doesn’t show members inherited from System.Object.)

Table 4-2: Public Members of SqlConnection

Name	Return Value/Type	Member Type
`Constructor`		Constructor
`Constructor(String)`		Constructor
`BeginTransaction()`	`SqlTransaction`	Method
`BeginTransaction(IsolationLevel)`	`SqlTransaction`	Method
`BeginTransaction(IsolationLevel, String)`	`SqlTransaction`	Method
`BeginTransaction(String)`	`SqlTransaction`	Method
`ChangeDatabase(String)`	`void`	Method
`ChangePassword(String, String)`	`void`	Static Method
`ClearAllPools`	`void`	Static Method
`Close()`	`void`	Method
`CreateCommand()`	`SqlCommand`	Method
`EnlistDistributedTransaction(ITransaction)`	`void`	Method
`EnlistTransaction(Transaction)`	`void`	Method
`GetSchema()`	`DataTable`	Method
`GetSchema(String)`	`DataTable`	Method
`GetSchema(String, String[])`	`DataTable`	Method
`Open()`	`void`	Method
`ResetStatistics`	`void`	Method
`RetrieveStatistics`	`Hashtable`	Method
`ConnectionString`	`String`	Property
`ConnectionTimeout`	`Int32`	Property
`Database`	`String`	Property
`DataSource`	`String`	Property
`FireInfoMessageOnUserErrors`	`Boolean`	Property
`PacketSize`	`Int32`	Property
`ServerVersion`	`String`	Property
`State`	`String`	Property
`StatisticsEnabled`	`Boolean`	Property
`WorkStationId`	`String`	Property
`InfoMessage`	`SqlInfoMessage EventHandler`	Event

You can create only one SqlConnection at a time with the special "context connection=true" string. Attempting to create a second SqlConnection instance will fail, but you can create an "internal" SqlConnection and another external SqlConnection back to the same instance using an ordinary connection string. Opening this additional SqlConnection will start a distributed transaction, however,² because you have multiple SPIDs (SQL Server sessions) possibly attempting to update the same data. There is no way to knit the two sessions together through the ADO.NET API into a single local transaction, however, as you can in an extended stored procedure with sp_bindtoken. You can call the SqlConnection’s Close() method and reopen it, if you like, although it’s unlikely that you ever actually need to do this. Keeping the SqlConnection open doesn’t use any additional resources after you originally refer to it in code.

Although the same System.Data.SqlClient.SqlConnection class is used for both client and server code, some of the features and methods will not work inside the server:

ChangePassword method
GetSchema method
Connection pooling and associated parameters and methods
Transparent failover when database mirroring is used
Client statistics
PacketSize, WorkstationID, and other client information

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