Data Source Properties (OLE DB)
SQL Server Native Client (SNAC) is not supported beyond SQL Server 2012. Avoid using SNAC in new development work, and plan to modify applications that currently use it. The Microsoft ODBC Driver for SQL Server provides native connectivity from Windows to Microsoft SQL Server and Microsoft Azure SQL Database.
The SQL Server Native Client OLE DB provider implements data source properties as follows.
|DBPROP_CURRENTCATALOG||R/W: Read/write Default: None|
Description: The value of DBPROP_CURRENTCATALOG reports the current database for a SQL Server Native Client OLE DB provider session. Setting the property value has the identical effect as setting the current database by using the Transact-SQL USE database statement.
Beginning with SQL Server 2005, if you call sp_defaultdb and specify the database name in lower case, even if the database was originally created with a mixed case name, DBPROP_CURRENTCATALOG will return the name in lower case. With previous versions of SQL Server, DBPROP_CURRENTCATALOG will return the expected mixed case.
|DBPROP_MULTIPLECONNECTIONS||R/W: Read/write Default: VARIANT_FALSE|
Description: If the connection is running a command that does not produce a rowset or produces a rowset that is not a server cursor and you execute another command, a new connection will be created to execute the new command if DBPROP_MULTIPLECONNECTIONS is VARIANT_TRUE.
The SQL Server Native Client OLE DB provider will not create another connection if DBPROP_MULTIPLECONNECTION is VARIANT_FALSE or if a transaction is active on the connection. The SQL Server Native Client OLE DB provider returns DB_E_OBJECTOPEN if DBPROP_MULTIPLECONNECTIONS is VARIANT_FALSE and returns E_FAIL if there is an active transaction. Transactions and locking are managed by SQL Server on a per connection basis. If a second connection is generated, the commands on the separate connections do not share locks. To ensure that one command does not block another, hold locks on rows requested by the other command. This also holds true when creating multiple sessions.
Each session has a separate connection.
In the provider-specific property set DBPROPSET_SQLSERVERDATASOURCE, the SQL Server Native Client OLE DB provider defines the following additional data source properties.
|SSPROP_ENABLEFASTLOAD||R/W: Read/write Default: VARIANT_FALSE|
Description: To enable bulk copy from memory, SSPROP_ENABLEFASTLOAD property should be set to VARIANT_TRUE. With this property set on the data source, the newly created session allows consumer access to the IRowsetFastLoad interface.
If the property is set to VARIANT_TRUE, IRowsetFastLoad interface is available through IOpenRowset::OpenRowset by requesting the IID_IRowsetFastLoad interface or by setting SSPROP_IRowsetFastLoad to VARIANT_TRUE.
|SSPROP_ENABLEBULKCOPY||R/W: Read/write Default: VARIANT_FALSE|
Description: To enable bulk copy from files, SSPROP_ENABLEBULKCOPY property should be set to VARIANT_TRUE. With this property set on the data source, consumer access to the IBCPSession interface is available under the same level as Sessions.
SSPROP_IRowsetFastLoad must also be set to VARIANT_TRUE.