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OPENROWSET and OPENDATASOURCE
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The OPENROWSET and OPENDATASOURCE commands can be used to connect to remote data sources They both depend on the existence of OLE DB providers that provide the framework for the connection Both OPENROWSET and OPENDATASOURCE appear as functions (and are referred to as functions), though internally they work as macros The limitation is that we can t pass T-SQL variables into them as we can with regular functions
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These commands would be used for connections that occur infrequently If the queries needed to be executed more than a few times (and there aren t any specific restrictions against doing so), we would typically create a linked server, as described in 11 For both to work, we would need to enable the feature using the SQL Server 2005 Surface Area Configuration tool, Surface Area Configuration for Features We can see it enabled in Figure 15-31
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Figure 15-31 Enabling OPENROWSET and OPENDATASOURCE
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OPENROWSET
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The OPENROWSET function can be used to connect to non-Microsoft SQL Server remote data sources and to access data from those data sources It uses an OLE DB provider As long as we have a provider for the remote database (and we have the permissions), we can connect and access the data As a function, OPENROWSET works like other functions Since the result of the function is in a table format, we can include the OPENROWSET function in statements that expect a table, such as within VIEWs or SELECT statements The basic syntax of the OPENROWSET function is:
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OPENROWSET ( { 'provider_name' , { 'datasource' ; 'user_id' ; 'password' | 'provider_string' } , { [ catalog ] [ schema ] object | 'query' } } )
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OLE DB providers are available for many Microsoft products (such as other SQL Servers or Access databases) and many non-Microsoft products (such as Oracle or IBM s DB2) Let s say we had an Access database named Sales that had a Customers table we wanted to query The OLE DB provider for a Microsoft Access database is MicrosoftJet OLEDB40 The following query could be executed against SQL Server As long as the path of the Salesmdb database was correct, we d get our result set
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SELECT * FROM OPENROWSET('MicrosoftJetOLEDB40', 'C:\data\Salesmdb'; 'admin';'',Customers)
TIP Remember, the OPENROWSET function is disabled by default In order for this statement to run, you need to enable OPENROWSET and OPENDATASOURCE statements in the SQL Server Surface Area Configuration tool This setting is found in the Ad Hoc Remote Queries section The OPENROWSET function can also be used to bulk import XML data An XML file can be imported into a single column using the varbinary(max) data type
OPENDATASOURCE
The OPENDATASOURCE command is used to provide ad hoc connection information as part of a four-part object name without using a linked server name When linked servers are restricted as part of a business requirement, the command can be used to make the connection and get the required data For example, if persistent connections aren t allowed between servers, you can use the OPENDATASOURCE statement instead of creating linked servers Remember the four-part name is serverdatabaseschemaobject If we had created a linked server, we could include the four-part name within our query However, without a linked server defined, we substitute the server portion of the four-part name with the OPENDATASOURCE function The basic syntax is:
OPENDATASOURCE ( provider_name, init_string )
Different OLE DB providers have different string requirements Let s take a look at the function in the context of a SELECT statement The following statement will allow us to connect to a named instance (MyNamedInstance) on a remote SQL Server named MCTIP1 using the SQL provider ( SQLNCLI ):
SELECT * FROM OPENDATASOURCE('SQLNCLI', 'Data Source=MCITP1\MyNamedInstance;Integrated Security=SSPI') AdventureWorksPersonContact
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