Microsoft KB Archive/199131

= How to add a Visual FoxPro database to SQL Server as a linked server =

Article ID: 199131

Article Last Modified on 2/24/2005

-

APPLIES TO


 * Microsoft Visual FoxPro 3.0b for Macintosh
 * Microsoft Visual FoxPro 3.0 Standard Edition
 * Microsoft Visual FoxPro 3.0b Standard Edition
 * Microsoft Visual FoxPro 5.0 Standard Edition
 * Microsoft Visual FoxPro 5.0a
 * Microsoft Visual FoxPro 6.0 Professional Edition
 * Microsoft SQL Server 7.0 Standard Edition
 * Microsoft Visual FoxPro 7.0 Professional Edition
 * Microsoft Visual FoxPro 8.0 Professional Edition
 * Microsoft Visual FoxPro 9.0 Professional Edition

-



This article was previously published under Q199131



SUMMARY
SQL Server 7.0 and SQL Server 2000 allows the addition of external data sources as linked servers. This feature provides access to distributed, heterogeneous queries against OLE DB data sources. This article shows how to programmatically add and query a Visual FoxPro data source as a linked server from Visual FoxPro.



MORE INFORMATION
sp_addlinkedserver is a new stored procedure introduced in SQL Server 7.0 and SQL SErver 2000. sp_addlinkedserver creates a linked server, which allows access to distributed, heterogeneous queries against OLE DB data sources.

The syntax for adding a linked server from Transact - SQL is: sp_addlinkedserver [@server =] 'server', [@srvproduct =] 'product_name', [@provider =] 'provider_name', [@datasrc =] 'data_source', [@location =] 'location', [@provstr =] 'provider_string', [@catalog =] 'catalog'

[@server =] 'server'           Is the name of the linked server to                                   create with sp_addlinkedserver.

[@srvproduct =] 'product_name' Is the product name of the OLE DB data source to add as a linked server.

[@provider =] 'provider_name'  Is the unique provider identifier of the OLE DB provider corresponding to the data source.

[@datasrc =] 'data_source'     Is the name of the data source, as                                   interpreted by the OLE DB provider.

[@location =] 'location'       Is the location of or path to the database as interpreted by the OLE DB                                  provider.

[@provstr =] 'provider_string' Is the OLE DB provider-specific.

[@catalog =] 'catalog'         Is the catalog to be used when making a                                   connection to the OLE DB provider. The following code snippet adds the Visual FoxPro database Testdata.DBC from the SAMPLES\DATA directory to SQL Server as a linked server. This code snippet assumes that Visual FoxPro and SQL Server are being run on the same machine.

Note The user,, must have permissions to perform these operations on the database. Source_Path=IIF(VAL(SUBSTR(VERSION,15,2))=6,HOME(2),HOME+"SAMPLES\") Connect_String='DRIVER={SQL Server};' + ; 'SERVER=MY_SERVER;DATABASE=PUBS;UID=UserName;PWD=StrongPassword' gnConnHandle=SQLSTRINGCONN(Connect_String) IF gnConnHandle > 0 * Create a command string to pass to SQL Server via SQLExec SQLCommand="sp_addlinkedserver 'VFP','','MSDASQL',NULL,NULL,"+ ; "'DRIVER={Microsoft Visual FoxPro Driver};" + ; "SourceDB="+Source_Path+"DATA\TESTDATA.DBC;SourceType=DBC;NULL'" * CREATE the LINKED Server"     Create_Linked_Server=SQLExec(gnConnHandle,SQLCommand)      IF Create_Linked_Server > 0         * The linked server was successfully created         * Run the query         =RunQuery      ELSE         * The Linked Server either already exists or the command failed.         * Test for existence of linked server with aerror         =AERROR(s_failed)         IF "VFP' ALREADY EXISTS."$UPPER(s_failed[1,2])            * The linked server exists, so run the query            =RunQuery         ELSE            * The linked server doesn't exist, so display a message            =MESSAGEBOX(s_failed[1,2],32,'Failed')         ENDIF      ENDIF      =SQLDISCONN(gnConnHandle)   ENDIF

PROCEDURE RunQuery SQLCommand="SELECT * FROM OPENQUERY(VFP,'SELECT * FROM CUSTOMER')" QRYVal=SQLExec(gnConnHandle,SQLCommand,'SQLRESULTS') IF QRYVal > 0 SELECT SQLResults BROW ELSE =AERROR(L_Server) =MESSAGEBOX(L_Server[1,2],32,'Query Failed') ENDIF RETURN After running the code snippet, open SQL Server Enterprise Manager and expand the Linked Servers node. Note that a linked server named VFP has been added.

