DOCUMENT:Q207595  27-JUL-2000  [foxpro]
TITLE   :HOWTO: SQL Server 7.0 Distributed Query With FoxPro .dbf Files
PRODUCT :Microsoft FoxPro
PROD/VER:WINDOWS:2.6,2.6a,3.0,3.0b,5.0,5.0a,6.0; winnt:7.0
OPER/SYS:
KEYWORDS:kbDatabase kbOLEDB kbSQLServ kbVC kbvfp300b kbvfp500 kbvfp500a kbvfp600 kbGrpDSFox

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The information in this article applies to:

 - Microsoft FoxPro for Windows, versions 2.6, 2.6a 
 - Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0 
 - Microsoft SQL Server version 7.0 
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SUMMARY
=======

This article demonstrates how to perform a SQL Server distributed query to
retrieve data from FoxPro .dbc and .dbf files.

MORE INFORMATION
================

Microsoft SQL Server version 7.0 provides the ability to perform queries against
OLE DB providers. This is done by using the OpenQuery or OpenRowset Transact-SQL
functions or by using a query with four-part names including a linked-server
name.

For example:

sp_addlinkedserver 'mylinkedserver', 'product_name', 'myoledbprovider',
'data_source','location', 'provider_string', 'catalog'

SELECT * FROM OPENQUERY(mylinkedserver, 'select * from table1')

You should use the Microsoft OLE DB provider for ODBC (MSDASQL) and the Visual
FoxPro ODBC driver to set up a linked server to perform distributed queries
against FoxPro .dbc and .dbf files. Using Jet OLEDB Provider with FoxPro is not
supported.

The following T-SQL code example demonstrates how to set up and use distributed
queries with FoxPro with OpenQuery and OpenRowset functions. It also
demonstrates how to update a remote FoxPro table from SQL Server 7.0. You can
test this code in SQL Query Analyzer after you install the Visual FoxPro ODBC
driver on a SQL Server 7.0 machine. You will need to change the data source
names and path to FoxPro files as appropriate:

   /* OPENROWSET and OPENQUERY examples with VFP via ODBC OLE DB provider */ 

   /* These OPENROWSET examples depend on the sample files VFP98\data\Testdata.dbc
   Modify your code accordingly for differences in location or DBC name */ 

   --====================================================
   -- Using DBC file , read and update
   --====================================================
   -- OPENROWSET DSN-less example

   select * from openrowset('MSDASQL',
   'Driver=Microsoft Visual FoxPro Driver;
   SourceDB=e:\VFP98\data\Testdata.dbc;
   SourceType=DBC',
   'select * from customer where country != "USA" order by country')
   go

   select * from  openrowset('MSDASQL',
   'Driver=Microsoft Visual FoxPro Driver;
   SourceDB=e:\VFP98\data\Testdata.dbc;
   SourceType=DBC',
   'select * from customer where region="WA"')
   go

   Update  openrowset('MSDASQL',
   'Driver=Microsoft Visual FoxPro Driver;
   SourceDB=e:\VFP98\data\Testdata.dbc;
   SourceType=DBC',
   'select * from customer where region="WA"')
   set region = "Seattle" 
   go

   -- check to verify which rows were updated
   select * from  openrowset('MSDASQL',
   'Driver=Microsoft Visual FoxPro Driver;
   SourceDB=e:\VFP98\data\Testdata.dbc;
   SourceType=DBC',
   'select * from customer where region="Seattle"') 
   go

   -- OPENROWSET DSN example
   /* Note the DSN Example might fail if SQL Server is configured to use a local account.*/ 
   select * from openrowset('MSDASQL',
   'DSN=Visual FoxPro Database;
   SourceDB=e:\VFP98\data\Testdata.dbc;
   SourceType=DBC',
   'select * from customer where country != "USA" order by country')
   go

   /* sp_addlinkedserver examples */ 
   -- sp_addlinkedserver example with DSN

   /* You will need to make a DSN and point it to the Testdata database. 
   Modify your code accordingly for differences in location or DBC name */ 

   /* Note this Example may fail if SQL Server is configured to use a local account.*/ 
   sp_addlinkedserver 'VFP Testdata Database With DSN', 
       '', 
       'MSDASQL',
       'VFP System DSN'
   go

   sp_addlinkedsrvlogin 'VFP Testdata Database With DSN', FALSE, NULL, NULL, NULL
   go 

   SELECT *
   FROM OPENQUERY([VFP Testdata Database With DSN], 'select * from customer where region = "Seattle" ') 
   go

   -- Update using OpenQuery
   Update OPENQUERY([VFP Testdata Database With DSN], 'select * from customer where region="WA"') 
   set region = "Seattle" 
   go

   /* SP_addlinkedserver example with DSN-less connection */ 

   /* This example also depends on the sample files Testdata.dbc
   Modify your code accordingly for differences in location or DBC name */ 

   sp_addlinkedserver 'VFP Testdata Database With No DSN', 
       '', 
       'MSDASQL',
       NULL,
       NULL,
   'Driver={Microsoft Visual FoxPro Driver};UID=;PWD=;SourceDB=e:\VFP98\data\Testdata.dbc;SourceType=DBC;Exclusive=No;BackgroundFetch=Yes;Collate=Machine;'
   go

   sp_addlinkedsrvlogin 'VFP Testdata Database With No DSN', FALSE, NULL, NULL, NULL
   go

   SELECT *
   FROM OPENQUERY([VFP Testdata Database With No DSN], 'select * from customer where country != "USA" order by country') 
   go

   --====================================================
   -- Using VFP 6.0 driver, read and update data from VFP sample dbf files
   --====================================================

   -- OPENROWSET DSN-less example

   select * from openrowset('MSDASQL',
   'Driver=Microsoft Visual FoxPro Driver;
   SourceDB=e:\VFP98\data;
   SourceType=DBF',
   'select * from customer where country != "USA" order by country')
   go

   -- perform UPDATE

   Update openrowset('MSDASQL',
   'Driver=Microsoft Visual FoxPro Driver;
   SourceDB=e:\VFP98\data;
   SourceType=DBF',
   'select * from customer where region="Seattle"')
   set region = "WA" 
   go

   -- verify update

   select * from openrowset('MSDASQL',
   'Driver=Microsoft Visual FoxPro Driver;
   SourceDB=e:\VFP98\data;
   SourceType=DBF',
   'select * from customer where region = "WA"')
   go<BR/>

   -- OPENROWSET DSN example
   -- DSN points to the folder where .dbf files are.
   /* Note this Example may fail if SQL Server is configured to use a local account.*/ 
   select * from openrowset('MSDASQL',
   'DSN=Visual FoxPro Tables;			
   SourceDB=e:\VFP98\data;
   SourceType=DBF',
   'select * from customer where country != "USA" order by country') 
   go


REFERENCES
==========

For more details on setting up and using Distributed Queries, take a look at
sp_addlinkedserver, OpenQuery, OpenRowset and related topics in SQL 7.0 Books
Online.

To learn more about FoxPro, and .dbf and .dbc files, refer to the FoxPro product
documentation.


Additional query words:

======================================================================
Keywords          : kbDatabase kbOLEDB kbSQLServ kbVC kbvfp300b kbvfp500 kbvfp500a kbvfp600 kbGrpDSFox 
Technology        : kbVFPsearch kbSQLServSearch kbAudDeveloper kbFoxproSearch kbSQLServ700 kbFoxPro260 kbFoxPro260a kbVFP300 kbVFP300b kbVFP500 kbVFP600 kbVFP500a
Version           : WINDOWS:2.6,2.6a,3.0,3.0b,5.0,5.0a,6.0; winnt:7.0
Issue type        : kbhowto

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