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Q260526: PRB: Using TOP Clause Returns No Data from SQL 7.0/2000 Table

Article: Q260526
Product(s): Microsoft FoxPro
Version(s): 3.0,3.0b,5.0,5.0a,6.0
Operating System(s): 
Keyword(s): kbODBC kbSQL kbvfp300 kbvfp300b kbvfp500 kbvfp500a kbvfp600 kbSQLServ650 kbSQLServ700 k
Last Modified: 17-JAN-2002

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0 
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SYMPTOMS
========

When using the TOP clause in a SQL SELECT statement that is retrieving data from
a table in a SQL Server 7.0 or SQL Server 2000 database, no data is returned to
Visual FoxPro.

CAUSE
=====

The TOP clause is new to SQL Server 7.0 and SQL Server 2000. The reason that no
data is being returned is that the compatibility mode on the database from which
the data is being retrieved is set to 6.5.

RESOLUTION
==========

Change the compatibility mode of the database to 7.0 or 8.0 (for SQL Server
2000). This allows the correct data to be returned. The different modes for
SP_DBCMPTLEVEL are 60, 65, 70, 80; see SP_DBCMPTLEVEL in SQL Server Books Online
for more information.

STATUS
======

This behavior is by design.

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

Steps to Reproduce Behavior
---------------------------

The compatibility of a SQL Server 7.0 or SQL Server 2000 database can be changed
by using the SP_DBCMPTLEVEL command. For example, you can issue the command
SP_DBCMPTLEVEL pubs, 70 in the SQL Server 7.0 Query Analyzer window, or send it
through the Visual FoxPro ODBC driver using the SQLEXEC command.

Create a program (.prg) file and run the following code, changing the database
name to your database wherever necessary:

  *!* Make changes to the connect string, adding your server, database,
  *!*      login, and password.
  MyConnect_Str = 'DRIVER={SQL Server}; SERVER=YourServer;' + ;
                  'DATABASE=YourDatabase;UID=sa;PWD='
  *!* Connects to SQL Server using the connect string.
  MyHandle = SQLSTRINGCONN(MyConnect_Str)
  IF MyHandle > 0
  *!* Comment out the next line and uncomment the line after to return data.
      Change_Ver = SQLEXEC(MyHandle, "SP_DBCMPTLEVEL pubs, 65") &&Returns Error
  *!* Change_Ver = SQLEXEC(MyHandle, "SP_DBCMPTLEVEL pubs, 70") &&Returns Top 5
     MyExec = SQLEXEC(MyHandle, "SELECT  TOP 5 * FROM authors")
        IF MyExec < 1
           WAIT WINDOW "SELECT statement failed!"
        ELSE
           BROWSE
           USE	
        ENDIF
  ELSE
        WAIT WINDOW "Connection failed!"
  ENDIF 

REFERENCES
==========

For additional information on determining SQL Server Compatibility Levels, click
the article number below to view the article in the Microsoft Knowledge Base:

  Q233508 HOWTO: Determine Compatibility Level of a SQL Server 7 Database

Additional query words:

======================================================================
Keywords          : kbODBC kbSQL kbvfp300 kbvfp300b kbvfp500 kbvfp500a kbvfp600 kbSQLServ650 kbSQLServ700 kbGrpDSFox kbDSupport kbCodeSnippet kbSQLProg 
Technology        : kbVFPsearch kbAudDeveloper kbVFP300 kbVFP300b kbVFP500 kbVFP600 kbVFP500a
Version           : :3.0,3.0b,5.0,5.0a,6.0
Issue type        : kbprb

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