DOCUMENT:Q177593  08-DEC-1997  [vbwin]
TITLE   :PRB: Reuse of rdoQuery Object Causes "40006" Unexpected Error
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:WINDOWS:5.0
OPER/SYS:WINDOWS
KEYWORDS:vb5all kberrmsg

======================================================================
---------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Visual Basic Enterprise Edition for Windows, version 5.0
---------------------------------------------------------------------

SYMPTOMS
========

In Visual Basic 5.0, when trying to reuse an rdoQuery object by setting a
new SQL statement to the .SQL property without closing the corresponding
resultset, the following error may result:

   Run-time error '40006':
   An unexpected error occurred.

CAUSE
=====

Because the resultset is tied to the rdoQuery object that was used to
create it, the corresponding resultset must be closed before resetting the
rdoQuery.SQL property.

STATUS
======

This behavior is by design.

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

SQL Server and Pubs sample database is used here.

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

1. Start a new project in Visual Basic and choose "Standard EXE." Form1 is
   created by default.

2. From the Project menu, select References, and then place a check next
   to Microsoft Remote Data Object 2.0.

3. Add a CommandButton to Form1, Command1 is created by default.

4. Paste the following code into the code window of Form1:

      Private Sub Command1_Click()

         Dim cn As New rdoConnection
         Dim qd As New rdoQuery
         Dim rs As rdoResultset

         cn.Connect = "Driver={SQL Server};Server=MyServer;UID=sa;PWD=;" _
         & "Database=pubs;"

         cn.EstablishConnection

         Set qd.ActiveConnection = cn

         qd.SQL = "Select title_id, title From Titles"

         Set rs = qd.OpenResultset(rdOpenForwardOnly, rdConcurReadOnly, _
         rdExecDirect)

         Debug.Print rs(0)

         ' *** Uncomment rs.close line to avoid 40006 error
         'rs.Close
         ' ***

         qd.SQL = "Select au_id, au_lname From Authors"
         Set rs = qd.OpenResultset(rdOpenForwardOnly, rdConcurReadOnly)

         Debug.Print rs(0)

      End Sub

5. Note that you must change your Server, UID, and PWD parameters in the
   connect string.

6. Start the program or press the F5 key.
======================================================================
Keywords          : vb5all kberrmsg
Version           : WINDOWS:5.0
Platform          : WINDOWS
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1997.