KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q177593: PRB: Reuse of rdoQuery Object Causes "40006" Unexpected Error

Article: Q177593
Product(s): Microsoft Visual Basic for Windows
Version(s): 
Operating System(s): 
Keyword(s): kbGrpDSVBDB
Last Modified: 09-JAN-2000

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

- Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 
-------------------------------------------------------------------------------

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.

Additional query words: kbVBp500 kbVBp600 kbVBp kbdse kbDSupport kbRDO

======================================================================
Keywords          : kbGrpDSVBDB 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVB500 kbVB600
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.