Q186196: PRB: Jet ODBC Driver Error 40002: Operation Invalid at This Time

Article: Q186196
Product(s): Microsoft Visual Basic for Windows
Version(s): 
Operating System(s): 
Keyword(s): kbGrpDSVBDB
Last Modified: 09-JAN-2000

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The information in this article applies to:

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

Using RDO and transactions against the Microsoft Access ODBC driver results in
the following error message:

  Run-time error '40002':

  S1011:[Microsoft][ODBC Microsoft Access 97 Driver]Operation invalid at this
  time

CAUSE
=====

The ODBC driver does not support transactions on a connection that has open
Resultsets. The Resultset must be opened and closed within the scope of the
transaction.

RESOLUTION
==========

There are three resolutions:

1. Choose a different back-end database whose ODBC driver does not have this
  limitation.

2. Use DAO instead of RDO.

3. Rewrite the code to avoid this limitation.

STATUS
======

This behavior is by design.

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

The Microsoft Access ODBC driver does not preserve cursors across transaction
boundaries. This means that open Resultsets must be closed before entering or
exiting the scope of a transaction. This is a limitation in the design of the
ODBC driver.

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

1. Use the ODBC Administrator in the Control Panel to add a DSN called NWIND for
  the Microsoft Access ODBC driver pointing to the Northwind sample database.

2. Create a standard EXE project in Visual Basic. Form1 is created by default.

3. Add a Project Reference to Microsoft Remote Data Object 2.0.

4. Add a CommandButton (Command1) to the default form.

5. Add the following code to the form:

        Option Explicit

        Private Sub Command1()
        Dim cn As rdoConnection, rs As rdoResultset, SQL As String
          Set cn = RDOEngine(0).OpenConnection("NWIND", rdDriverNoPrompt, _
                                               False)
          SQL = "SELECT * FROM Customers"
          Set rs = cn.OpenResultset(SQL, rdOpenKeyset, rdConcurRowVer)
          cn.BeginTrans
          rs.Edit
          rs!ContactTitle = "Vice President"
          rs.Update
          cn.CommitTrans
          rs.Close
          cn.Close
        End Sub

6. Run the project and click the CommandButton. The error above will be
  displayed.

7. Move the "cn.BeginTrans" line before the "Set rs =" line, and move the
  "cn.CommitTrans" line after the "rs.Close" line. Re-run the code and it will
  complete without the error.

(c) Microsoft Corporation 1998. All Rights Reserved. Contributions by Malcolm
Stewart, Microsoft Corporation

Additional query words: kbRDO kbODBC kbDAO kbdse kbDSupport kbVBp kbVBp500 kbVBp600 kbDSupport kbdse

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Keywords          : kbGrpDSVBDB 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVB500 kbVB600
Issue type        : kbprb

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