Q191515: BUG: AbsolutePosition Property Returns Different Results

Article: Q191515
Product(s): Open Database Connectivity (ODBC)
Version(s): 2.5,5.0,6.0,Build 2.573.2927
Operating System(s): 
Keyword(s): kbDatabase kbDriver kbODBC kbOracle _IK12473 kbMDAC250bugkbbuglist
Last Modified: 12-SEP-2001

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The information in this article applies to:

- Microsoft ODBC for Oracle version 2.5 Build 2.573.2927 
- Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 
- Microsoft Data Access Components version 2.5 
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SYMPTOMS
========

When you use the Remote Data Objects (RDO) version 2.0 in either Visual Basic
5.0 or Visual Basic 6.0, with an Oracle 7.x or 8.x database, using the Microsoft
ODBC for Oracle driver, the AbsolutePosition property of the rdoResultset object
produces different results depending on the Cursor location as set by the
CursorDriver property of the rdoConnection or rdoEnvironment object.

Using the rdUseServer cursor library, the AbsolutePosition property reports the
last row in the Resultset. When tested a second time it returns the correct
results based on its setting.

If you use either the rdUseODBC or rdUseClientBatch cursor libraries, the results
returned will always be correct.

NOTE: This code has also been tested against Microsoft SQL Server without error.

RESOLUTION
==========

The workaround is to use a MoveLast on the Recordset or not to use the
CursorDriver properties of rdUseServer or rdUseIfNeeded when the results of the
AbsolutePosition property must be accurate. The CursorDriver properties of
rdUseOdbc and rdUseClientBatch produce accurate AbsolutePosition property
results.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.


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

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

1. Start a new Standard EXE project.

2. From the Project menu, choose References and select "Microsoft Remote Data
  Objects 2.0".

3. Add a Command button to the new form.

4. Paste the following code into the General Declaration section of the form:

NOTE: You must modify the connection settings to match your configuration and
choose a table for the rdoResultset that returns rows. This code uses the sample
Customer table.

        Dim rdEnv As rdoEnvironment
        Dim Cn As New rdoConnection
        Dim Rs As rdoResultset

        Private Sub Command1_Click()
          Rs.AbsolutePosition = 5                   'Or whatever.
          MsgBox Rs.rdoColumns("custid")
        End Sub

        Private Sub Form_Load()

          rdoErrors.Clear
          Set rdEnv = rdoEnvironments(0)

          With Cn
             .CursorDriver = rdUseServer      'The problem cursor.
             '.CursorDriver = rdUseOdbc      'This works OK.
             .Connect = "uid=<MyUID>;pwd=<MyPassword>;dsn=<MyServer>"
             .EstablishConnection rdDriverNoPrompt, False
              rdEnv.rdoConnections.Add Cn
          End With

         Set Rs = Cn.OpenResultset("select custid from customer", _
             rdOpenStatic)

        End Sub

5. Run the project by pressing the F5 key. Click the Command1 button and note
  that the message box returns the value for the last row in the Resultset.
  Click it a second time and notice that the value in the Message box is
  correct for the row referred to by the AbsolutePosition property.

6. Stop the project and uncomment the ".CursorDriver = rdUseOdbc" line and
  comment the ".CursorDriver = rdUseServer" line. Run the project again and
  notice that the message box has the correct values every time you click the
  Command button.

Additional query words:

======================================================================
Keywords          : kbDatabase kbDriver kbODBC kbOracle _IK12473 kbMDAC250bug kbbuglist
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbODBCSearch kbVB500 kbVB600 kbMDACSearch kbMDAC250 kbODBCOracle25732927 kbODBCOracle250Search
Version           : :2.5,5.0,6.0,Build 2.573.2927
Issue type        : kbbug
Solution Type     : kbpending

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