BUG: AbsolutePosition Property Returns Different Results

• Microsoft ODBC for Oracle (Build 2.573.2927), version 2.5
• Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0

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: kbODBC kbOracle kbRDO200 kbDatabase kbDriver

Keywords :
Version : WINDOWS:2.5,5.0,6.0
Platform : WINDOWS
Issue type : kbbug