FIX: RDO InfoMessage Event Behavior Different in VB6 and VB5

• Microsoft Visual Basic Enterprise Edition for Windows, version 6.0

SYMPTOMS

When using RDO with Visual Basic 6.0, it is possible to declare the RDOEngine object WithEvents so that you can trap informational messages that are returned from the underlying ODBC driver. These messages will be raised in the RDOEngine_InfoMessage event.

When using RDO in a Visual Basic 6.0 application, you may see additional informational messages being raised through the RDOEngine_InfoMessage event under various circumstances. In these cases this event is being fired incorrectly.

STATUS

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

This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio 6.0 Service Packs, please see the following articles in the Microsoft Knowledge Base:


Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

The following code reproduces this problem. This code assumes that you are using SQL Server as your database. You will need to modify the connection string to point to your SQL Server.

1. Create a new Visual Basic 6.0 Project. Form1 is created by default. Set a reference to the Microsoft Remote Data Object 2.0 library.



2. Add a CommandButton to the default form.



3. Place the following code in the default form:




Dim WithEvents rEngine As rdoEngine
Dim cn As rdoConnection
Const CONNECTSTR = "Driver={SQL Server};Server=(local);database=pubs;uid=sa;pwd="

Private Sub Command1_Click()
    
    Set Query = New rdoQuery
    Query.SQL = "Begin transaction" & vbCrLf & "Rollback transaction"
    Set Query.ActiveConnection = cn
    Query.Prepared = False
    Query.RowsetSize = 1
    Query.Execute               '*** This line causes the informational message ***

End Sub

Private Sub Form_Load()
    
    Set rEngine = RDO.rdoEngine
    Dim Query As rdoQuery
    Set cn = New rdoConnection
    cn.Connect = CONNECTSTR
    cn.EstablishConnection rdDriverNoPrompt
    
End Sub

Private Sub rEngine_InfoMessage()
    
    Dim myerr As rdoError
    For Each myerr In rdoErrors
            Debug.Print myerr.Number & " -- " & myerr.Description
            
    Next

End Sub 

REFERENCES

Visual Basic 6.0 Online Help

Additional query words:

Keywords : kbservicepack kbDatabase kbRDO kbVBp600bug kbVS600sp3fix kbGrpVBDB
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbbug