BUG: RDO LastModified Is Not Consistent After Moving EOF

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, versions 5.0, 6.0

SYMPTOMS

When you open an RDO resultset in Visual Basic, if the resultset is positioned at the EOF before issuing an AddNew and Update, the LastModified is the bookmark of the first item in the resultset instead of the newly added item. If the resultset is not positioned at the EOF before the Addnew and Update, the LastModified property correctly points to the newly added record.

RESOLUTION

You can avoid this problem by not positioning the resultset at the EOF before issuing the Addnew and Update methods.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

1. Start a new Visual Basic 6.0 Standard EXE project.



2. From the Project menu, click References. Select Microsoft Remote Data Object 2.0 and click OK.



3. Add a CommandButton to the default form and paste the following code into the CommandButton Click event.
   
   NOTE: You may need to alter the connection information to allow you to connect to your database.

   Sample Code

   
         Private Sub Command1_Click()
   
          Dim Conn As New rdoConnection
          Dim CSt As String
          Dim rs As rdoResultset
          Dim sSQL As String
          Dim i As Long
   
          With Conn
                .CursorDriver = rdUseServer
                .Connect = "DRIVER={sql server};SERVER=yourserverhere;" & _
                  "DATABASE=pubs;UID=sa;PWD="
                .EstablishConnection
          End With
          sSQL = "SELECT * FROM titles where pub_id = '0877'"
          Set rs = Conn.OpenResultset(Name:=sSQL, Type:=rdOpenKeyset, _
                       LockType:=rdConcurRowVer, Options:=rdExecDirect)
   
          Conn.BeginTrans
          '  If the resultset was at EOF before the AddNew and Update,
          '  LastModified will be the bookmark of the first item in
          '  the resultset. For instance, the following pubdates will
          '  be the same. If the resultset is not at EOF, the first
          '  pubdate will be the date of the newly added row.
   
          rs.MoveLast  '<<- These lines cause
          rs.MoveNext  '<<- the problem.
   
          Debug.Print rs.EOF
          With rs
              .AddNew
              rs("pub_id") = "0877"
              rs("title_id") = "MC7769"
              rs("title") = "Test Title"
              rs("type") = "business"
              rs("price") = 2.99
              rs("advance") = 5000
              rs("pubdate") = "01/01/98"
              .Update
   
              If .Bookmarkable Then
                  .Bookmark = .LastModified
                  'The following prints the pubdate of the
                  'first record in the resultset.
                  Debug.Print "Pub date (last modified)= " _
                      & rs("title_id")
                  Debug.Print "Bookmark = " & .Bookmark
                  'If you do a MoveLast here, you can get
                  'to the newly added record.
                  .MoveLast
                  Debug.Print "Pub date (move last) = " _
                      & rs("title_id")
                  Debug.Print "Bookmark = " & .Bookmark
                  'The following produces the same as
                  'the LastModified bookmark.
                  .MoveFirst
                  Debug.Print "Pub date = (move first) " _
                      & rs("title_id")
                  Debug.Print "Bookmark = " & .Bookmark
              End If
          End With
          Conn.RollbackTrans
   
         End Sub
    




4. Run this project and click on the CommandButton. You should see that the LastModified property points to the first record in the resultset. If you comment out the lines labeled "These lines cause the problem," then you get the correct value from the LastModified property.

Keywords : kbcode kbVBp500bug kbVBp600bug kbGrpVBDB
Version : WINDOWS:5.0, 6.0
Platform : WINDOWS
Issue type : kbbug