DCount Not Working

Posted on 2010-08-26
Last Modified: 2012-06-21
Hi Experts,
Can you please help me with the following. I don't know why the following code isn't working.

According to the sample data, a msgbox should appear but it doesn't if i were to repeatedly click on the cmdbutton.


Private Sub Command9_Click()

Dim rs As dao.Recordset

Set rs = CurrentDb.OpenRecordset("tblClassMeeting")

    With rs


         !ClassProductID = Me.ClassProductID

         !ClassDate = Me.ClassDate


    End With


Call ClassMeetingUpdate_AfterUpdate

End Sub

Private Sub ClassMeetingUpdate_AfterUpdate()

If DCount("[ClassMeetingID]", "tblClassMeeting", "[ClassProductID]=" & Me.ClassProductID & " and [ClassDate] = " & Me.ClassDate) > 0 Then

        MsgBox "Duplicate Entry"

Cancel = True

      DoCmd.RunCommand acCmdUndo

      DoCmd.GoToRecord , , acNewRec

   End If

End Sub

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Question by:RiCzN
  • 4
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  • +1
LVL 77

Accepted Solution

peter57r earned 250 total points
ID: 33533263
......and [ClassDate] =#" & format(Me.ClassDate, "yyyy-mm-dd") & "#")
LVL 42

Expert Comment

ID: 33533270
Probably need delimiters on the date:

DCount("[ClassMeetingID]", "tblClassMeeting", "[ClassProductID]=" & Me.ClassProductID & " and [ClassDate] = #" & Me.ClassDate)  & "#"

Expert Comment

ID: 33533331
You need #s around your date to indicate it is a date in the where condition, try it like this:

If DCount("[ClassMeetingID]", "tblClassMeeting", "[ClassProductID]=" & Me.ClassProductID & " and [ClassDate] = #" & Me.ClassDate & "#") > 0 Then

Author Comment

ID: 33533413
Still have problem with the following line:

DoCmd.RunCommand acCmdUndo

Author Comment

ID: 33533539
When i use Me.Undo, the last record would Undo but using the DoCmd doesn't. Would it be a problem if i used Me.Undo instead?
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LVL 42

Assisted Solution

dqmq earned 250 total points
ID: 33533549
There is nothing to UNDO.  You need to put the DCOUNT logic BEFORE you update the recordset.

Also, I recommend you reconsider the primary key for ClassMeeting table.  It should prevent the duplication you are concerned about.  Alternatively, you can add a no-duplicates index on ClassProductID + ClassDate.    

Expert Comment

ID: 33533582
I think you are too late to do an Undo at this point.  You should do the check for an existing item before you do the add.

Author Comment

ID: 33533619
How do i set up no-duplicates for ClassProductID + ClassDate?
Is it just a matter of selecting Index: Yes (No duplicates) for the two fields?

Author Closing Comment

ID: 33533842
LVL 42

Expert Comment

ID: 33534025
Creating an index like THAT only allows you to have one column in the index. In other words, you will end up with a separate unique index on each column. From table design, you need to open the Indexes menu.  There, you can create an index with multiple columns.  

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