Solved

DCount Not Working

Posted on 2010-08-26
10
313 Views
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.

Thanks
Ric

Private Sub Command9_Click()

Dim rs As dao.Recordset

Set rs = CurrentDb.OpenRecordset("tblClassMeeting")

    With rs

         .AddNew

         !ClassProductID = Me.ClassProductID

         !ClassDate = Me.ClassDate

         .Update

    End With

rs.Close

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

Open in new window

ClassMeetingForm.jpg
ClassMeetingSampleData.jpg
0
Comment
Question by:RiCzN
  • 4
  • 3
  • 2
  • +1
10 Comments
 
LVL 77

Accepted Solution

by:
peter57r earned 250 total points
ID: 33533263
......and [ClassDate] =#" & format(Me.ClassDate, "yyyy-mm-dd") & "#")
0
 
LVL 42

Expert Comment

by:dqmq
ID: 33533270
Probably need delimiters on the date:

DCount("[ClassMeetingID]", "tblClassMeeting", "[ClassProductID]=" & Me.ClassProductID & " and [ClassDate] = #" & Me.ClassDate)  & "#"
0
 
LVL 2

Expert Comment

by:bgrandjean
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
0
 

Author Comment

by:RiCzN
ID: 33533413
Still have problem with the following line:

DoCmd.RunCommand acCmdUndo
0
 

Author Comment

by:RiCzN
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?
0
Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

 
LVL 42

Assisted Solution

by:dqmq
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.    
0
 
LVL 2

Expert Comment

by:bgrandjean
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.
0
 

Author Comment

by:RiCzN
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?
IndexNoDuplicates.jpg
0
 

Author Closing Comment

by:RiCzN
ID: 33533842
Thanks
0
 
LVL 42

Expert Comment

by:dqmq
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.  
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Link Excel Spreadsheet to Access, not using Transferspreadsheet 5 31
sort Time by AM and PM in query 2 21
Syntax Error in Query 7 31
Search Form with Run Time Error 3075 1 23
Introduction When developing Access applications, often we need to know whether an object exists.  This article presents a quick and reliable routine to determine if an object exists without that object being opened. If you wanted to inspect/ite…
In a multiple monitor setup, if you don't want to use AutoCenter to position your popup forms, you have a problem: where will they appear?  Sometimes you may have an additional problem: where the devil did they go?  If you last had a popup form open…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now