Pessimistic Locking

Posted on 1998-06-16
Last Modified: 2010-05-03
I have a database named School and a table named module.  When I enter the edit mode I am able to change information.  If I am in edit mode and someone else tries to manipulate the record I am working on, I want an error to occur when the second user hits the Save button.  I am using SQL for all my searches, adds, updates, and deletes.  Can you give me the code that will accomplish this procedure?
Question by:paulca
  • 3

Accepted Solution

clifABB earned 10 total points
ID: 1463417
The following will open the database for exclusive use:
Set dbData = OpenDatabase("School.mdb", True)

The following will open the table with pessimistic locking:
Set rsTable = dbData.OpenRecordset("module", dbOpenDynaset,,dbPessimistic)

Author Comment

ID: 1463418
I was also looking for the errot trapping code.  I'll add another 5 points since I was not specific with that point.

Expert Comment

ID: 1463419
Your error handler might look like this:

On Error Goto HandleError
'Process code here
Exit Sub

If Err.Number = 3186 Then
  'The user attempted to update a page that contains a read lock placed by another user.
  nRes = MsgBox("Another user has this record locked.  Try again?", vbYesNo + vbQuestion, "Write Error")
  If nRes = vbYes Then
    Exit Sub
  End If
  'Handle other errors
End If

Expert Comment

ID: 1463420
Modify the line to read:
If Err.Number = 3186 Or Err.Number = 3260 Then

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

I’ve seen a number of people looking for examples of how to access web services from VB6.  I’ve been using a test harness I built in VB6 (using many resources I found online) that I use for small projects to work out how to communicate with web serv…
I was working on a PowerPoint add-in the other day and a client asked me "can you implement a feature which processes a chart when it's pasted into a slide from another deck?". It got me wondering how to hook into built-in ribbon events in Office.
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…

867 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

18 Experts available now in Live!

Get 1:1 Help Now