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Pessimistic Locking

Posted on 1998-06-16
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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?
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Question by:paulca
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4 Comments
 
LVL 6

Accepted Solution

by:
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)
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Author Comment

by:paulca
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.
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LVL 6

Expert Comment

by:clifABB
ID: 1463419
Your error handler might look like this:

On Error Goto HandleError
'
'Process code here
'
Exit Sub

HandleError:
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
    Resume
  Else
    Exit Sub
  End If
Else
  'Handle other errors
End If
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LVL 6

Expert Comment

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