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Transaction Processing

Posted on 1998-12-15
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Last Modified: 2010-05-03
Can I have a trasaction that spans multiple forms?  To do this, do I have to define Workspace and define and open the DB in a global module shared by all forms in my application?
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Question by:baileys
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vbWhiz earned 200 total points
ID: 1450368
In a word, Yes Yes.

Unless you are using bound forms. I havn't ever used bound forms in VB so if you are that may make things a little more difficult.

If, however, you save information to the database using code then it is really quite simple to wrap data alterations in a transaction. The more difficult part is structuring your application in a way that makes it easy to understand what is going on or that seamlessly uses transactions behind the scenes to insure the data is being modified all at once.


This is some psuedo code (you probably don't want buttons to begin, commit, and cancel the transaction. This is just to illustrate how to use transactions in a form-based application using a public workspace variable.)


'[Code in the declarations section of a module]

Public WS as workspace
Public DB as database
Public TransactionInProcess AS Boolean

Public Sub Connect()

Set WS = DBEngine.CreateWorkspace("","Admin","")
Set DB= WS.OpenDatabase("C:\MyDB.mdb")

End Sub




'[Code in the header form]

Private Sub cmdBeginTrans_Click()

  IF TransactionInProcess Then Exit Sub

  WS.BeginTrans

End Sub

Private Sub CmdSave_Click()

'Save the info here using a recordset created from the public DB

End Sub


Private Sub cmdCommitTrans_Click()

  IF Not TransactionInProcess Then Exit Sub

  WS.CommitTrans

End Sub

Private Sub cmdCancelTrans_Click()

  IF Not TransactionInProcess Then Exit Sub

  WS.Rollback

End Sub



'[Code on a detail form]

Private Sub CmdSave_Click()

'Save the info using another recordset based on the public DB

End Sub


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