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Tip of the Day
Language: Visual Basic
Expertise: Advanced
Jul 20, 2001



Application Security Testing: An Integral Part of DevOps

Rollback Transactions

One of the many functional methods of rolling back transaction(s) in a VB application is as follows:

1) In the procedure containing the Begintrans/CommitTrans methods, declare a Boolean Procedural variable (Flag) in the procedure containing the Begintrans/CommitTrans methods.

2) Declare the On Error statement at the beginning of the procedure

3) Create a generic On Error routine

4) Immediately after the BeginTrans call, set the Flag to true

5) Immediately after the CommitTrans call, set the flag to false

6) Check the status of the flag in the Error Routine and call RollbackTrans if it's set to true

Here's a code sample:
Private Sub RollbackTransTest(pCn as ADODB.Connection)
     Dim bIncompleteTrans As Boolean

     On Error GoTo Routine_Error

     bIncompleteTrans = False
     bIncompleteTrans = True
          '    Create/Update/Delete data
          '    Create/Update/Delete data
          '    etc.
     bIncompleteTrans = False
     Exit Sub

     If bIncompleteTrans = True Then pCn.RollbackTrans
     Err.Raise Err.Number, Err.Source, Err.Description
End Sub
Nazmul Siddiqui
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