From Xojo Documentation
Cancels an open transaction restoring the database to the state it was in before the transaction began.
You will generally want to rollback database changes if a DatabaseException occurs within the transaction.
You have to have an open transaction to be able to use Rollback. Call BeginTransaction to begin a transaction:
== Sample Code ==
This code uses rollback to revert database changes in a transaction when an error occurs:
// Prior DB code has run
Catch error As DatabaseException
MessageBox("Error: " + error.Message)