Re: [Zope] Transactions

10 Aug 2000


      Hi Kapil Thangavelu!
I dont  know of if this is what your after, but here is one way do do
transacts with / without rollback


One simple way of having rollback is to do it with except raising a
flag, then 
if the flag gets turned on do whatever is needed to undo the current
action
this can be done recursivly, to rollback a whole sequence of actions

rollback=0
try:
  [do stuff foo]
  try:
    [do stuff bar]
  except:
    rollback=1
  if rollback:
    [rollback bar]
except:
  rollback=1
if rollback:
  [rollback foo]
...
hmmm... related question (i think) how does one make a method whose
effect can't be rolled back?
try:
  [do stuff foo]
   
  [do stuff bar]
except:
  pass


	/Jacob Lundqvist