[Zope-dev] Re: New ways of getting transactions?

[Tres Seaver]

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Andreas Jung wrote:
> 
> 
> --On 11. Dezember 2005 17:01:56 +0100 "Morten W. Petersen"
> <morten at nidelven-it.no> wrote:
> 
>> Hi,
>>
>> I'm having some code that bombs out trying to commit a transaction;  I
>> believe it's because of new ways of doing things in Zope 2.9..  how do
>> you call the equivalents of get_transaction().commit() and abort() in
>> Zope 2.9?  Will those new ways work with Zope 2.7/2.8?
>>
>>
> 
> See doc/ZODB.txt. Of course the new API will not work in Zope 2.7/2.8.

The 'transaction' module is present in Zope 2.8.x / ZODB 3.4.x.  Forward
compatibility for third-party produccts which need to work on both 2.7.x
and 2.8.x+ usually looks like this:


try:
    import transaction
except ImportError:
   class transaction:
       """ Forward-compatibility for Zope 2.7.x
       """
       def begin(self):
           get_transaction().begin()

       def commit(self, sub=False):
           get_transaction().commit(sub)

       def abort(self, sub=False):
           get_transaction().abort(sub)

       def savepoint(self, optimistic=None):
           get_transaction().commit(optimistic and 1 or 0)

       def get(self):
           return get_transaction()

    transaction = transaction()

I'll agree with Jim and Morten that the deprecated 'get_transaction()'
pattern should *not* have been ripped out in Zope 2.9b1 (2.10 is the
earliest feasible point, I think).


Tres.
- --
===================================================================
Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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