Hello Michael,
Thanks for your enlightening comments, pls see my comments below.
On 12/29/07, Michael Bayer <[EMAIL PROTECTED]> wrote:
>
>
> the transaction "commit" inside the create_draft method is a little
> strange. usually, if you have a long running transaction, there would
> be a begin()/commit() pair framing a series of operations. issuing
> commits inside of method sets seems to imply you dont really want a
> "transactional" session....but the session begins the next transaction
> lazily so theres probably nothing terrible about doing it that way.
Got it, I think. I get rid of all .commit() calls and wrap all methods with
explicit transactions:
@transactional_method()
def create_draft(self):
# ...
def transactional_method():
def wrapper(func, self, *args, **kwargs):
session = self.session # shortcut
session.begin()
try:
rv = func(self, *args, **kwargs)
session.commit()
return rv
except:
session.rollback()
raise
return decorator(wrapper)
I also turn off automatic transactions:
Session = scoped_session(sessionmaker(autoflush=True, transactional=False))
Does it looks correct? It works, as far as my tests tell me.
I've tried transactional=True but it broke the app in a lot of places where
there were no explicit commits. May be I update the code eventually to
always be explicit but for now I'm more concerned to get the code working
again, after 0.4 update.
> Btw, is it possible to retrieve metadata if you have an engine or
> > configured session object? I haven't found a way so ended up storing
> > it in a module global when session is configured.
>
> MetaData is usually a module global, its attached to tables also....so
> for example class_mapper(AnyMappedClass).mapped_table.metadata
This method works for me, thanks.
Max.
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