On Wed, Dec 28, 2011 at 2:10 PM, Michael Merickel <mmeri...@gmail.com> wrote: >> > Question: if multiple scoped sessions are created, each using >> > ZopeTransactionExtension, would they all automatically fit into the >> > global commit/rollback? >> > >> > Can we use the same ZopeTransactionExtension *instance* for all the >> > scoped sessions, or would they each need a separate instance? >> >> yeah I'd like to get guidance from Chris McD or Lawrence Rowe on what a >> multiple-session integration path might be (or if all apps should really use >> one Session with zope.sqlalchemy). also my apologies for screwing up it's >> name. > > > Sorry, I'm not Chris or Lawrence, but I can tell you that the "transaction" > package, which the ZTE and many other transaction-aware packages support, > utilizes a threadlocal manager to which each ZopeTransactionExtension (ZTE) > instance joins. The short answer is that if you have multiple ScopedSession > objects that are using the ZTE, they will all be controlled by the same > global transaction, and when pyramid_tm does transaction.commit() all of the > sessions that are marked dirty will be committed. The ZTE supports two-phase > transactions, but only if the ScopedSession is initialized with > "twophase=True", thus ideally all sessions are done this way: > > DBSession > = scoped_session(sessionmaker(extension=ZopeTransactionExtension(), > twophase=True))
Is there any downside to setting twophase=True by default? Would it make life more complex for simple applications? Also, again, I need to know whether it's safe to share a _zte instance between two sessionmakers. Because if it's not, the docs will have to warn people to use it only with the default session. -- Mike Orr <sluggos...@gmail.com> -- You received this message because you are subscribed to the Google Groups "pylons-discuss" group. To post to this group, send email to pylons-discuss@googlegroups.com. To unsubscribe from this group, send email to pylons-discuss+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/pylons-discuss?hl=en.
