On Saturday 07 June 2008 21:35:35 Tomer wrote: > If I am just issuing a read-only query, and I want to make sure > that nothing will change in the middle, do I need a transaction? If > so, what do I do with it when I'm done - commit or rollback? > > For example, I want to do this: > > for user in Session.query(User): > print user.name > > Should I use a transaction like this: > > Session.begin() > for user in Session.query(User): > print user.name > Session.commit() > If not, how would I deal with this if my session (created with > scoped_session) is transactional? if the __str__ happens to self-change (well, shit happens), then u should not do commit nrt flush. the safest is to rollback - regardless what u do. or maybe close() or clear()? i think there was some way to make the session readonly alltogether -- but i'm not sure.
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