in short - NH is not doing any magic here - but using ADO.NET transactions (which in turn use the underlying RDBMS's transactions)
On Wed, Sep 24, 2008 at 3:50 PM, Ayende Rahien <[EMAIL PROTECTED]> wrote: > Depending on too many factors. > What is the isolation level? What is the concurrency behavior you > specified? > > > On Wed, Sep 24, 2008 at 3:44 PM, N. D. <[EMAIL PROTECTED]> wrote: > >> Sorry i will try to reformulate >> say you've started a transaction and someone modifies the DB, will it >> overwrite or exception? >> >> >> >> On Wed, Sep 24, 2008 at 3:41 PM, Ayende Rahien <[EMAIL PROTECTED]> wrote: >> >>> Not following. What do you mean doesn't matter? The transaction setting? >>> Because NHibernate doesn't have different behavior based on that. >>> >>> >>> On Wed, Sep 24, 2008 at 3:36 PM, ndotan <[EMAIL PROTECTED]> wrote: >>> >>>> >>>> thanks for the very quick answer ayende >>>> can you elaborate why the model doesnt matter? >>>> >>>> >>>> On Sep 24, 3:33 pm, "Ayende Rahien" <[EMAIL PROTECTED]> wrote: >>>> > On Wed, Sep 24, 2008 at 3:27 PM, ndotan <[EMAIL PROTECTED]> wrote: >>>> > >>>> > > hey guys i was presenting NH, and got some questions.. >>>> > >>>> > > 1. what happens if DB not support transactions and im trying a >>>> > > transaction >>>> > >>>> > An exception is thrown. NHibernate mandates the use of transactions. >>>> > >>>> > > 2. is the transaction model pesimistic? >>>> > >>>> > Doesn't matter. >>>> > >>>> > >>>> > >>>> > > 3. when i use session.Get twice in a row, NH doesnt query the DB >>>> again >>>> > > and gives me the same instance, >>>> > > when does NH know to go to the DB and update that entity? how does >>>> > > it know that the database row was changed in order to go to the DB? >>>> > >>>> > It get it from the session first level cache. It doesn't go to the DB >>>> and >>>> > you'll get stale object exception if you setup concurrency right and >>>> someone >>>> > changed the row underneath you >>>> > >>>> > > sidenote(slightly offtopic, but it came up in the presentation): >>>> > > is MS entityframework with oracle a fiction? >>>> > >>>> > I haven't seen or heard anything about it. It may exists, though. >>>> >>>> >>> >>> >>> >> >> >> > > > > -- Ken Egozi. http://www.kenegozi.com/blog http://www.musicglue.com http://www.castleproject.org http://www.gotfriends.co.il --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/nhusers?hl=en -~----------~----~----~----~------~----~------~--~---
