<<What I don't get is this: when would you NOT want to use inverse=true on a one-to-many relationship? >>
In monodirectional relationships. I would guess the reason this is not "happening by default" in bidirectional one-to-many refs is to have consistent behaviour with other mappings such as many-to-many refs where you need to choose one side. I'm not sure though... To answer your question - if you have have a bidirectional one-to-many rel, always use inverse=true. /Roger On Jun 30, 2:49 pm, James Allen <[email protected]> wrote: > I have been trying to get to grips with Hibernate's inverse attribute, > and it seems to be just one of those things that is conceptually > difficult. > > The gist that I get is that when you have a parent entity (e.g. > Parent) that has a collection of Child objects using a one-to-many > mapping, setting inverse=true on the mapping tells Hibernate that 'the > other side (the Child) has responsibility to update itself to maintain > the foreign key reference in its table'. > > Doing this appears to have 2 benefits when it comes to adding Children > to the collection in your code, and then saving the Parent: you save > an unneccessary hit on the database (because without inverse set, > Hibernate thinks it has two places to update the FK relationship) > (seehttp://nhprof.com/Learn/Alert?name=SuperfluousManyToOneUpdate), and > according to the official docs: > > "If the column of a association is declared NOT NULL, NHibernate may > cause constraint violations when it creates or updates the > association. To prevent this problem, you must use a bidirectional > association with the many valued end (the set or bag) marked as > inverse="true"." > > This all seems to make sense so far. What I don't get is this: when > would you NOT want to use inverse=true on a one-to-many relationship? --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
