[ http://jira.nhibernate.org/browse/NH-662?page=comments#action_14944 ] john book commented on NH-662: ------------------------------ http://www.bittyurl.com/?b04fd3 http://www.bittyurl.com/?408357 http://www.bittyurl.com/?8b2d82 http://www.bittyurl.com/?0357ad http://www.bittyurl.com/?42b9f6 http://www.bittyurl.com/?e461fa http://www.bittyurl.com/?c34669 http://www.bittyurl.com/?7f1f64 http://www.bittyurl.com/?47877e http://www.bittyurl.com/?560be6 http://www.bittyurl.com/?ceed2c http://www.bittyurl.com/?c02605 http://www.bittyurl.com/?7a433f http://www.bittyurl.com/?3157f7 http://www.bittyurl.com/?df83d4 http://www.bittyurl.com/?3229c6 http://www.bittyurl.com/?358ac2 http://www.bittyurl.com/?275533 http://www.bittyurl.com/?37af1b http://www.bittyurl.com/?38159c http://www.bittyurl.com/?519f83 http://www.bittyurl.com/?6b9e49 http://www.bittyurl.com/?bf3609 http://www.bittyurl.com/?7b37af http://www.bittyurl.com/?4f5113 http://www.bittyurl.com/?db6542 http://www.bittyurl.com/?fc8ac6 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Hierarchies > ----------------- > > Key: NH-662 > URL: http://jira.nhibernate.org/browse/NH-662 > Project: NHibernate > Type: New Feature > Components: Core > Versions: 1.2.0.Beta2 > Reporter: Anton Gogolev > Priority: Minor > Fix For: LATER > > NH can only persist/load classes explicitly mapped to database tables in HBM files. On the one hand, this is quite logical. But on the other it limits further use of mapped classes. For instance, it is impossible to inherit from them and save the ancestor since its type is not mentioned anywhere in the mapping files. Here's an example: > // Base is mapped to, say, Base table in Base.hbm.xml > class Base > { > public int A > { get ...; set ... } > protected virtual Foo() > { > // Some logic. > } > } > // Derived has no mapping file > class Derived : Base > { > protected override Foo() > { > // Some other logic > } > } > static void Main() > { > ISession session = sessionFactory.OpenSession(); > Base base = new Base(); > base.A = 12; > session.Save(base); // This succeeds > base = session.Load(typeof(Base), 2) as Base; // This succeeds as well > base = new Derived(); // Note "Derived" here > base.A = 13; > session.Save(base); // And this fails > // We won't even get here, but if we did, > // this would have failed too > base = session.Load(typeof(Derived), 3) as Derived; > } > As you can see, the logic behind this is quite OOP-ish :) You inherit from some class to extend its functionality and state (in other words, functions and member variables). However, this is not possible with NHibernate, since it requires every derived class to be mapped somehow. > How I see it done (conceptually) is as follows. > Upon persisting an entity NH should traverse a list of base classes of the entity being persisted, until it finds a type which is mapped to a database table. This type is used to persist an entity. > When loading an entity from the database, NH can freely create an instance of derived class, since it is given its type (typeof(Derived) in the example above). Then again it traveses a list of base classes, and loads derived object as an object of base class. Of course some properties remain uninitialized, but that's not a problem, I think. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.nhibernate.org/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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