[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-1534) Class hierarchy per table without discriminators / ignore subclass type and values

Class hierarchy per table without discriminators / ignore subclass type and values ---------------------------------------------------------------------------------- Key: HHH-1534 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1534 Project: Hibernate Core Issue Type: New Feature Affects Versions: 3.1 Reporter: Mattias Jiderhamn Priority: Minor I would like to see the ability of mapping a class hierarchy to a single table without any discriminators. That is, only the values of the mapped superclass are persisted and when the entity is loaded from database, it will have the type of the superclass. Example: class Foo { int a; int b; } class SubFoo extends Foo { int c; int d; } In this case, I want to be able to instantiate SubFoo, set the values of a, b, c and d, store the SubFoo and later retreive it as a Foo (not only refereced by a Foo pointer, but actually being a Foo instance). I do not wish to persist c and d, since they are only used for calculating a and b when the instance is first created. I can achieve this by having a separate, identical mapping for each class, but as there are lots of properties and collections it will be hard to maintain.