Hibernate Table per subclass: using a discriminator
Reehan Lalkhanwar
Ranch Hand
Posts: 106
posted 7 years ago
The argument here is:
"Hibernate's implementation of table per subclass does not require a discriminator column. Other object/relational mappers use a different implementation of table per subclass that requires a type discriminator column in the superclass table. The approach taken by Hibernate is much more difficult to implement, but arguably more correct from a relational point of view."
One of the things that hibernate would NOT be able to do, I suspect, is to intelligently create an instance of the appropriate subclass when the program only asks for an instance of the base class. This might be useful for some kind of look-ahead caching.
So how does hibernate handle this issue?
"Hibernate's implementation of table per subclass does not require a discriminator column. Other object/relational mappers use a different implementation of table per subclass that requires a type discriminator column in the superclass table. The approach taken by Hibernate is much more difficult to implement, but arguably more correct from a relational point of view."
One of the things that hibernate would NOT be able to do, I suspect, is to intelligently create an instance of the appropriate subclass when the program only asks for an instance of the base class. This might be useful for some kind of look-ahead caching.
So how does hibernate handle this issue?
Thank you,
Reehan
