Hibernate version:2.1.8

Hello
I want to save class B with class A like parent, object A was created before.
I have tried to save class B but, when you try this, is created A with B.

do you have how to do this?

Thank you

Andreikov

If you're using subclasses, an instance of a subclass (class B) is an instance of the superclass too (class A). If you're expecting your object to have two separate classes, A and B, where B is subclassed from A, then you aren't fully understanding object orientation or polymorphism. It is possible that you shouldn't be subclassing, you should have distinct classes with a relational association (a many-to-one or whatever).

We take the following case:
I have the class User with a lot of users registered, after (1 year after) I want to classify the users (the next and old users) like admin and common, then I need to create two subclasses from class User called AdminUser and CommonUser adding another attributes.
Then, I would like to create AdminUser for an old User, that is the questions, and I have problem to this operation

Best regards

Andreikov

Create an (in-memory) AdminUser with the same fields as the existing User (including the PK field), then save the AdminUser. Make sure you Session.evict() the User before saving the AdminUser, so that you don't have two cached objects referring to the same DB row.

From then on, retrieving that User will return an AdminUser.