Let's say I have two classes, Resource and User and every resource has an owner (which is an instance of User). This can be easily done with a many-to-one association from Resource to User like this:


Now when it comes to deleting a user all resources that refer to that user have to be deleted manually. Otherwise the 'not-null' constraint gets violated and the database is broken.

So, can Hibernate somehow remove the resources automatically? That would require a 'cascade' that work the other way around and propagates the operation from User to Resource.

Any help would be appreciated.

Markus

define one-to-many from User to resources with cascade all|delete|all-delete-orphan|delete-orphan

Lukasz

Thanks for the answer. But I think one-to-many is used for Collection Mapping and cannot be used for this purpose. Am I wrong?

User can have many Resources - isn't it a Collection (Set)?



Lukasz

yes, but the use case here was that a resource has 1 owner. it's obviously the use case for this particular system.

take a look at 6.8. Bidirectional Associations