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I shall try to explain by a small example. I have aclass called “person” which has say an attribute “name” and “Birthday”. I have a subclass of class “Person” called “Employee” and “Employee” has an attribute “ssn” which I want to treat as a natural-id. But Hibernate doesnot allow this. It doesnt allows natural-id tags for any subclass tag.
I would really appreciate some help on this. I have tried to serach for some example mapping similar to my example but havent had any luck. If teher is some alternate way for me map this do let me know.I am new to Hibernate. After readinga lot of forums on the net and going through the Hibernate DTD I came across the “key” element that can be used with the subclasses but it seems to be refering to the PK column of the parent class.
This issue is blocking me from moving ahead. I would really appreciate any help on this.see chapter 4.2 in hibernate documentation
this is important
‘A subclass must also observe the first and second rules. It inherits its identifier property from the superclass, Cat.’you can change ID in subclas, but if you have to use SSN (for example) try with unique-key – unique key have features similar PK – it garanty uniqueness and you can make foreign key with him
regards
