Hibernate version:
Hibernate Annotations 3.3.0.GA
Hibernate 3.2.5

Mapping documents:
Annotations:



Name and version of the database you are using:
Oracle 10g


We have an extension type table, where there is at most one entry in the extension table per row in the original. There might be none.

The Id of the original table is thus the Id of the extension table. I also want to access the original table from the extension.

The above code is what I currently have. I tried putting the @Id on the getOriginal method, but that complains about the type of the original.



With the above code, it forces me to create a setter for the Id on the extension table, but that does not make sense as its set by setting the original object onto the extension object.

I am probably doing this the wrong way - any tips/pointers?

Thanks in advance,
Chris[/quote]

bump... Am I just trying to use hibernate incorrectly or is there a trick to what I am doing?

Thanks in advance,
Chris

As far as I know you can't just annotate @Id on a getter method without getter having a field declared in the same class. The other mistake I see is getOriginal() method and field orig - they should be named the same. If the field is orig, the getter should be named getOrig() otherwise hibernate cannot associate the getter with the field.

Also I don't agree that both entities share the same primary key but each entity should have its own PK with Extension a foreign key to Original. Alternative to this is only composite.

I don't know if I was any help but I tried my best. ;)

Hi,

Thanks for the reply - I was keen to get a separate key on the entity, but my colleague seems to think its a better reflection of the underlying data...

My other solution was to have both the original object and its key on the extension class - with a hack that when you set the original object, it also set the key - but it really is a hack :(.

Thanks,
Chris