This mixed strategy can be very usefull. But obviously there is
uncompatibility with standards. I think that additional annotation can
be used to change standard behaviour. So, at this example strict
TABLE_PER_CLASS strategy should work without any additional annotations.
And to get the mixed strategy we shoud add @Inheritance annotation to
some class in hierarchy (e.g. AbsractFoo).
Pinaki Poddar:
You are right. OpenJPA should use the inheritance strategy used at the root
of the hierarchy throughout the derived tree. The extra strategy
specification perhaps is resulting from the facility to support mixed
strategy. Needs further investigation...
hallmit wrote:
Thanks guys, I put @Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
to AbstractFoo and now it works fine...I have also put
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS) to the first
concrete class of my class hierarchy otherwise the SINGLE_TABLE strategy
is used for the branch.
I thought it was sufficient to annotate the root class with
TABLE_PER_CLASS and so all classes in the hierarchy would have the same
strategy...apparently not for OpenJPA...
JSR 220 (JPA-1.0) spec talk :
"The Inheritance annotation defines the inheritance strategy to be used
for an entity class hierarchy.
It is specified on the entity class that is the root of the entity class
hierarchy."
...
In any case thank you very much for your help!
-----
Pinaki Poddar http://ppoddar.blogspot.com/
http://www.linkedin.com/in/pinakipoddar
OpenJPA PMC Member/Committer
JPA Expert Group Member
