Is there a way? O/R mapping

javatwo · **Joined:** Tue Sep 13, 2005 2:01 am **Posts:** 137

Suppose I have a class hierarchy:

A
|--- B
|--- C
D
|--- E
|--- F
|--- G
|--- H

I like to use Table-per-class. But I like F and its subclasses(G,H,subtree) to be in one table so that I can avoid too many small tables.

Is there a way?

Thanks.
Dave

javatwo · **Joined:** Tue Sep 13, 2005 2:01 am **Posts:** 137

all spaces were ignored above.
G and H are subclasses of F.

A
|--- B
|--- C
D
|--- E
|--- F
-----|--- G
-----|--- H

christian · **Posted:** Mon Nov 28, 2005 4:43 pm

Go to the regular User forum.

javatwo · **Joined:** Tue Sep 13, 2005 2:01 am **Posts:** 137

I think this topic is EJB related. I am wondering if there is any annotation for this.

emmanuel · **Posted:** Tue Nov 29, 2005 5:38 am

this is not possible in Hibernate.
TablePerClass should not be considered as a mainstream strategy unless you're mapping legacy systems.

javatwo · **Joined:** Tue Sep 13, 2005 2:01 am **Posts:** 137

I have a class hierarchy that has 3 to 5 levels deep.
JOINED, or Table per class? which is better mapping strategy? which will perform better?

For JOINED, for every query, all related tables must be joined.

Thanks,
Dave