can relationship include the subclasses?

isabella Feb 7, 2003 2:11 AM

hello,

thx alot for the quick reply to my previous questions, they really helped solving part of the JBOSS mystery in my mind ^_^"

now i have another problem:

say i have an entity bean called BEAN, and another entity bean BEAN_PARTNER, they have a 1:1 relationship, ie, each BEAN has got a BEAN_PARTNER.

now i have another bean BEAN_SON which extends BEAN, i found from trial (i did include the get/set methods in the local interface....) that i cannot set a BEAN_PARTNER for BEAN_SON, as has been possible for BEAN, its superclass....

i would like to know, can such relationship include the sublcasses by any means?

thx in advance,
isabella~

1. Re: can relationship include the subclasses?

adrian.brock Feb 7, 2003 3:01 PM (in response to isabella)

CMP/CMR caters for what would be possible
in the underlying persistent store.

For a DB, you cannot define a constraint on a table
BEAN_PARTNER that relates to two other tables
BEAN/BEAN_SON using one column.
Relational constraints are not polymorphic.

You can include a relation between BEAN and BEAN_SON
where BEAN_SON holds a link to a BEAN and then defines
extra columns. The relation to BEAN_PARTNER is then
stored only in the BEAN table.

Regards,
Adrian
Actions