Re: Problem mapping inheritance hierarchy using joined tables for subclasses

[Jakob Braeuchi]

hi peter,

you could try to define an extent in classdescriptor of Address pointing 
to PersonAddress. BUT the problem is that extents and super-references 
do not go together well. you may end up with instances of the wrong 
class. the support for mapping one class to multiple tables needs 
improvement ;)

jakob

Peter Wieland wrote:

Hi,

I try to map two classes Address and PersonAddress (a subclass of Address)
using the joined table per sublcass strategy. This is my mapping:
  <class-descriptor class="de.armax.sandbox.entity.Address"
    table="Address">
    <field-descriptor autoincrement="true" primarykey="true"
      column="adrOID" jdbc-type="VARCHAR" name="oID"/>
    <field-descriptor column="adrAttribute" jdbc-type="VARCHAR"
name="attribute"/>
    ...
  </class-descriptor>
  <class-descriptor class="de.armax.sandbox.entity.PersonAddress"
    table="PersonAddress">
    <field-descriptor autoincrement="true" primarykey="true"
      column="padOID" jdbc-type="VARCHAR" name="oID"/>
    <field-descriptor column="padAdditionalAttribute" jdbc-type="VARCHAR"
      name="additionalAttribute"/>
    ...
    <reference-descriptor
      auto-delete="true"
      auto-update="true"
      name="super"
      class-ref="de.armax.sandbox.entity.Address">
      <foreignkey field-ref="oID"/>
    </reference-descriptor>
  </class-descriptor>
Storing new Addresses or Personaddresses works fine. But when I reload
Adresses using
  broker.getIteratorByQuery(QueryFactory.newQuery(Address.class, new
Criteria()));
OJB seems not to care about what type these addresses have. All returned
entities will be of type Address, even if they were stored as PersonAddress.
Is this a bug or am I missing something here?
Thanks for any help,

Peter

P.S.: I'm very sorry if this mail appears two times on the list. I send it
from a bad account before and I'm not sure weather the ojb user list accepts
this.
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