Hi,

I'm trying to implement an inheritance with a discriminator. And I want to have a set of the classes in such an inheritance tree.

Class Parent {}
Class Child1 extends Parent {}
Class Child2 extends Parent {}

Class Scheme {
Set<Child1> data;
}

I would like to have in a Scheme class a set of Child1.

And when I'd like to save the Scheme object with a link to a Child1 I have the following SQL log:
Hibernate: select gen_id( GEN_SCHEME_ID, 1 ) from RDB$DATABASE
Hibernate: select gen_id( GEN_PARENT_ID, 1 ) from RDB$DATABASE
Hibernate: insert into T_SCHEME (title, description, id) values (?, ?, ?, ?)
Hibernate: insert into T_PARENT (title, description, SCHEME_ID, discriminator, id) values (?, ?, ?, 'child1', ?)
Hibernate: insert into T_CHILD1 (..........) values (?, ?, ?, ?, ?, ?, ?)
Hibernate: update T_PARENT set SCHEME_ID=? where id=?

I'm confused why SCHEME_ID is inserting in T_PARENT table?! I want it to be in CHILD1 table!
Is it possible or not?

Thank you in advance.


The sample XML-mapping is below:

<hibernate-mapping>
<class name="Scheme" table="T_SCHEME">
<id name="id">
<generator class="native">
<param name="sequence">GEN_SCHEME_ID</param>
</generator>
</id>

.......

<set name="child" cascade="all" lazy="false">
<key column="SCHEME_ID" not-null="true"/>
<one-to-many class="Child1"/>
</set>

</class>
</hibernate-mapping>

<hibernate-mapping>
<class name="Parent" table="T_DATA">
<id name="id">
<generator class="native">
<param name="sequence">GEN_USER_ID</param>
</generator>
</id>

<discriminator column="discriminator" type="string"/>

.........

<subclass name="Child1" discriminator-value="child1">
<join table="T_CHILD1">
<key column="ID"/>
....
</join>
</subclass>

<subclass name="Child2" discriminator-value="child2">
<join table="T_CHILD2">
<key column="ID"/>
....
</join>
</subclass>
</class>
</hibernate-mapping>