Hi,
I'm trying to mimic a 3-level deep inheritance structure using a mix of table-per-class hierarchy and table-per-subclass (Hibernate 3). For some reason, I can't seem to define the appropriate mapping such that I can nest subclasses accordingly.
For example, say I have 3 abstract classes: AbstractZ extends AbstractY, and AbstractY extends AbstractX. I have a concrete implementation for each abstract class--call it ConcreteX, ConcreteY and ConcreteZ. Based on this inheritance structure, I would assume I can map this 3 levels deep using a mix of table-per-class hierarchy and table-per-subclass. This is my mapping:
Code:
<hibernate-mapping auto-import="false">
<class
name="com.test.AbstractX"
table="X">
<id name="xId" type="long">
<column name="X_ID" not-null="true"/>
<generator class="native"/>
</id>
<discriminator column="X_TYPE" type="string"/>
<subclass
name="com.test.ConcreteX"
discriminator-value="ConcreteX"/>
<subclass
name="com.test.AbstractY">
<join table="Y">
<key column="Y_ID"/>
<property name="value" column="VALUE" type="string"/>
</join>
<subclass
name="com.test.ConcreteY"
discriminator-value="ConcreteY"/>
<subclass name="com.text.AbstractZ">
<join table="Z">
<key column="Z_ID"/>
<property name="desc" column="DESC" type="string"/>
</join>
<subclass
name="com.test.ConcreteZ"
discriminator-value="ConcreteZ"/>
</subclass>
</subclass>
</class>
</hibernate-mapping>
For some reason, the above mapping has hibernate create the three tables but Y and Z's primary/foreign keys are constrained with X's. This is more like a 2-level hierarchy. I was hoping that Z's key would be dependent on Y's, and Y's key would be dependent on X's (to mimic 3 levels).
I would appreciate any help on figuring this inheritance hierarchy out. Thanks in advance!
-los
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