What is <discriminator > in Hibernate? How exactly inheritance of Object

What is <discriminator > in Hibernate? How exactly
inheritance of Object to Tables can be done? What is the
benefits of discriminator?

Question Posted / venu

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What is <discriminator > in Hibernate? How exactly inheritance of Object to Tables can be do..

Answer / haneef

Hi,
<discriminator> is useful, when you want to write a single
mapping file for the multiple pojo s which are under
inheritance.

Ex : Person<---Employee<----PermanentEmployee

<hibernate-mapping>
<class name="app.Person" table="ONE_PERSONS"
discriminator-value="p">
<id name="perId" column="PID">
<generator class="increment" />
</id>
<discriminator column="P_TYPE" />
<property name="perName" column="PNAME" />
<subclass name="app.Employee" discriminator-value="e">
<property name="empId" column="ENO" />
</subclass>
<subclass name="app.PermanentEmployee"
discriminator-value="pe">
<property name="allow" column="ALLOW" />
</subclass>
</class>
</hibernate-mapping>

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