hibernate, mapping using discriminator - need idea

[Krishnaa Kumar]

I Have a table(student) with columns stu_id, stu_name, favourite_subject, subject_id

favourite_subject will have predefined values like maths,english etc. if the value is maths, subject_id will have table: maths_subject's id.

meaning, based on favourite_subject value, subject_id will be pointing to the corresponding subject's id.

How can i implement in Hibernate ORM Framework.

<hibernate-mapping package="com.sample.project">
        <class name="StudentDTO" table="student">
            <meta attribute="class-description">class to hold student data</meta>
            <id name="id" type="long" column="stu_id">
                <generator class="increment"/>
            </id>
            <discriminator column="favourite_subject" type="string"/>
            <property name="studentName" column="stu_name" not-null="true"/>

            <!--??  here i don't know how to proceed. ??-->
            <subclass name="??????" discriminator-value="Maths">
                ????
            </subclass>
        </class>
    </hibernate-mapping>

all subjects will have their own tables & own corresponding entity classes.

[Vijitha Kumara]

Look at the example for discriminator strategy provided for Hibernate here.