Hibernate

Same Primary Key Mapping
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In this approach owner and owned shared same primary key value.

Advantages:

  • It eliminate the need of foreign key.

Disadvantages:

  • A special id is generator is required to used id of one object as id of another.
  • If it converted into one-to-many then this approach will not be used.

SamePk.hbm.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-mapping>
<class name="r4r.Address">
<id name="id" type="int">
<generator class="increment"></generator>
</id>
<property name="city"></property>
<property name="street"></property>
</class>
<class name="r4r.Person">
<id name="id" type="int">
<generator class="foreign">
<param name="property">address</param>
</generator>
</id>
<property name="name"></property>
<one-to-one name="address" class="r4r.Address" cascade="all">
</one-to-one>
</class>
</hibernate-mapping>
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