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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