Dear All,

In one to one relationship, you can use @JoinColumn or @PrimaryKeyJoinColumn to represent the relationship. Can anyone tell me that which situation should be used in this 2 ways? Thanks

Best Rdgs
Ellis

Hi Ellis,

the difference is on how the relationship between the two entities is persisted. Using @JoinColumn a foreign key column will be used within the entity defining the annotation. Using @PrimaryKeyJoinColumn no additional column is needed since both entities share the same primary key. There is also a third option using @JoinTable.

The question regarding which option to choose is a matter of taste. If you have the freedom to start from scratch I would go with the default (JoinColumn). The other options allow you to integrate for example with existing databases where the schema cannot be modified.

Have a look at the online documentation: http://www.hibernate.org/hib_docs/annotations/reference/en/html_single/#entity-mapping-association

--Hardy