JPA: is @PrimaryKeyJoinColumn(…) the same as @JoinColumn(…, insertable = ?, updatable = ?)?

Question

Can you derive from the JPA spec, if @PrimaryKeyJoinColumn(...), which doesn\'t have the insertable and updatable parameters, is the same as

@JoinC         


        

Answer 1

Yes, the two are equivalent.

Note in JPA 2.0 you can also add an @Id to a @OneToOne mapping and avoid having the duplicate basic id attribute altogether.

See

• Identity and Sequencing > Primary Keys through OneToOne and ManyToOne Relationships and
• OneToOne > Target Foreign Keys, Primary Key Join Columns, Cascade Primary Keys

from the WikiBooks Java Persistence pages