CODEWITHSUNDEEP
javajpamappingprimary-keyjpa-2.0
Kawu
Kawu

Reputation: 14003

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

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

@JoinColumn(..., insertable = false, updatable = false)

or

@JoinColumn(..., insertable = true, updatable = true)

when used on regular (non-inheritance) associations? Should they be interchangable? What are the insertable and updatable properties set to? Are they set to anything at all? Note, I'm only targeting the read-only attribute that both (seem to) implement...

I'm getting rather inconsistent mapping exception with EclipseLink and Hibernate...

Here's the @PrimaryKeyJoinColumn JavaEE 5 + 6 Javadoc:

PrimaryKeyJoinColumn (JavaEE 5)
PrimaryKeyJoinColumn (JavaEE 6)

Quote:

... and it may be used in a OneToOne mapping in which the primary key of the referencing entity is used as a foreign key to the referenced entity.

Upvotes: 11

Views: 22060

Answers (1)

James
James

Reputation: 18379

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

from the WikiBooks Java Persistence pages

Upvotes: 15

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