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javahibernatejpahibernate-mapping

How to assign value of PrimaryKey(generated using sequence) to another variable while persisting with JPA?

I have implemented a customised sequence based generator which generates primary key of an entity. I want to assign same value to another member variable while persisting the entity. Is there anyway this can be done?

Solution

  • You can use a @PostPersist annotated method. To keep things simple, let me just use an auto generated id.

    @Entity
@Table(name = "PERSON")
class Person {

    @Id
    @GeneratedValue
    private Long id;

    private Long idDup;

    // Getters and setters removed for brevity

    @PostPersist
    public void perPersist() {
        this.idDup = id;
    }
}

    From the documentation:

    @PostPersist is executed after the entity manager persist operation is actually executed or cascaded. This call is invoked after the database INSERT is executed.

    Note that @PostPersist is a JPA annotation hence would work on all providers.