How do I stop spring data JPA from doing a SELECT before a save()?

Question

Here is the code of Spring SimpleJpaRepository you are using by using Spring Data repository:

@Transactional
public <S extends T> S save(S entity) {

    if (entityInformation.isNew(entity)) {
        em.persist(entity);
        return entity;
    } else {
        return em.merge(entity);
    }
}

It does the following:

By default Spring Data JPA inspects the identifier property of the given entity. If the identifier property is null, then the entity will be assumed as new, otherwise as not new.

Link to Spring Data documentation

And so if one of your entity has an ID field not null, Spring will make Hibernate do an update (and so a SELECT before).

You can override this behavior by the 2 ways listed in the same documentation. An easy way is to make your Entity implements Persistable (instead of Serializable), which will make you implement the method “isNew”.

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