CODEWITHSUNDEEP
javahibernatejpaorm
user2740224
user2740224

Reputation:

When hibernate sets primary key(id)?

I have this code:

Candidate candidate = new Candidate();
candidate.setName("testUser");
candidate.setPhone("88888");
candidateService.add(candidate);
sessionFactory.getCurrentSession().flush();
return candidate;

CandidateService marked as @Transactional;

Can you explain me why after execution of candidateService.add(candidate); candidate get id field value. Maybe it is normally?

candidateService.add(candidate) realization:

public void add(Candidate candidate) {
    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    String login = auth.getName();
     User user =  utilService.getOrSaveUser(login);
     candidate.setAuthor(user);
     candidateDao.add(candidate);
}

@Override
public Integer add(Candidate candidate) throws HibernateException{
    Session session = sessionFactory.getCurrentSession();
    if (candidate == null) {
        return null;
    }
    Integer id = (Integer) session.save(candidate);
    return id;

}

I thought it happened if candidate in persistent state.

I messed.

Upvotes: 0

Views: 769

Answers (1)

Suresh Atta
Suresh Atta

Reputation: 121998

Since the ID is primary key of the table candiate,when you add it to database a Id generates and returned by the save method.

If you see docs of save method.

Persist the given transient instance, first assigning a generated identifier. (Or using the current value of the identifier property if the assigned generator is used.) This operation cascades to associated instances if the association is mapped with cascade="save-update".

Returns: the generated identifier

Upvotes: 1

Related Questions