Question

BIG UPDATE:

Ok, I see my problem is much more complicated than I thought. I have tables like this:

Patient:
id
bloodtype
level (FK to level table)
doctor (FK to doctor table)
person (FK to person table)

Doctor:
id
person (FK)
speciality
level (FK to level)

Paramedic:
id
person (FK)

Person:
id
name
surname

Account:
id
login
pass

Level:
id
account (FK)
name (one of: 'patient' , 'paramedic' , 'doctor')

In entity class I’m using now @Inheritance(strategy= InheritanceType.JOINED)
@DiscriminatorColumn(discriminatorType=DiscriminatorType.STRING,name="name") in class Level. To check if someone is for ex. patient I have function:

public boolean ifPatient(String login) {
    account = accountfacade.getByLogin(login);
    for (Level l : account.getLevelCollection()) {
        if (l instanceof Patient) {
            return true;
        }
    }
    return false;
}

Now I have situation: I’m logged in as a doctor. I want to add a patient. I have something like this:

public Doctor findDoctor(String login) {
        account = accountfacade.getByLogin(login);
        for (Doctor d : doctorfacade.findAll()) {
            if (d.getLevel().getAccount().getLogin().equals(login)) {
                doctor = d;
                return doctor;
            }
        }
    }
@Override
    public void addPatient(Account acc, Patient pat, Person per, String login) {
    Doctor d = findDoctor(login);
    accountfacade.create(acc);
    personfacade.create(per);
    Patient p = new Patient();
    p.setAccount(acc);
    p.setBlood(pat.getBlood());
// etc
    p.setPerson(per);
    d.getPatientCollection().add(p);
    acc.getLevelCollection().add(p);
    }

But it doesn’t work. Always totally weird errors like duplicate value of primary key in table Account (but I use TableGenerator…) or NULL value in field Account but for INSERT INTO Doctor (how?! I’m creating new Patient, NOT Doctor…). I’m totally lost now, so I think most important for me now is to know if actually I can use InheritanceType.JOINED in this case.

Answer 1

Ok, I’ve done what I wanted. It’s not elegant, but efficient. Tables and inheritance strategy are the same. In endpoint I create account and person entities, then I create Patient entity but using EntityManager persist() method. I also need to set id of level manually ((Integer)poziomfacade.getEntityManager().createQuery("SELECT max(p.idpoziom) FROM PoziomDostepu p").getSingleResult())+1 because Generator in Level entity class doesn’t work. Nevertheless the problem is solved, thanks for every constructive comment or answer.