JPA导航单向关系

Question

I have an unidirectional relationship. Here i have Employee and Andress entities. In Employee entity i have the following code:

@OneToOne(cascade=CascadeType.ALL)
@JoinColumn(name = "HOME_ADDRESS")
private Address homeAddress;

What is the correct way to find the Employee entity when i have only the Adress entity. Can I only do that via jpql?

Answer 1

You could do it like this if you have, for example, the id of the address

select e from Employee e where e.homeAddress.id = :addressId

Using Hibernate criteria API, it would look like this

Criteria criteria = session.createCriteria(Employee.class);
criteria.createAlias("homeAddress", "homeAddress");
criteria.add(Restrictions.eq("homeAddress.id", addressId);
Employee employee = (Employee)criteria.uniqueResult();