双向OneToOne中的相同实体

Question

I'm trying to find a solution about this problem: I have a relationship table that map the rules of another entity.

    @Entity
public class Relation {
   @Id
   public Long id;
   @OneToOne
   public Address addressHome;
   @OneToOne
   public Address addressWork
}

and a class Address

@Entity
    public class Address {
       @Id
       public Long id;
    }

I would put a bidirectional relation from Address to relation.

Can someone help me? Thanks

Answer 1

What you need to do is telling Hibernate the relation between Address and Relation : first you need to implement this into Relation:

@Entity
public class Relation {
    @Id
    public Long id;

    @OneToOne
    @JoinColumn(name = "addressHome", referencedColumnName = "id")
    public Address addressHome;

    @OneToOne
    @JoinColumn(name = "addressWork", referencedColumnName = "id")
    public Address addressWork;
}

Then you need to edit your Address class like this:

@Entity
public class Address {
   @Id
   public Long id;

   @OneToOne(mappedBy = "addressHome")
   public Relation relationHome;

   @OneToOne(mappedBy = "addressWork")
   public Relation relationWork;
}

If you prefer you can put the annotations on getter instead on variable.

Answer 2

I don't have enough reputation to comment, but assuming this is all that you have in your code, It should work in that way, maybe you are forgetting the @JoinColumn label specifying the name of the database fields. I suggest to put more information about how your data model is related.