Foreign key & EJB3

[Duran Harris]

Hi,

I'm busy trying to visualize this JPA limitation:

JPA does not support unidirectional one-to-many relationships with the foreign key on the target table

So I devised the following unidirectional one-to-many relationship:

@Entity
public class Father
{

@ID
@Column(name="FATHER_ID")
protected int IdentityNum;


@OneToMany	
protected Set<Child> children;	
	


}



@Entity
public class Child
{
@ID
@Column(name="CHILD_ID")
protected int IdentityNum;


}    

How would I go about ensuring that there IS a foreign key on the target table?Isn't this only possible by making this bi-directional?The way I understand it...the only way that a foreign key will be stored in "CHILD" table is if the Child entity has a reference to the Father entity ie.

 protected Father father; 

But doing this would make the relationship bi-directional,hence the limitation wouldn't apply!How else can a foreign key be specified?

[Yair Ivan]

Hi Duran:

Reviews:

https://coderanch.com/t/163738/EJB-Certification-SCBCD/certification/EJB-Action-JPA

By.

[Duran Harris]

Thanks that explained it nicely