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Re: [eclipselink-users] Composite foreign primary key in 3 tables
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Hello,
The specification states you should have A's id within the BPK class,
not A itself. The same goes for CPK, it should contain int time and BPK
b as attributes.
Please feel free to file a bug to have the error message improved if
changing this resolves the problem.
Best Regards,
Chris
On 24/06/2010 3:15 AM, Horat wrote:
Hello,
I have three tables:
Table A:
id (PK)
Table B:
aid (FK from A, PK)
num (PK)
Table C:
aid (FK from A, PK)
bnum (FK from B, PK)
time (PK)
With eclipselink i have annotated the ManyToOne-relation from B to A as
follows:
@Entity
public class A {
@Id
public int id;
}
@IdClass (BPK.class)
@Entity
public class B {
@Id
@ManyToOne
@JoinColumn (name="aid" referencedColumnName="id")
public A a;
@Id
public int num;
}
With BPK as the IdClass containing a and num.
This does work as intended!
For table C I annotated the ManyToOne-relation from C to B as follows:
@IdClass (CPK.class)
@Entity
public class C {
@Id
@ManyToOne
@JoinColumns ({ @JoinColumn (name="aid", referencedColumnName="aid"),
@JoinColumn(name="bnum", referencedColumnName="num") })
public B b;
@Id
public int time;
}
With CPK being the IcClass containing B and time.
When I try to run this I get an error:
org.eclipse.persistence.exceptions.ValidationException
Exception Description: The composite primary key attribute [b] of type
[null] on entity class [class C] should be of the same type as defined on
its primary key class [CPK]. That is, it should be of type [B].
I don't get it why the type of b is null. Obviously it is not.
Am I missing out anything?
Thanks for replying.
