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From vld <knezevicvladi...@yahoo.com>
Subject JoinColumn name not used in sql
Date Wed, 28 Apr 2010 14:21:24 GMT

Hi!

I have a problem with mapping many-to-one relationship without exact foreign
key constraint set in database. I use OpenJPA implementation with MySql
database, but the problem is with generated sql scripts for insert and
select statements.

I have LegalEntity table which contains RootId column (among others). I also
have Address table which has LegalEntityId column which is not nullable, and
which should contain values referencing LegalEntity's "RootId" column, but
without any database constraint (foreign key) set.

Address entity is mapped:
@Entity
@Table(name="address")
public class Address implements Serializable {
    ...

    @ManyToOne(fetch=FetchType.LAZY, optional=false)
    @JoinColumn(referencedColumnName="RootId", name="LegalEntityId",
nullable=false, insertable=true, updatable=true, table="LegalEntity")
    public LegalEntity getLegalEntity() {
        return this.legalEntity;
    }
}

SELECT statement (when fetching LegalEntity's addresses) and INSERT statment
are generated:
- SELECT t0.Id, .., t0.LEGALENTITY_ID FROM address t0 WHERE
t0.LEGALENTITY_ID = ? ORDER BY t0.Id DESC [params=(int) 2]
- INSERT INTO address (..., LEGALENTITY_ID) VALUES (..., ?) [params=...,
(int) 2]

If I omit table attribute from mentioned statements are generated:
- SELECT t0.Id, ... FROM address t0 INNER JOIN legalentity t1 ON
t0.LegalEntityId = t1.RootId WHERE t1.Id = ? ORDER BY t0.Id DESC
[params=(int) 2]
- INSERT INTO address (...) VALUES (...) [params=...]

So, LegalEntityId is not included in any of the statements.

Is it possible to have relationship based on such referencing (to column
other than primary key, without foreign key in database)? Is there something
else missing?

Thanks in advance.
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