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OneToMany two times [message #454260]

Sat, 01 August 2009 17:26

Omar Diego Vera Ustariz

Messages: 4
Registered: July 2009

Junior Member

Hi all,

I am writing my entities and due to my modeling I have a OneToMany
relationship between two Entities, of course both relationships have a
different meaning. However when I see the data base only one table with
three columns was created representing the relationship. I was expecting
to have two relationship tables each representing a relationship. Is there
a way to model two OneToMany relationships between two Entities creating a
different table for every relationship?

Thanks in advance,

-Omar Diego

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Re: OneToMany two times [message #480783 is a reply to message #454260]

Tue, 18 August 2009 13:21

James Sutherland

Messages: 1939
Registered: July 2009
Location: Ottawa, Canada

Senior Member

You must use the @JoinTable annotation whenever you have two
OneToMany/ManyToMany relationships to the same class. This is because the
JPA defined defaulting auto-mapping rules require using the
<source>_<target> as the default table name, as normally it is the best
name to use, but of course does not work if you have multiple
relationships.

Also please log a bug that a warning or error message should be logged if
there are multiple OneToMany/ManyToMany relationships to the same class
(or a different naming strategy should be used in the case of multiple).

---
James

James : Wiki : Book : Blog : Twitter

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