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ManyToOne only have the IDs in a collection not the whole object [message #454344]

Sat, 01 August 2009 17:43

Philipp Kursawe

Messages: 135
Registered: July 2009

Senior Member

Hello!

I wonder if its possible to fetch only the IDs of the associated
collection objects instead of the full blown entity. Lets say I have a
User object hat can have 0..n orders assigned to him. But I only want to
have the order IDs in the collection in the User entity.
Collection<String> orders;
instead of
Collection<UserOrder> orders;

Any ideas?

Thanks
Phil

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Re: ManyToOne only have the IDs in a collection not the whole object [message #480785 is a reply to message #454344]

Tue, 18 August 2009 13:37

James Sutherland

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

Senior Member

You can use a @BasicCollection in EclipseLink (1.1) or an
@ElementCollection in JPA 2.0 (EclipseLink 2.0) to define this type of
relationship. You would probably also want to make the relationship
read-only.

---
James

James : Wiki : Book : Blog : Twitter

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