| 回复： [eclipselink-users] How to save a specific instance of an Entity |
may be you just need another entity, say ServiceInstance.
在 2010-5-31 下午4:03，"RogerV" <roger.varley@xxxxxxxxxxxxxx>编写：
Hi
I've got two entities. @Entity ServiceDefinition which comprises parameters
that control the flow of a program to perform a service. Because the
execution of the service can fail, I have my second entity
@Entity
public class ServiceTransaction {
private ServiceDefinition serviceDefinition;
.. getters/setters
}
What I want to store in ServiceTransaction is not a pointer to the
definition held in @Entity ServiceDefinition but the specific instance of
ServiceDefinition that I'm using (because ServiceDefinition could change).
In addition I would like to store the instance as an object rather than as a
collection of data elements so that I can restore its state. At runtime
Eclipselink is complaining that I don't have join details defined between
ServiceTransaction and ServiceDefinition.
Is it possible to do what I want, and if so, how?
Regards
--
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