Re: [eclipselink-users] Load mapping file at "runtime"

[Christian August Michelsen <chris-m@xxxxxxx>]

Den 05.10.2010 17:35, skrev Tom Ware:
> Hi Christian,
>
> Is it possible to have multiple persitence units that have the same
> entities, but different orm xml files that override the mappings and
> just select the persistence unit that has the override you need.
>
> It is possible to alter the underlying EclipseLink metadata after your
> peristence unit is created, but you need to be careful because there is
> quite alot of code that runs at initialization time to make sure
> everything is consistence. Changing the field a BasicMapping maps to
> should be fairlyl easy, but if you get into changing relationships
> mappings or mappings within InheritanceHierarchies, you will have to be
> quite careful.
>
> org.eclipse.persistence.jpa.JpaHelper has a getServerSession() method
> that can get our underlying session. Session has a project and project
> has a list of mappings that can be acquired by name. Changing the
> mappings is a matter of calling the appropriate methods on the various
> mappings you get back.


Thank you :-)
+1 beer for you.

--
Kind regards
Christian Michelsen