'One' To 'Many' relationship, (with the 'One' shared between persistance object graphs)

Question

Hi,
I'm relatively new to JDO. So I need some verification on my program design.
When creating a new Persistence Object I'm using a 'Builder' design pattern
to check the database for an object that equals the new objects bean
parameters(Via a JDOQL query). If it finds a matching one it loads it
otherwise it creates a new instance.
This way I have common objects between Persistence Object graphs. And there
is not repeated common objects in the database.
Is there a better way?
regards
Graham Cruickshanks

Answer 1

// Doesn't workWhat does not work? What error do you get?
You need to use "join" to define a join.
CriteriaQuery<Competence> cq = cb.createQuery(Competence.class);
Root<Competence> competence = cq.from(Competence.class);
Join<CompetenceName> name = competence.join(Competence_.competenceNames);
cq.orderBy(cb.asc(name.get(CompetenceName_.name));
The "fetch" will do a fetch join, if you also wish to load the data in the same query.
James : http://www.eclipselink.org