Hello,
apart from my previous posting concerning nested queries
with subqueries over extents, I have some more questions
about nested queries.
In the method
Criteria.addIn(String attributeName, Query subQuery)
is the specified attribute allowed to be a collection
attribute? (The method is not used in any of the tests,
so it is difficult to tell.)
If not, how am I supposed to get by without?
Say I have a (sub)query q that specifies a set
of persons, and I want to query for all projects
that have a person that fulfils q.
In my situation, the relation under consideration is
1-n, so I do not need an indirection table.
I could use a different feature I would like to
call 'projection':
Give me (distinctly) the set of all project_id values
for all persons that fulfil q.
Queries of the above type are also required by OQL,
so I wonder if OJB supports them. I have not
found it. I would expect a method
Collection Query.projectTo(String attributeName)
to do that.
Can anybody help me? Can we implement such a feature?
Olli
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