How to query on object

Question

Hi, there
I was doing something following the example on this link:
http://www.solarmetric.com/Software/Documentation/3.4.0/docs/jdo_overview_query_advfilter.html
the codes (simplified from original):
PersistenceManager pm = ...;
Company comp = ...;
Query query = pm.newQuery (Magazine.class,
"publisher == :pub");
Collection mags = (Collection) query.execute (comp);
Caused kodo to generate a select:
SELECT .... FROM MagazineTBL t0, PublisherTBL t1 WHERE (t0.publisherID IS
NULL) AND t0.publisherID = t1.publisherID(+)
This of course does not work. Any ideas?

Answer 1

Thomas,
We're asking for the actual code as this should work (and does in our
internal tests). Most likely there is some small error in how you are
constructing and executing the query which is causing the odd behavior.
If you are uncomfortable posting your code here, send us a complete
compilable/runnable test case to [email protected]
Thomas wrote:
>
Other than different "names". I pretty much have the exactly same codes.
The idea is simple, straightforward. Magazine HAS A publisher so in
Magazine table there is a column referencing to a row in the publisher
table. In SQL, you join on the foreign key. I am just wondering if it's
possible (it should be according to the docs) to join on the object in
JDOQL. i.e. when querying for magazines: "piblisher =
:aParticularPublisher".
What already works for me is: "piblisher.ID = " +
aParticularPublisher.getID()
Which is fine. whatever works - just kind of dispointed that after all
these big talks we just end up doing the same. It's embeding sql anyway.