Hello,
I have observed a behaviour in the PB query engine which
could be improved in my opinion.
I have a persistence-capable class 'Node' with a reference
'parentNode' of type 'Node' (suitable to build a tree).
As usual with OJB, there is a (private) field 'parentNode_refid'
whose type corresponds to the primary key of class Node. (long
in my case.) Here is a excerpt from my repository.xml:
<field-descriptor name="parentNode_refid" ... />
<reference-descriptor name="parentNode" class-ref="Node">
<foreignkey field-ref="parentNode_refid"/>
</reference-descriptor>
I want to formulate a query for all nodes that do not
have a parent node. What I consider canaconical from the
documentation was:
criteria.addIsNull("parentNode"); // does not work
But that does not work. Unfortunately, I does not through
an exception either. The query will just return no objects.
What I have to write is:
crit.addEqualTo("parentNode_refid", new Integer(0));
which is somewhat ugly because it uses the "secret" auxiliary
reference which I would like to hide from the developer.
(It is no big deal for our project because we have a
layer on top of OJB where I can easily hide this.)
What do you think?
Olli
--
Oliver Matz
ppi Media GmbH
Deliusstra�e 10
D-24114 Kiel
phone +49 (0) 43 1-53 53-422
fax +49 (0) 43 1-53 53-2 22
email mailto:[EMAIL PROTECTED]
web www.ppi.de
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
