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From Michael Bouschen <mbo.t...@spree.de>
Subject JDOQL query problems (JPOX issues?)
Date Fri, 27 Oct 2006 21:12:46 GMT

I'm having problems running JDOQL queries that group by a variable. I 
think the queries below are valid, but I would like to double check 
this. If you agree that the queries are valid JDOQL, I will check the 
TCK to add these queries to existing TCK tests or add new test cases. I 
tried the queries with JPOX version 1.1.3 and with the nightly build 
from Oct 27 (no difference). I will send a test case to reproduce the 
problem to Erik and Andy, since I cannot attach archives here.

The class model is simple: pc class A has a field stringCol which is a 
collection of strings and another field bCol which is a collection of 
instances of class B.

The following query groups the class A instances by the strings in their 
string collection:
  Query q = pm.newQuery(A.class);
  q.declareVariables("java.lang.String str");
This results in an exception:
  JDOUserException: Unable to find the field "str" in the candidate 
class. It is possible that this field is a field in a subclass, but it 
is illegal to reference fields directly when they are in a subclass.

I get a different exception when adding an aggregate to the result clause
  q.setResult("str, count(this)");
  JDOUserException: Unconstrained variable referenced: str

The behavior is different when iterating a collection of pc instances:
   Query q = pm.newQuery(A.class);
   q.declareVariables("model.B b");
   q.setResult("count(this), b");
This results in:
  JDOUserException: The result clause has a field expression 
"UnboundVariable "UNBOUND_B.ID"" that doesnt appear in the grouping. Any 
result specification has to be present in the grouping when grouping is 

Any help is appreciated. Thanks!

Regards Michael

Michael Bouschen		Tech@Spree Engineering GmbH
mailto:mbo.tech@spree.de	http://www.tech.spree.de/
Tel.:++49/30/235 520-33		Buelowstr. 66			
Fax.:++49/30/2175 2012		D-10783 Berlin			

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