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From Łukasz Ostaniewicz (JIRA) <j...@apache.org>
Subject [jira] Created: (OPENJPA-1766) Polymorphic queries, selecting all childres - different result depending on select phrase
Date Fri, 13 Aug 2010 10:13:15 GMT
Polymorphic queries, selecting all childres - different result depending on select phrase
-----------------------------------------------------------------------------------------

                 Key: OPENJPA-1766
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1766
             Project: OpenJPA
          Issue Type: Bug
          Components: jpa
    Affects Versions: 2.0.0
         Environment: windows 7, jdk1.5.0_22
            Reporter: Łukasz Ostaniewicz
            Priority: Minor


I've got simple inheritance entity tree:
@Entity 
@Table(name = "mgruchmagazynowy", schema="magazyn")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="rodzaj",discriminatorType=DiscriminatorType.INTEGER,length=1)
public class RuchMagazynowy implements Serializable {
	(...)
}

@Entity
@DiscriminatorValue(value="0")
public class Dostawa extends RuchMagazynowy {
	(...)
}

@Entity
@DiscriminatorValue(value="1")
public class Wydanie extends RuchMagazynowy {
}

I've got two rows in "magazyn.mgruchmagazynowy" table: one with "rodzaj" set to 0 and one
with "rodzaj" set to 1

I'm trying to select all children (both Dostawa and Wydanie) and distinguish beetwen them:
iterating over the results and using .getClass() or instanceof. My JUNIT test looks like:
	List<Object[]> list = dao.findRM();
	for (int i = 0; i < list.size(); i++) {
		final Object[] row = (Object[]) list.get(i);
		final Class clazz1 = row[0].getClass();
		final Class clazz2 = row[1].getClass();
		log.info("class1:" + clazz1);
		log.info("class2:" + clazz2);
	}

The problem is: I cannot achieve this if I don't specify TYPE(u) amoung SELECT items on my
SELECT phrase. I thing the results of my both test cases should be equal (As I think, only
test case 2 results gives correct results).


TEST CASE 1:
	String select = "SELECT u,e FROM RuchMagazynowy u, ElementRuchuMagazynowego e " +
		" WHERE u.id = e.ruchMagazynowy.id  ";
	query = em.createQuery(select);
	List<Object[]> items = query.getResultList();

RESULT:
2890 [main] INFO org  - class1:class pl.imedia.magazyn.bo.RuchMagazynowy
2890 [main] INFO org  - class2:class pl.imedia.magazyn.bo.ElementRuchuMagazynowego
2890 [main] INFO org  - class1:class pl.imedia.magazyn.bo.RuchMagazynowy
2890 [main] INFO org  - class2:class pl.imedia.magazyn.bo.ElementRuchuMagazynowego


TEST CASE 2:
	String select = "SELECT u,e, TYPE(u) FROM RuchMagazynowy u, ElementRuchuMagazynowego e "
+
		" WHERE u.id = e.ruchMagazynowy.id ";
	query = em.createQuery(select);
	List<Object[]> items = query.getResultList();

RESULT:
2864 [main] INFO org  - class1:class pl.imedia.magazyn.bo.Dostawa
2864 [main] INFO org  - class2:class pl.imedia.magazyn.bo.ElementRuchuMagazynowego
2864 [main] INFO org  - class1:class pl.imedia.magazyn.bo.Wydanie
2864 [main] INFO org  - class2:class pl.imedia.magazyn.bo.ElementRuchuMagazynowego

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