[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3630) When querying for component, Map collections inside components not loaded
When querying for component, Map collections inside components not loaded
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Key: HHH-3630
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3630
Project: Hibernate Core
Issue Type: Bug
Environment: 3.2.6-GA, Oracle and HSQLDB, JDK 1.5
Reporter: Gino Miceli
Attachments: hibernate-test.zip
Given the following mapping:
<code>
<class name="Car" table="CAR">
<id name="id" column="ID" type="long">
<generator class="native"/>
</id>
<property name="make" column="MAKE"/>
<property name="model" column="MODEL"/>
<component name="engine" class="Engine">
<property name="make" column="ENGINE_MAKE"/>
<property name="model" column="ENGINE_MODEL"/>
<map name="mountParts" table="ENGINE_MOUNT">
<key column="CAR_ID"/>
<map-key column="PART_NAME" type="string" />
<element column="PART" type="string" />
</map>
</component>
</class>
</code>
We are able to get the entire Car object in HQL like so:
<code>
select car from Car car where car.id=1
</code>
This generates the following SQL:
<code>
select
mountparts0_.CAR_ID as CAR1_0_,
mountparts0_.PART as PART0_,
mountparts0_.PART_NAME as PART3_0_
from
ENGINE_MOUNT mountparts0_
where
mountparts0_.CAR_ID=?
</code>
In this case, the map contained in the 'engine' component is loaded correctly. If
we query the component property directly, however:
<code>
select car.engine from Car car where car.id=1
</code>
Instances of Engine are returned, however the contained map is null. Looking at the SQL,
it appears not attempt is made to load the inner map property:
<code>
select
car0_.ENGINE_MAKE as col_0_0_,
car0_.ENGINE_MODEL as col_0_1_
from
CAR car0_
where
car0_.ID=1
</code>
Anyone?!
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