[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3400) hql insert doesn't work when inserting into a table with composite-id

[Ning Zhang (JIRA)]

hql insert doesn't work when inserting into a table with composite-id
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                 Key: HHH-3400
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3400
             Project: Hibernate3
          Issue Type: Bug
          Components: query-hql
    Affects Versions: 3.2.6
         Environment: 3.2.6GA, any database
            Reporter: Ning Zhang


I have a table serving as an association table, so the Id of the table is just the ids from the linked tables. The mapping file looks like:

    <class  name="UserPt" table="user_pt" >
        <composite-id>
            <key-property name="userId" type="java.lang.Long" column="user_id"/>
            <key-property name="ptId" type="java.lang.Long" column="pt_id"/>
        </composite-id>
    </class>

And I need to run some HQL to insert the association into the table like:

INSERT INTO UserPt(userId, ptId) SELECT user.id, pt.id FROM...........

Because of the complicated logic we have in the FROM statement, we cannot do this just by using collection mapping. When I run this HQL, it gives an error saying:

"can only generate ids as part of bulk insert with either sequence or post-insert style generators".

It looks like the hibernate is think the id is not set. I have tried different approaches like creating an separate id class, setting "mapped" to true, etc. But none of it solve the problem. The only thing I can do is defining a fake id in the hibernate mapping, which may introduce some problem in the future. 

I would appreciate if someone can fix this issue or having some better work around for it. Thanks a lot.

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