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 Post subject: Collection batch loading with custom sql-query loader
PostPosted: Wed Mar 16, 2011 10:44 am 
Newbie

Joined: Wed Mar 16, 2011 9:45 am
Posts: 1
Hi All,

I have an entity with a mapped collection like below:
<class name="Game">
...
...
<set name="codes" inverse="true" lazy="true" cascade="all" >
<cache usage="read-write"/>
<key>
<column name="GAME_ID" not-null="true" />
</key>
<one-to-many class="GameCode"/>
<loader query-ref="loaderQuery" />
</set>
</class>

<sql-query name="loaderQuery" cacheable="true">
<load-collection alias="cds" role="Game.codes" />
SELECT {cds.*}
FROM game_code cds
WHERE cds.game_id = ?
AND cds.code_revision = (SELECT MAX (revision)
FROM game_code a
WHERE a.game_id = cds.game_id AND a.code_id = cds.code_id)
ORDER BY cds.code_id ASC
</sql-query>

Everything is working fine, but on multiple Game loads the generated queries are quite inefficient. Adding batch-size attribute in the collection mapping would normally do the trick, but unfortunately when a custom loader is defined the batch-size seems to be ignored.

When I remove the <loader query-ref="loaderQuery"> and add the a batch-size everything works fine, but it doesn't cover my business needs.

Does anybody have an idea if there is a hook somewhere in Hibernate that I can add my custom batch loading code, or if I am doing something terribly wrong and there is a quick workaround/fix?

I'm using Hibernate 3.3.2.GA.

Thanks in advance,


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