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https://issues.apache.org/jira/browse/JDO-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036377#comment-13036377
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Michael Bouschen commented on JDO-652:
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I looked at the JDOQL "typesafe" query API.
The expression syntax is looking good, but I have some questions about the
handling of query parameters and specifying the query result. My concern is
that the typesafe query API is using a very different aproach compared to the
regular JDO queries.
- Parameter handling:
The typesafe query API uses a method setParameter to set the parameter value,
meaning the parameters values are part of the state of the TypesafeQuery
instance. With JDO queries parameter values are passed as arguments to the
Query.execute call and not stored in the Query state.
- Query result specification:
The typesafe query API used a special execute method executeResultList to
specify the query result, e.g. tq.executeResultList(String.class, false,
cand.lastname). At first glance this looks like an execute call taking
parameter values, but it is not. The reason might be, that this aproach allows
tempating on the query result. An alternative would be specifying the query
result type as a tempate argument of the TypesafeQuery instance, in addition to
the candidate class.
What do you think?
> Provision of a typesafe refactor-friendly query capability for JDOQL
> --------------------------------------------------------------------
>
> Key: JDO-652
> URL: https://issues.apache.org/jira/browse/JDO-652
> Project: JDO
> Issue Type: New Feature
> Components: api, specification, tck
> Reporter: Andy Jefferson
> Fix For: JDO 3 maintenance release 1
>
> Attachments: typesafe.patch, typesafe_manifest.patch
>
>
> There are various querying capabilities of this type around. JPA2 has its
> Criteria query API. Third party solutions like QueryDSL also exist, in its
> case providing a JDOQL implementation (as well as JPQL, and HQL). We should
> seriously consider introducing something along these lines in the JDO2.4
> timeframe.
> There is a comparison of JPA Criteria with QueryDSL over at
> http://source.mysema.com/forum/mvnforum/viewthread_thread,49
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