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https://issues.apache.org/jira/browse/JDO-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16605781#comment-16605781
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Andy Jefferson commented on JDO-652:
------------------------------------
See
[https://github.com/datanucleus/javax.jdo/commit/34129e8c995db533545a1e882823edffd0a4c204]
for a prototype of If-Else handling. This means that you can write such as
the following
{{ JDOQLTypedQuery<Person> tq = pm.newJDOQLTypedQuery(Person.class);}}
{{ QPerson cand = QPerson.jdoCandidate;}}
{{ IfElseExpression<String> ageGroupExpr =
tq.ifElseExpression(String.class);}}
{{ ageGroupExpr.ifThen(cand.age.lt(21), "Student");}}
{{ ageGroupExpr.ifThen(cand.age.ge(21).and(cand.age.lt(65)), "Worker");}}
{{ ageGroupExpr.elseEnd("Retired");}}
{{ tq.result(false, ageGroupExpr);}}
> 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
> Assignee: Michael Bouschen
> Priority: Major
> Fix For: JDO 3.2
>
> Attachments: JDO-652-api-patch-Andy.txt, JDO-652-patch3.txt,
> 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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