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https://issues.apache.org/jira/browse/JDO-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926213#action_12926213
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Andy Jefferson commented on JDO-652:
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Re: developing model and query objects, if someone wants to give it a try they
can put
"datanucleus-jdo-query.jar" (available in the DN nightly repo) in the Eclipse
annotation processor jar list, enable JDK1.6 compliance, and also have
"datanucleus-core.jar" in the CLASSPATH. They can then create a model class
(e.g Product.java) and start writing persistence code that refers to QProduct,
such as
QProduct qp = QProduct.candidate;
and start making references to "qp" and its various methods ... see
http://datanucleus.blogspot.com/2010/07/jdo-typesafe-refactorable-queries.html
for the expressions. This is the basis for the various clauses of the proposed
query API
Note this is not currently a full working prototype, it just allows creation of
the dynamic query objects and can demonstrate the access of fields, use of
methods and relations etc.
> Provision of a statically-typed 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
>
>
> 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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