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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-652) Provision of a statically-typed refactor-friendly query capability for JDOQL
Date Fri, 02 Jul 2010 07:16:16 GMT

    [ https://issues.apache.org/jira/browse/JDO-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884572#action_12884572
] 

Andy Jefferson commented on JDO-652:
------------------------------------

@Matthew, you open Eclipse (and set it up to have the annotation processor enabled). You write
a model class ("Person"). When pressing "Save" Eclipse will attempt to compile it. Prior to
compilation all files to be compiled that have the required annotations (@PersistenceCapable)
are passed to the annotation processor(s). The annotation processor generates the equivalent
query source code (QPerson). The compiler then compiles all classes (model + query).

When compilation has finished the user starts to write a persistence class. They can reference
Person and QPerson since both are compiled classes.

> 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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