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From "Matthew T. Adams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-652) Provision of a typesafe refactor-friendly query capability for JDOQL
Date Mon, 08 Nov 2010 14:20:14 GMT

    [ https://issues.apache.org/jira/browse/JDO-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929579#action_12929579

Matthew T. Adams commented on JDO-652:

Andy wrote:
1. Naming convention for generated "Query" classes. Currently prefixed by "Q" in this prototype

2. Way of obtaining candidate, parameter, variable, subquery. If the user wants to access
a field then they need to cast to the expression type. See the blog entry for details. Ideally
would like to avoid casting 

RE 1:  My personal recommendation for the the "Query" classes is to append the word Query
to end of the type.  Instead of QProduct, it would be ProductQuery.

RE 2:  I've been following your blog entries on this development work, and I agree on avoiding
casting.  Would it be possible to provide a method in the Q class that the user can call instead
of casting?  Perhaps a getField() method in the right place that returns a java.lang.reflect.Field.
 I'm not sure where the right place is yet, but in that method, the cast can take place and
at least the user wouldn't have to do any casting.  Thoughts?

> 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
> 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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