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https://issues.apache.org/jira/browse/JDO-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608457#comment-16608457
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Michael Bouschen commented on JDO-652:
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Thanks for the link Andy.
Following your proposal, I'm struggling with numeric types. Suppose I have an
Employee query with filter: "this.salary > (IF (this.department.name ==
'Development') 15000.0 ELSE 25000.0)". Then the JDOQLTypedQuery would look like
{noformat}
JDOQLTypedQuery<Employee> query = getPM().newJDOQLTypedQuery(Employee.class);
QEmployee cand = QEmployee.candidate();
IfElseExpression<Double> ifExpr = query.ifElseExpression(Double.class);
ifExpr.ifThen(cand.department.name.eq("Development"), 15000.0).elseEnd(25000.0);
query.filter(cand.salary.gt(ifExpr));{noformat}
But the expression "cand.salary.gt(ifExpr)" does not compile. The compiler
complains that there is not method gt taking a IfElseExpression<Double>. It
would compile if the gt argumnet would be of type IfElseExpression<Number>.
Do you have an idea?
> 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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