[jira] Commented: (JDO-650) Support for conditional operator ? : in JDOQL

["Timo Westkämper (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JDO-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785812#action_12785812 ] 

Timo Westkämper commented on JDO-650:
-------------------------------------

The proposed syntax gets a bit tricky with longer expressions

case
  when salary < 100 then "bronze"
  when salary < 1000 then "silver"
  when salary < 10000 then "gold"
  else "platinum"
end

becomes

salary < 100 ? "bronze" : ( salary < 1000 ? "silver" : ( salary < 10000 ? "gold" : "platinum" )) 

Querydsl uses the case-when-else-end form.

> Support for conditional operator ? : in JDOQL
> ---------------------------------------------
>
>                 Key: JDO-650
>                 URL: https://issues.apache.org/jira/browse/JDO-650
>             Project: JDO
>          Issue Type: New Feature
>          Components: specification, tck2
>    Affects Versions: JDO 2 maintenance release 2
>            Reporter: Michael Bouschen
>            Assignee: Michael Bouschen
>
> JDOQL should support the Java conditional operator ? :, e.g. salay >= 1000.0 ? salary : salary * 1.1
> The conditional operator can be mapped to the CASE-expression in SQL: CASE WHEN condition THEN thenExpr ELSE elseExpr END. Are there any issues with non-SQL datastores when supporting the conditional operator? 
> Another question: which part of a JDOQL query can include a conditional expression? I propose the query filter, the having clause and the result specification.

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