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Posted to dev@openjpa.apache.org by "Xiaoqin Feng (JIRA)" <ji...@apache.org> on 2009/12/28 19:37:29 UTC
[jira] Commented: (OPENJPA-1440) Allow COUNT(*) instead of
COUNT(t0.id) for simple queries as an option
[ https://issues.apache.org/jira/browse/OPENJPA-1440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794853#action_12794853 ]
Xiaoqin Feng commented on OPENJPA-1440:
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> Allow COUNT(*) instead of COUNT(t0.id) for simple queries as an option
> ----------------------------------------------------------------------
>
> Key: OPENJPA-1440
> URL: https://issues.apache.org/jira/browse/OPENJPA-1440
> Project: OpenJPA
> Issue Type: Improvement
> Reporter: Pinaki Poddar
> Assignee: Pinaki Poddar
>
> SQL generated for "select p for PObject p" is SELECT COUNT(t0.id) FROM POBJECT t0". This is valid and according to JPQL spec which does not accept COUNT(*).
> However, JDBC Drivers for legacy databases may not always support COUNT(columnName) as reported in [1].
> OpenJPA should support such cases with a boolean option DBDictionary.useWildCardForCount.
> [1] http://n2.nabble.com/COUNT-t-to-COUNT-tc4176827.html#a4176827
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