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From "Albert Lee (Closed) (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (OPENJPA-487) Generated SUBSTRING SQL is ugly and inefficient
Date Thu, 02 Feb 2012 16:24:51 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Albert Lee closed OPENJPA-487.
------------------------------


Close issue in preparation for 2.2.0 release.
                
> Generated SUBSTRING SQL is ugly and inefficient
> -----------------------------------------------
>
>                 Key: OPENJPA-487
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-487
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 0.9.0, 0.9.6, 0.9.7, 1.0.0, 1.0.1, 1.0.2, 1.1.0
>            Reporter: Patrick Linskey
>            Assignee: Milosz Tylenda
>            Priority: Minor
>             Fix For: 2.2.0
>
>         Attachments: handle_params_in_group_by.patch
>
>
> When performing a JPQL query with a SUBSTRING clause, OpenJPA converts from one-based
index + length parameters to zero-based index + end index for internal handling, and then
re-converts back to one-based + length when generating SQL. This conversion is entirely performed
in query values, so the generated SQL has a lot of math in it. This extra math is never necessary.

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