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From "Michael Dick (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (OPENJPA-590) The push-down sql for JPQL has unpredictable ordering in the set clause for update statement
Date Mon, 05 May 2008 20:53:55 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dick resolved OPENJPA-590.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 1.2.0

> The push-down sql for JPQL has unpredictable ordering in the set clause for update statement
> --------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-590
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-590
>             Project: OpenJPA
>          Issue Type: Bug
>            Reporter: Fay Wang
>            Assignee: Michael Dick
>             Fix For: 1.2.0
>
>         Attachments: openjpa.patch
>
>
>       Our application requires the push-down sql from named/dynamic query be the same
each time a same JPQL is executed. 
> In the following JPQL example, however, 
> 	
>       query="UPDATE BasicA t set t.name= ?1, t.age = ?2 WHERE t.id = ?3"
>       we observe that two different push-down sql could be generated:
>       
>       UPDATE PDQBasicA t0 SET name = ?, age = ? WHERE (t0.id = ?)
>       UPDATE PDQBasicA t0 SET age = ?, name = ? WHERE (t0.id = ?)
>       This unpredictable behavior breaks our application. The indeterministic ordering
of the update list is due to the indeterministic ordering provided by HashMap and HashSet
in QueryExpressions and JPQLExpressionBuilder, respectively.
>       When the HashMap is changed to LinkedHashMap and HashSet to LinkedHashSet, the
access order based on insertion will be preserved and the generated push-down sql will have
predictable ordering of update list. The attached patch fixes this problem.

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