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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] Closed: (OPENJPA-1684) Prepared query cache won't work if the start index (i.e setFirstResult) is changed
Date Tue, 13 Jul 2010 16:43:49 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Curtis closed OPENJPA-1684.
--------------------------------

      Assignee: Rick Curtis
    Resolution: Cannot Reproduce

Closing this issue as I'm unable to reproduce the reported problem. Please reopen if you're
able to put together a unit test.

> Prepared query cache won't work if the start index (i.e setFirstResult) is changed
> ----------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1684
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1684
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: query
>    Affects Versions: 2.0.0
>         Environment: Ubuntu 9.04, Sun jdk6, database: H2 
>            Reporter: Waruna Ranasinghe
>            Assignee: Rick Curtis
>
> I have implemented pagination so that only 6 entries are fetched for a page.
> First, I get the first 6 entries (First page: from 0 to 6) by setting ;
>     query = query.setFirstResult(startIndex); //startindex = 0
>     query = query.setMaxResults(pageSize); //pageSize = 6
> Then the db query is sent as follow: 
>     SELECT t0.id FROM ....... LIMIT ?
> And the above sql is cached against its JPQL
> When I try to get the next page (Second page: from 6 to 12) by setting;
>     query = query.setFirstResult(startIndex); //startindex = 6
>     query = query.setMaxResults(pageSize); //pageSize = 6
> Then the db query is still sent as follow: 
>     SELECT t0.id FROM ....... LIMIT ?
> Where as it should be 
>       SELECT t0.id FROM ....... LIMIT ? OFFSET ?
> This problem occurs because it takes the SQL query from the cache against the JPQL (JPQL
is same as the first) which returns the old SQL query in which there was no any OFFSET keyword
set.
> This can be fixed by setting the OFFSET value (in H2) to zero even if it is the default
value OR setting the relevant keyword (OFFSET in H2, LIMIT in MySQL) to default, so that it
can be taken from the cache and the changed offset values will be set without a problem.
>     

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