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From "Albert Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OPENJPA-2449) refresh(PESSIMISTIC_WRITE) generates seperate SQL for the lock
Date Tue, 05 Nov 2013 18:31:17 GMT
Albert Lee created OPENJPA-2449:
-----------------------------------

             Summary: refresh(PESSIMISTIC_WRITE) generates seperate SQL for the lock
                 Key: OPENJPA-2449
                 URL: https://issues.apache.org/jira/browse/OPENJPA-2449
             Project: OpenJPA
          Issue Type: Improvement
          Components: jdbc, kernel
    Affects Versions: 2.1.2, 2.2.1.1, 2.2.3, 2.3.1, 2.4.0
            Reporter: Albert Lee
            Priority: Minor


Simple refresh(PESSIMISTIC_WRITE) generates multiple SQL statements. E.g.

    em.refresh(t1, LockModeType.PESSIMISTIC_WRITE);
    //SELECT t0.CMLT_FOLDER_CONTEXT_UPDATE_TMS, t0.CRE_TIME FROM T1 t0 WHERE t0.c1 = ?  [params=(String)
c1]
    //SELECT t0.c1 FROM T1 t0 WHERE t0.c1 = ?  FOR READ ONLY WITH RR USE AND KEEP UPDATE LOCKS
[params=(String) c1]

It would be nice if a single SQL is executed to optimize SQL execution and chances that another
thread may compete to lock the same row.



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