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From "Jody Grassel (JIRA)" <>
Subject [jira] [Created] (OPENJPA-2261) Query SQL Cache issue with NULL parameters
Date Mon, 10 Sep 2012 16:52:07 GMT
Jody Grassel created OPENJPA-2261:

             Summary: Query SQL Cache issue with NULL parameters
                 Key: OPENJPA-2261
             Project: OpenJPA
          Issue Type: Bug
          Components: query
    Affects Versions: 2.2.0, 2.1.1, 2.1.0
            Reporter: Jody Grassel
            Assignee: Jody Grassel

The Query SQL Cache matches previously executed SQL for a given JPQL by using the JPQL string
itself for the key.  As long as none of the predicate parameters are NULL, this is fine, as
the prepared statement's SQL remains unchanged.  Since SQL requires "column IS NULL" statements
and not "column = NULL", the approach used by OpenJPA's Query SQL Cache breaks and results
with bad getResultList() returns.

In the future (say, trunk), the Query SQL Cache needs more intelligence to handle this situation,
but for service releases the best way to handle this issue is to disqualify queries with NULL
parameters from the query cache.     

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