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From "Daniel Lee (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-421) OpenJPA generates bad SQL before configuration fully populated
Date Sat, 27 Oct 2007 00:36:50 GMT
OpenJPA generates bad SQL before configuration fully populated
--------------------------------------------------------------

                 Key: OPENJPA-421
                 URL: https://issues.apache.org/jira/browse/OPENJPA-421
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
    Affects Versions: 1.0.0, 1.0.1, 1.1.0
            Reporter: Daniel Lee
             Fix For: 1.1.0


When openjpa.jdbc.DBDictionary is set in persistence.xml file, OpenJPA creates a new DBDictionary
instance by loading the class specified in the properties without trying to connect to database.
  It leaves version related configuration unset until the first connection to the database
and creates the window of referencing partial properties in the DBDictionary.  The problem
happens when the first sql statement gets constructed within this window with lack of the
knowledge of the version of the database.

For example, with the setting that described below, BIGINT was generated in the
SQL statement to be run on DB2 z/OS V8 and failed to execute because BIGINT was not supported
on that version of z/OS DB2.

1. commenting out the setting of "openjpa.jdbc.SynchronizeMappings".
2. configure the connection properties to a z/OS database
3. issuing a statement similar to the following to generate SQL statement with
   "CAST(? AS BIGINT)".

Here is the testcase that I use to create the problem:
{
    EntityManagerFactory emf1 = 
        Persistence.createEntityManagerFactory("demo");
    EntityManager em1 = emf1.createEntityManager();
    em1.getTransaction().begin();
    Order o3 = (Order) em1.createQuery(
        "select o from Order o where o.oid = 68").getSingleResult();
    ...
}

==>
  SELECT t0.oid, t0.version, t0.amount, t0.delivered FROM Order t0
    WHERE (t0.oid = CAST(? AS BIGINT)) optimize for 1 row [params=(long) 68]


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