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From "Jeremy Bauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-722) persist - clear - merge scenario doesn't work
Date Thu, 18 Sep 2008 17:42:44 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632307#action_12632307
] 

Jeremy Bauer commented on OPENJPA-722:
--------------------------------------

I also got the new and update to work, but ran into the delete problem.  :-)  After one/both
of us gets the delete working, let's compare code and post a common solution and jUnits. 
I have a few additional tests in the works which use cascade relationships and explicit detachment.
 I'll post them when they are ready so you can try with your version of the fix.

> persist - clear - merge scenario doesn't work
> ---------------------------------------------
>
>                 Key: OPENJPA-722
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-722
>             Project: OpenJPA
>          Issue Type: Sub-task
>          Components: kernel
>    Affects Versions: 1.0.3, 1.1.0, 1.2.0
>            Reporter: Xiaoqin Feng
>            Assignee: Jeremy Bauer
>         Attachments: TestEntityManagerClear-V2.java, TestEntityManagerClear.java
>
>
> EntityManager.clear() now don't  flush new object but only detach it.
> But DetachManager still flush dirty object and assume detached objects are in clean state.
> When the "new" object is merged back and transaction commit,  because the object state
lost its original state PNEW, it will not be added to insert list  and not flushed to DB.
> According to the EntityManager.clear() API,  changes made to entities that have not been
flushed to the database will not be persisted.  When they merges back to persistent context,
they all should kept there original state.
> I added the following test to org.apache.openjpa.persistence.simple.TestEntityManagerClear.
>     public void testClearMerge() {
>         // Create EntityManager and Start a transaction (1)
>         begin();
>         // Insert a new object then clear persistent context
>         AllFieldTypes testObject1 = new AllFieldTypes();
>         testObject1.setStringField("my test object1");
>         persist(testObject1);
>         //Object1 is not flushed to DB but only detached by clear().
>         em.clear();
>         em.merge(testObject1);
>         //expect the PCState is same as before detached, 
>         //so it is PNew instead of PCLEAN and is add to insert list.
>         commit();
>         
>         //Start a new transaction
>         begin();
>         
>         // Attempt retrieve of Object1 from previous PC (should exist)
>         assertEquals(1, query("select x from AllFieldTypes x "
>             + "where x.stringField = 'my test object1'").
>                 getResultList().size());
>         
>         // Rollback the transaction and close everything
>         rollback();
>     }

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