Examples of javax.persistence.EntityManager.refresh()

javax.persistence.EntityManager.refresh()
Refresh the state of the instance from the database, overwriting changes made to the entity, if any. @param entity @throws IllegalStateException if this EntityManager has been closed @throws IllegalArgumentException if not an entityor entity is not managed @throws TransactionRequiredException if invoked on acontainer-managed entity manager of type PersistenceContextType.TRANSACTION and there is no transaction. @throws EntityNotFoundException if the entity no longerexists in the database

          .setParameter("oldname", "Original")
          .executeUpdate();
        em.getTransaction().commit();
        
        em.getTransaction().begin();
        em.refresh(pc);
        Timestamp newVersion = pc.getVersion();
        assertTrue("Expected newVersion=" + newVersion.toString() + " to be after oldVersion=" + oldVersion.toString(),
            newVersion.after(oldVersion));
    }

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          .setParameter("oldname", "Original")
          .executeUpdate();
        em.getTransaction().commit();
        
        em.getTransaction().begin();
        em.refresh(pc);
        int newVersion = pc.getVersion();
        assertEquals(newVersion, oldVersion+1);
    }

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        int result = em.createQuery(query).executeUpdate();


        assertEquals("the result is not 1", 1, result);


        user = em.find(CompUser.class, userid1);
        em.refresh(user);


        assertNotNull("the user is null", user);
        assertEquals("the users name is not AblahumSeet", "Ablahumeeth",
            user.getName());

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        result = em.createQuery(query).executeUpdate();


        assertEquals("the result is not 1", 1, result);


        user = em.find(CompUser.class, userid1);
        em.refresh(user);


        assertNotNull("the user is null", user);
        assertEquals("the users name is not Ablahumeeth", "XYZeeth",
            user.getName());
        endTx(em);

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        int result = em.createQuery(query).executeUpdate();


        assertEquals(1, result);


        user = em.find(CompUser.class, userid1);
        em.refresh(user);
        assertNotNull(user);
        // Empty strings are stored as null on Oracle so the assertion below
        // must be handled differently on that DB.  The docs indicate that
        // this may not be the case in future releases so either result is
        // allowed.

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            "e.name = Trim(e.name) WHERE " +
            "e.name='Shannon '";
        int result = em.createQuery(query).executeUpdate();


        user = em.find(CompUser.class, userid2);
        em.refresh(user);
        assertNotNull(user);
        assertEquals("Shannon", user.getName());


        endTx(em);
        endEm(em);

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            "e.name = LOWER(e.name) WHERE e.name='Ugo'";


        int result = em.createQuery(query).executeUpdate();


        user = em.find(CompUser.class, userid3);
        em.refresh(user);
        assertNotNull(user);
        assertEquals("ugo", user.getName());


        endTx(em);
        endEm(em);

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            "e.name = UPPER(e.name) WHERE e.name='Ugo'";


        int result = em.createQuery(query).executeUpdate();


        user = em.find(CompUser.class, userid3);
        em.refresh(user);
        assertNotNull(user);
        assertEquals("UGO", user.getName());


        endTx(em);
        endEm(em);

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        assertNotNull(num);
        assertEquals(1, num);


        user = em.find(CompUser.class, userid1);
        em.refresh(user);


        assertEquals(36, user.getAge());


        //----------------------ABS Tested

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        assertNotNull(num);
        assertEquals(1, num);


        user = em.find(CompUser.class, userid1);
        em.refresh(user);


        assertEquals(6, user.getAge());


        //-------------------------SQRT Tested

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