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

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


        assertEquals(1, result);


        user = em.find(CompUser.class, userid1);
        em.refresh(user);
        assertNotNull(user);
        assertEquals("", user.getName());


        endTx(em);
        endEm(em);

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


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


        assertEquals(2, user.getAge());


        //-------------------------MOD Tested

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    em.persist( race );
    em.flush();
    em.clear();


    try {
      em.refresh( race );
      fail("Refresh should fail on a non managed entity");
    }
    catch( IllegalArgumentException e) {
      //success
    }

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    em.clear();
    book.name = "Le prince";
    book = em.merge( book );


    em.refresh( book );
    assertEquals( 0, stats.getEntityUpdateCount() );
    em.getTransaction().begin();
    em.flush();
    em.getTransaction().commit();
    assertEquals( 0, stats.getEntityUpdateCount() );

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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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