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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     */
        EntityManager em = entityManagerFactory.createEntityManager();
        em.getTransaction().begin();
    Customer c = em.find(Customer.class, customerID);
    em.lock(c, LockModeType.WRITE);
    em.refresh(c);
    // TODO: lowp: test and set for update performance?
    c.setFirstName(firstName);
    c.setLastName(lastName);
    c.setAddr1(addr1);
    c.setAddr2(addr2);

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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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            if (!(dict instanceof InformixDictionary)) {
                props.put("javax.persistence.lock.timeout", 5000);
            }
            em.getTransaction().begin();
            getLog().trace("Main: refresh with force increment");
            em.refresh(ve, LockModeType.PESSIMISTIC_FORCE_INCREMENT, props);  
            getLog().trace("Main: commit");
            em.getTransaction().commit();
            getLog().trace("Main: done commit");
            fail("Expected LockTimeoutException");
        } catch (Throwable t) {

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