@Test
public void shouldClearSetAndThenMergeACustomer() throws Exception {
Customer03 customer = new Customer03("Antony", "Balla", "*****@*****.**");
// Persist the object
tx.begin();
em.persist(customer);
tx.commit();
assertTrue(em.contains(customer));
em.clear();
assertFalse(em.contains(customer));
tx.begin();
customer = em.merge(customer);
customer.setFirstName("William");
tx.commit();
em.clear();
assertFalse(em.contains(customer));
customer = em.find(Customer03.class, customer.getId());
assertEquals(customer.getFirstName(), "William");
assertTrue(em.contains(customer));
}
@Test // Listing 4-14
public void shouldPersistACustomerAndThenRefreshIt() throws Exception {
Customer03 customer = new Customer03("Antony", "Balla", "*****@*****.**");
Address03 address = new Address03("Ritherdon Rd", "London", "8QE", "UK");
customer.setAddress(address);
// Persist the object
tx.begin();
em.persist(customer);
em.persist(address);
tx.commit();
assertNotNull(customer.getId());
assertNotNull(address.getId());
customer = em.find(Customer03.class, customer.getId());
assertNotNull(customer);
assertEquals(customer.getFirstName(), "Antony");
customer.setFirstName("New first name");
assertEquals(customer.getFirstName(), "New first name");
em.refresh(customer);
assertEquals(customer.getFirstName(), "Antony");
}
@Test // Listing 4-18
public void shouldUpdateACustomer() throws Exception {
Customer03 customer = new Customer03("Antony", "Balla", "*****@*****.**");
// Persist the object
tx.begin();
em.persist(customer);
assertNotNull(customer.getId());
assertEquals(customer.getFirstName(), "Antony");
customer.setFirstName("Williman");
assertEquals(customer.getFirstName(), "Williman");
tx.commit();
}