@Test
public void testDiff() {
EntityManager em = getOrCreateEntityManager();
em.getTransaction().begin();
CriteriaQuery<Integer> criteria = builder.createQuery(Integer.class);
criteria.from(Product.class);
criteria.select(builder.diff(builder.literal(5), builder.literal(2)));
Integer result = em.createQuery(criteria).getSingleResult();
assertEquals(Integer.valueOf(3), result);
em.getTransaction().commit();
em.close();
}
@Test
public void diff() {
EntityManager entityManager = factory.createEntityManager();
CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<Employee> query = builder.createQuery(Employee.class);
Root<Employee> root = query.from(Employee.class);
query.select(root);
query.where(builder.lessThan(builder.diff(root.get(Employee_.age), 10), 10));
List<Employee> employees = entityManager.createQuery(query).getResultList();
assertAndShow(4, employees);
}
@Test
public void testDiffWithQuotient() {
EntityManager em = getOrCreateEntityManager();
em.getTransaction().begin();
CriteriaQuery<Number> criteria = builder.createQuery(Number.class);
criteria.from(Product.class);
criteria.select(
builder.quot(
builder.diff(
builder.literal(BigDecimal.valueOf(2.0)), builder.literal(BigDecimal.valueOf(1.0))),
BigDecimal.valueOf(2.0)));
Number result = em.createQuery(criteria).getSingleResult();
assertEquals(0.5d, result.doubleValue(), 0.1d);
em.getTransaction().commit();
em.close();
}