@Test
public void testQuotientAndMultiply() {
EntityManager em = getOrCreateEntityManager();
em.getTransaction().begin();
CriteriaQuery<Number> criteria = builder.createQuery(Number.class);
criteria.from(Product.class);
criteria.select(
builder.quot(
builder.prod(
builder.literal(BigDecimal.valueOf(10.0)),
builder.literal(BigDecimal.valueOf(5.0))),
BigDecimal.valueOf(2.0)));
Number result = em.createQuery(criteria).getSingleResult();
assertEquals(25.0d, result.doubleValue(), 0.1d);
criteria.select(
builder.prod(
builder.quot(
builder.literal(BigDecimal.valueOf(10.0)),
builder.literal(BigDecimal.valueOf(5.0))),
BigDecimal.valueOf(2.0)));
result = em.createQuery(criteria).getSingleResult();
assertEquals(4.0d, result.doubleValue(), 0.1d);
em.getTransaction().commit();
em.close();
}
/** This test provides a demonstration of using a math formual within the where clause. */
@Test
public void testFormulas() {
log.info("*** testFormulas() ***");
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Number> qdef = cb.createQuery(Number.class);
// select count(s) from Sale s
// where (s.amount * :tax) > :amount"
Root<Sale> s = qdef.from(Sale.class);
qdef.select(cb.count(s))
.where(
cb.greaterThan(
cb.prod(s.<BigDecimal>get("amount"), cb.parameter(BigDecimal.class, "tax")),
new BigDecimal(10.0)));
TypedQuery<Number> query = em.createQuery(qdef);
// keep raising taxes until somebody pays $10.00 in tax
double tax = 0.05;
for (;
query.setParameter("tax", new BigDecimal(tax)).getSingleResult().intValue() == 0;
tax += 0.01) {
log.debug("tax=" + NumberFormat.getPercentInstance().format(tax));
}
log.info("raise taxes to: " + NumberFormat.getPercentInstance().format(tax));
assertEquals("unexpected level for tax:" + tax, 0.07, tax, .01);
}
