我怎样才能简化这个查询,只运行一次。我当前的代码:
int year = 2014;
Query q = entityManager.createQuery("SELECT SUM(s.revenue),SUM(s.mediaSpending),SUM(s.grossProfit) FROM Sale s WHERE YEAR(s.date) = :year AND QUARTER(s.date) = :quarter");
q.setParameter("year", year);
q.setParameter("quarter", 1);
Object[] q1 = (Object[]) q.getSingleResult();
q.setParameter("quarter", 2);
Object[] q2 = (Object[]) q.getSingleResult();
q.setParameter("quarter", 3);
Object[] q3 = (Object[]) q.getSingleResult();
q.setParameter("quarter", 4);
Object[] q4 = (Object[]) q.getSingleResult();
我可以以某种方式一次查询所有 4 个 qartal 的列表吗?像这样的东西:
Query q = entityManager.createQuery("SELECT SUM(s.revenue),SUM(s.mediaSpending),SUM(s.grossProfit) FROM Sale s WHERE YEAR(s.date) = :year AND QUARTER(s.date) = ???(1-4)");
List<Object[]> q1 = q.getResultList();
编辑:结果应该是 4 个 Object 的列表:
List{Q1Statistic, Q2Statistic, Q3Statistic, Q4Statistic}