使用hibernate计算group in中的其他字段

我希望通过hibernate返回组中其他字段的行数 ，并且我的实体类中没有任何字段表示count。 例如，我有一个Payment实体类：

class Payment { private Long id; private String totalCode; private String activityCode; private Long amount; // other fields and setter/getters } 

sql查询：

 select count(*), sum(p.amount), p.total_code, p.activity_code from tb_payment p group by p.total_code,p.activity_code 

和我的hibernate标准：

 Session session = getCurrentSession(); ProjectionList projectionList = Projections.projectionList(); projectionList.add(Projections.groupProperty("totalCode")) .add(Projections.groupProperty("activityCode")) .add(Projections.sum("amount")) .add(Projections.count("id")); Criteria criteria = session.createCriteria(Payment.class); criteria.setProjection(projectionList); List payments = criteria.list(); 

正如我所说，我的问题是我不知道在哪里/如何访问count的值（来自criteria.list（））!?

Answer 1

我认为这是您的代码的正确版本：

 Session session = getCurrentSession(); ProjectionList projectionList = Projections.projectionList(); projectionList.add(Projections.groupProperty("totalCode")) .add(Projections.groupProperty("activityCode")) .add(Projections.sum("amount")) .add(Projections.rowCount()); Criteria criteria = session.createCriteria(Payment.class); criteria.setProjection(projectionList); List payments = criteria.list(); for (Object[] payment : payments) { System.out.println("totalCode: " + payment[0]); System.out.println("activityCode: " + payment[1]); System.out.println("amountSum: " + payment[2]); System.out.println("rowCount: " + payment[3]); }