Question

鉴于此分离查询：

DetachedCriteria notExistInCriteria = DetachedCriteria.forClass(ReportTelephonyEvent.class, "r2");
notExistInCriteria.add(Restrictions.eq("child", child));
notExistInCriteria.add(Restrictions.eqProperty("countryCode", "r1.countryCode"));
notExistInCriteria.add(Restrictions.eqProperty("phonenumber", "r1.phonenumber"));
notExistInCriteria.add(Restrictions.or(Restrictions.lt("startTime", start), Restrictions.gt("startTime", end)));
notExistInCriteria.setProjection(Projections.property("phonenumber"));

我现在设置了Projection“phonenumber”，但是我想将它设置为1，这样输出查询将是这样的'：

SELECT 1 FROM bpr_report_telephony_event .............

如何设置Projection以使Hibernate在选择列中只有“1”？

Answer 1

用Projections.sqlProjection（“1”）替换Projections.property（“phonenumber”）应该这样做。

Answer 2

为了得到“1”作为投影的结果，你可以这样做：

notExistInCriteria.setProjection(Projections.sqlProjection("1", new String[]{}, new Type[] { IntegerType.INSTANCE })

Hibernate Projection设置列为1

2 个答案: