使用 Hibernate 的 Criteria,我想执行相当于:
select distinct uspscity, state from citycomplete where USPSCITY = 'HOUSTON'
我认为执行以下操作会产生我想要的结果:
ProjectionList projList = new ProjectionList();
projList.add(Projections.distinct(Projections.property("id.state")));
projList.add(Projections.distinct(Projections.property("id.uspsCity")));
criteria.setProjection(projList);
但是,这实际上执行的是类似的操作:
select distinct uspscity, distinct state from citycomplete where USPSCITY = 'HOUSTON'
这显然会引发错误。
除了不使用 Criteria 之外,还有其他解决方案吗?
谢谢,
布兰登
ProjectionList projList = Projections.projectionList();
projList.add(Projections.property("id.state"));
projList.add(Projections.property("id.uspsCity"));
criteria.setProjection(Projections.distinct(projList));