hibernate 分组查询
DetachedCriteria criteria = DetachedCriteria.forClass(DreamDownClient.class); /*实体类*/
/*参数1 查询的字段名，参数2 分组的字段，参数3 查询结果返回的列名，参数3，返回结果的字段类型*/
criteria.setProjection( Projections.sqlGroupProjection("ditch,count(*) as c", "ditch", new String[]{ "ditch" ,
"c"}, new Type[]{ IntegerType.INSTANCE , IntegerType.INSTANCE } ) ) ;
criteria.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP) ;
System.out.println( dreamDownClientServer.query( criteria ) ) ;
补充：软件开发 , Java ,
