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Question

我有以下查詢：

List results = getSession() 
       .createCriteria(AppointmentSlot.class) 
       .setProjection(
         Projections.projectionList() 
           .add(Projections.min("startTime")) 
           .add(Projections.max("endTime")) 
           .add(Projections.groupProperty("clinicInfo")) 
           .add(Projections.groupProperty("staffInfo")) 
           .add(Projections.groupProperty("status")) 
           .add(Projections.groupProperty("dayId"))) 
       .list(); 

我想選擇哪個計算min("startTime")和max("endTime")的區別附加屬性。對於兩列startTime

UPDATE

採樣值的數據庫和endTime

1. 08:00:00，8點15分00秒
2. 8點15分00秒，09:00 ：00
3. 09:00:00，09:15:00 ...

這怎麼可能使用Hibernate？

Answer 1

嘗試sql投影。類似於

List results = getSession() 
       .createCriteria(AppointmentSlot.class, "apps") 
       .setProjection(
         Projections.projectionList() 
           .add(Projections.min("startTime").as("minStart")) 
           .add(Projections.max("endTime").as("maxTime")) 
           .add(Projections.groupProperty("clinicInfo")) 
           .add(Projections.groupProperty("staffInfo")) 
           .add(Projections.groupProperty("status")) 
           .add(Projections.groupProperty("dayId"))) 
           .add(Projections.sqlProjection("(apps.minStart- apps.maxTime) as duration", new String[]{"duration"}, new org.hibernate.type.DateType[]{new org.hibernate.type.DateType()}),"duration") 
       .list();