在JPA中按"CASE列"排序

Question

我想通过案例陈述订购,是否可能？我该怎么做？

SELECT new com.systemname.to.UserDataHolder(u.userId, 
CASE  WHEN (u.place.cityId = :cityId) THEN 1  WHEN (u.place.stateId = :stateId) THEN 2  ELSE 3 END)  
FROM User u 
ORDER BY u.userId DESC 

Answer 1

您使用的JPA提供商是什么？

尝试,

SELECT u.userId, 
(CASE  
    WHEN (u.place.cityId = :cityId) THEN 1
    WHEN (u.place.stateId = :stateId) THEN 2
    ELSE 3 END) as myNum
FROM User u 
ORDER BY u.userId, myNum DESC

要么,

SELECT new com.systemname.to.UserDataHolder(u.userId, 
CASE  
    WHEN (u.place.cityId = :cityId) THEN 1
    WHEN (u.place.stateId = :stateId) THEN 2
    ELSE 3 END)
FROM User u 
ORDER BY u.userId, CASE  
    WHEN (u.place.cityId = :cityId) THEN 1
    WHEN (u.place.stateId = :stateId) THEN 2
    ELSE 3 END DESC