在hql中左加入第一個比賽

Question

select 
    schedulingpool.id,
    schedulingpool.allocationVersion,
    schedulingpool.tx.statusId,
    schedulingpool.name,
    schedulingpool.description,
    schedulingpool.schedulingPoolAddresses.name,
    schedulingpool.schedulingPoolAddresses.zip,
    schedulingpool.schedulingPoolAddresses.city,
    schedulingpool.schedulingPoolAddresses.countryId,
    schedulingpool.schedulingPoolAddresses.street,
    schedulingpool.statusId,
    schedulingpool.tx.name,
    schedulingpool.note1,
    schedulingpool.note2
from 
    com.xx.module.mm.jpa.SchedulingPool as schedulingpool 
left join schedulingpool.tx
left join schedulingpool.schedulingPoolAddresses
where schedulingpool.clientId = :clientId
     order by schedulingpool.id DESC

javax.servlet.ServletException：java.lang.IllegalArgumentException：org.hibernate.QueryException：非法嘗試取消引用元素屬性為[name]的集合[scheduling0_.id.schedulingPoolAddresses]

一個調度池可以有多個地址，當我執行該語句時，我得到了異常。 有沒有辦法獲得匹配的第一個地址並加入它以防止出現此異常？

Answer 1

您需要使用別名

select 
    schedulingpool.id,
    schedulingpool.allocationVersion,
    tx.statusId,
    schedulingpool.name,
    schedulingpool.description,
    schedulingPoolAddresses.name,
    schedulingPoolAddresses.zip,
    schedulingPoolAddresses.city,
    schedulingPoolAddresses.countryId,
    schedulingPoolAddresses.street,
    schedulingpool.statusId,
    tx.name,
    schedulingpool.note1,
    schedulingpool.note2
from 
    com.xx.module.mm.jpa.SchedulingPool as schedulingpool 
left join schedulingpool.tx tx
left join schedulingpool.schedulingPoolAddresses schedulingPoolAddresses
where schedulingpool.clientId = :clientId
     order by schedulingpool.id DESC

你需要有關聯的SchedulingPool類的schedulingPoolAddresses和tx 。