Doctrine查询语言中的子查询

Question

我有一个SQL查询，我试图将其转换为DQL。看起来像DQL不喜欢在FROM子句中使用子查询。你能指导我的方向吗？

SQL：

select count(x.remote_addr), ipc.country 
from 
(
select distinct(remote_addr) from update_feature_requests ufr 
where ufr.request_datetime BETWEEN '2015-05-14' AND '2015-05-15' 
) 
as x 
join ip_geolocation_cache ipc ON ipc.ip_address = x.remote_addr 
group by ipc.country; 

DQL：

$dql = "select 
      count(x.remoteAddr), ipc.country 
      from 
      (
       select distinct(remoteAddr) from " . UpdateFeatureRequest::class . " ufr 
       where ufr.requestDatetime BETWEEN '2015-05-14' AND '2015-05-15' 
      ) 
      as x 
      join " . IpGeolocationCache::class . " ipc ON ipc.ipAddress = x.remoteAddr 
      group by ipc.country"; 

Doctrine \ ORM \ Query \ QueryException HELP [Semantical Error] line 0, col 82 near '(': Error: Class '(' is not defined.

Answer 1

学说确实支持子查询只在有限的方式（如柱，其中，存在等）和可惜的派生表（子查询从）不是其中之一。你必须重新构造完整的查询才能进入dql。

等效的查询可能是沿（SQL版）的东西：

select count(distinct ufr.remote_addr), ipc.country 
from update_feature_requests ufr 
join ip_geolocation_cache ipc ON ipc.ip_address = ufr.remote_addr 
where ufr.request_datetime BETWEEN '2015-05-14' AND '2015-05-15' 
group by ipc.country; 

（应该算每counry这是我看了你的原始查询的唯一地址）

另一种可能性是使用native query