DQL - 加入关系的属性

Question

我的问题与此类似，但有所不同。 Can you join on a subquery with Doctrine 2 DQL?

无论如何，我都想获得所有的rooms，然后加入属于在给定日期存在的booking 的任何occupants。

例如（一个普通的 mysql 结果集 - 教义会返回对象）：

Room ID   | Occupant ID | Booking ID | Booking Start | Booking End
1         | 1           | 1          | Before today  | After today
1         | 2           | 1          | Before today  | After today
2         | NULL        | NULL       | NULL          | NULL

这是我正在尝试的：

SELECT r, a, b
FROM MyBundle:Room r
LEFT JOIN r.occupants a
WITH a.booking is not null
LEFT JOIN a.booking b
WITH b.enrolmentStart <= :date
AND b.enrolmentEnd >= :date
AND b.status = 1
ORDER BY r.number ASC

不幸的是，这会获取所有房间，以及曾经住过那个房间的所有人，但只有在给定日期存在的预订。

另一方面，如果我更改为以下内容， 我只得到在给定日期有预订的房间。

LEFT JOIN r.occupants a
WITH a.booking is not null
JOIN a.booking b

如果我尝试以下操作，Doctrine 说它没想到在 'a' 之后有一个点。

LEFT JOIN r.occupants a
WITH a.booking.enrolmentStart <= :date
AND a.booking.enrolmentEnd >= :date
AND a.booking.status = 1
LEFT JOIN a.booking b

最后，如果我尝试以下操作，教义对订单不满意。

LEFT JOIN r.occupants a
WITH b.enrolmentStart <= :date
AND b.enrolmentEnd >= :date
AND b.status = 1
LEFT JOIN a.booking b

有什么想法吗？

Answer 1

我认为你可以只使用左连接来实现这个查询：

SELECT 
    r.number, o.id_occupant, b.id_booking, b.enrolmentStart, b.enrolmentEnd
FROM 
    MyBundle:Room r
    LEFT JOIN r.occupants o
    LEFT JOIN o.booking b
    AND b.status = 1
    AND b.enrolmentEnd >= :date
    AND b.enrolmentStart <= :date
ORDER BY r.number ASC

看看这个equivalent sql ^{(SQL Fiddle)}查询。

调试的sql：

select r.number, ref.id_occupant, ref.id_booking
from rooms r
LEFT JOIN (select * from rooms r2
left join occupants o on o.room = r2.id_room
left join booking b on b.id_booking = o.booking
where b.status = 1
and b.enrolmentEnd >= '2015/03/09'
and b.enrolmentStart <= '2015/03/10') as ref on r.id_room = ref.id_room