如何在 Doctrine 2.0 中编写 UNION [英] How to write UNION in Doctrine 2.0
本文介绍了如何在 Doctrine 2.0 中编写 UNION的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在 Doctrine 2.0 中编写此 SQL 查询(并获取结果)?
How to write this SQL query in Doctrine 2.0 (and fetch results)?
(SELECT 'group' AS type,
CONCAT(u.firstname, " ", u.surname) as fullname,
g.name AS subject,
user_id,
who_id,
group_id AS subject_id,
created
FROM group_notification
JOIN users u ON(who_id = u.id)
JOIN groups g ON(group_id = g.id)
)
UNION
(SELECT 'event' AS type,
CONCAT(u.firstname, " ", u.surname) as fullname,
e.name AS subject,
user_id,
who_id,
event_id AS subject_id,
created
FROM event_notification
JOIN users u ON(who_id = u.id)
JOIN events e ON(event_id = e.id)
)
ORDER BY created
推荐答案
好吧,我找到了也许最好的解决方案:
Well, I found maybe the best solution:
/**
* @Entity
* @InheritanceType("JOINED")
* @DiscriminatorColumn(name="discr", type="string")
* @DiscriminatorMap({"group" = "NotificationGroup", "event" = "NotificationEvent"})
*/
class Notification {
// ...
}
然后是扩展 Notification 的两个类(NotificationGroup 和 NotificationEvent):
And then two classes (NotificationGroup and NotificationEvent) extending Notification:
/**
* @Entity
*/
class NotificationGroup extends Notification {
//...
}
/**
* @Entity
*/
class NotificationEvent extends Notification {
//...
}
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