问题描述

我有一个实体Log(表log)，成员resourceType 和resourceId(列>resource_log 和 resource_id).resourceType 可以例如Order(用于订单操作，例如状态更改)或 Whatever(用于 Whatever 相关操作).Log 和资源"实体/表之间没有关系(无论是在 Doctrine 中，还是在数据库中).

I have an entity Log (table log) with members resourceType and resourceId (with columns resource_log and resource_id). The resourceType can e.g. Order (for actions on orders, e.g. status changes ) or Whatever (for Whatever related actions). There is no relationships (neither in Doctrine, nor in the database) between the Log and the "resource" entities/tables.

现在我只想选择与 Order 相关的 Log 和 myOrderProperty = "someValue".这意味着:

Now I want to select only the Logs, that are related to Orders with myOrderProperty = "someValue". That means:

SELECT
    *
FROM
    `log`
JOIN
    `order` ON `order`.`id` = `log`.`resource_id` AND `log`.`resource_type` = 'order'
WHERE
    `order`.`my_order_property` LIKE '%my_order_property_value%'

但是代码

$queryBuilder = $this->entityManager->createQueryBuilder();
$queryBuilder->select('l')->from(Log::class, 'l');
$queryBuilder->join('l.order', 'o');
...
$queryBuilder
    ->where('o.myOrderProperty = :myOrderProperty')
    ->setParameter('myOrderProperty', $myOrderProperty);

不起作用，因为实体 Log 与 Order 没有任何关系(尽管它有一个属性 order):

doesn't work, since the entity Log doesn't have any relationship with the Order (though it has a property order):

[Semantical Error] line 0, col 102 near 'o WHERE o.myOrderProperty': Error: Class MyNamespaceLog has no association named order

如何在两个实体之间没有定义关系的情况下JOIN?

_{我知道，我可以使用 继承.但从语义上讲，它不是继承的情况.那么有没有其他办法解决这个问题?}

_{I know, I could use inheritance. But semantically it's not an inheritance case. So is there another way for solving the problem?}

推荐答案

没有关系的JOIN可以这样实现:

The JOIN without relationship can be implemented like this:

$queryBuilder = $this->entityManager->createQueryBuilder();
$queryBuilder->select('l')->from(Log::class, 'l');
$queryBuilder->join(
    Order::class,
    'o',
    DoctrineORMQueryExprJoin::WITH,
    'o.id = l.resourceId'
);
...
$queryBuilder
    ->where('o.myOrderProperty = :myOrderProperty')
    ->setParameter('myOrderProperty', $myOrderProperty);

唯一的问题是，加入的实体没有添加到主实体中，因此 $myLog->getOrder(...) 返回 null.

The only problem is, that the joined entities are not added to the main entity, so that $myLog->getOrder(...) returns null.

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