orphanRemoval 会绕过 onDelete 吗？

Question

假设我们有两个实体（Profile 和 Address）。一个配置文件可以有多个地址。在这种情况下，我们有：

Profile:
    ...
    fields:
        ...
    oneToMany:
        addresses:
            targetEntity: Address
            mappedBy: profile
            orphanRemoval: true
            
Address:
    ...
    fields:
        ...
    manyToOne:
        profile:
            targetEntity: Profile
            inversedBy: addresses
            joinColumn:
                name: profile_id
                referencedColumnName: id
                onDelete: cascade

现在，如果我删除包含多个地址的配置文件：

$em->remove($profile);

如何删除地址？

Doctrine 是获取与此配置文件相关的所有地址然后删除它们，还是仅删除配置文件并让数据库处理地址？

我找到了一些关于 Hibernate 的答案，但没有找到关于 Doctrine.

的答案

编辑：添加来自 Doctrine book

的三个注释

1.If an association is marked as CASCADE=REMOVE Doctrine 2 will fetch this association. If its a Single association it will pass this entity to EntityManager#remove(). If the association is a collection, Doctrine will loop over all its elements and pass them toEntityManager#remove(). In both cases the cascade remove semantics are applied recursively. For large object graphs this removal strategy can be very costly.

2.Using a DQL DELETE statement allows you to delete multiple entities of a type with a single command and without hydrating these entities. This can be very efficient to delete large object graphs from the database.

3.Using foreign key semantics onDelete="CASCADE" can force the database to remove all associated objects internally. This strategy is a bit tricky to get right but can be very powerful and fast. You should be aware however that using strategy 1 (CASCADE=REMOVE) completely by-passes any foreign key onDelete=CASCADE option, because Doctrine will fetch and remove all associated entities explicitly nevertheless.

Answer 1

orphan removal in the Doctrine manual. There is also another question 中有一节澄清 onDelete: cascade。希望这两个链接能帮助您进一步理解该主题。

此外，确保在 $em->remove($profile); 之后调用 $em->flush(); 操作将本地工作单元同步到数据库。

Answer 2

我做一个测试：

我先获取Profile（只有profile没有join）然后传给$em->remove($profile)，然后doctrine 运行另一个查询，它获取与 Profile （一个查询）相关的所有 Address，然后是 doctrine 运行删除查询与 Profile 相关的每个地址 ，最后删除 Profile.

所以，我可以说 orphanRemoval 是另一种类型的级联，正如学说所说：

orphanRemoval: There is another concept of cascading that is relevant only when removing entities from collections

和orphanRemoval绕过onDelete。

orphanRemoval 会绕过 onDelete 吗？

Does orphanRemoval bypass onDelete?

php

doctrine

symfony

doctrine-orm