Symfony2教义合并 [英] Symfony2 Doctrine merge

问题描述

我正在学习 http：//docs.doctrine -project.org/en/latest/reference/working-with-associations.html ，但我不知道什么是级联合并。我在其他地方见过

I am studying http://docs.doctrine-project.org/en/latest/reference/working-with-associations.html but I cannot figure out what cascade merge does. I have seen elsewhere that

$new_object = $em->merge($object); 

基于 $ object 。是否正确？

推荐答案

$ em-> merge（）被用来拿一个已经从实体经理的背景中取出并重新附加它的实体。

$em->merge() is used to take an Entity which has been taken out of the context of the entity manager and 'reattach it'.

• 如果实体从未被管理，则合并相当于持续。


• 如果实体是分离或序列化（可能放入缓存），然后合并或多或少地查找数据存储中的实体的ID，然后从该点起始跟踪实体的任何更改。

级联合并将此行为扩展到要合并的关联实体。这意味着更改级联到关联，而不仅仅是被合并的实体。

Cascading a merge extends this behavior to associated entities of the one you are merging. This means that changes are cascaded to the associations and not just the entity being merged.

这篇关于Symfony2教义合并的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！