如何在Doctrine 2中检查实体是否发生变化？ [英] How to check if entity changed in Doctrine 2?

问题描述

我需要检查持久化实体是否已更改，需要在数据库上进行更新。
我所做的（并没有工作）如下：

I need to check if a persisted entity has changed and needs to be updated on the database. What I made (and did not work) was the following:

$product = $entityManager->getRepository('Product')->find(3);
$product->setName('A different name');

var_export($entityManager->getUnitOfWork()->isScheduledForUpdate($product));

该代码总是打印 false ，我也在检查工作单位之前尝试冲洗，但没有工作。

That code prints always false, I also tried to flush before check the unit of work, but did not work.

任何人都有建议？

推荐答案

首先我检查一下，你的 setName 函数实际上是在做某事（$ this-> name = $ name ...）如果它已经在工作，那么您可以在调用flush时触发的services.yml中定义一个事件侦听器。

The first thing I'd check it that your setName function is actually doing something ($this-> name = $name...) If it's already working, then you could define an event listener on your services.yml that is triggered when you call the flush.

entity.listener:
  class: YourName\YourBundle\EventListener\EntityListener
  calls:
    - [setContainer,  ["@service_container"]]
  tags:
    - { name: doctrine.event_listener, event: onFlush }

然后定义EntityListener

Then you define the EntityListener

namespace YourName\YourBundle\EventListener;

use Doctrine\ORM\Event;
use Symfony\Component\DependencyInjection\ContainerAware;

class EntityListener extends ContainerAware
{   

    /**
     * Gets all the entities to flush
     *
     * @param Event\OnFlushEventArgs $eventArgs Event args
     */
    public function onFlush(Event\OnFlushEventArgs $eventArgs)
    {   
        $em = $eventArgs->getEntityManager();
        $uow = $em->getUnitOfWork();

        //Insertions
        foreach ($uow->getScheduledEntityInsertions() as $entity) {
            # your code here for the inserted entities
        }

        //Updates
        foreach ($uow->getScheduledEntityUpdates() as $entity) {
            # your code here for the updated entities
        }

        //Deletions
        foreach ($uow->getScheduledEntityDeletions() as $entity) {
            # your code here for the deleted entities
        }
    }

如果您需要知道哪些实体正在更改，但在之后他们会执行某些操作已经保存到数据库中，只需将实体更改为私有数组，然后定义一个从数组中获取实体的onFlush事件。

If you need to know which entities are being changed, but do something with them after they've been saved to the database, just store the entities changed in a private array, an then define a onFlush event that gets the entities from the array.

BTW，to触发此类事件，您需要在实体上添加@ ORM\HasLifecycleCallbacks。

BTW, to trigger this kind of events you need to add the @ORM\HasLifecycleCallbacks on the entity.

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