如何停止教条2缓解结果在Symfony 2？ [英] How to stop Doctrine 2 from caching a result in Symfony 2?

问题描述

我希望能够检索一个实体的现有版本，以便将其与最新版本进行比较。例如。编辑一个文件，我想知道这个值是否在数据库中改变了。

  $ entityManager = $ this-> ;获得（ '教义'） - > getEntityManager（）; 
 $ postManager = $ this-> get（'synth_knowledge_share.manager'）; 
 
 $ repository = $ entityManager-> getRepository（'KnowledgeShareBundle：Post'）; 
 $ post = $ repository-> findOneById（1）; 
 
 var_dump（$ post-> getTitle（））; //这将输出我的标题
 $ post-> setTitle（Unpersisted new title）; 
 
 $ existingPost = $ repository-> findOneById（1）; //检索旧实体
 
 var_dump（$ existingPost-> getTitle（））; //这将输出Unpersisted new title而不是预期的我的标题
  

有谁知道如何解决这个缓存？

解决方案

这是一个正常的行为。

/ p>

  $ entityManager = $ this-> get（'doctrine'） - > getEntityManager（）; 
 $ repository = $ entityManager-> getRepository（'KnowledgeShareBundle：Post'）; 
 $ post = $ repository-> find（1）; 
 
 $ entityManager-> detach（$ post）; 
 
 //因为先前加载的帖子被分离，它加载一个新的
 $ existingPost = $ repository-> find（1）; 
  

但是请注意，由于$ post实体已分离，您必须使用 - > merge ）方法，如果你想再次坚持。

I want to be able to retrieve the existing version of an entity so I can compare it with the latest version. E.g. Editing a file, I want to know if the value has changed since being in the DB.

    $entityManager = $this->get('doctrine')->getEntityManager();
    $postManager = $this->get('synth_knowledge_share.manager');

    $repository = $entityManager->getRepository('KnowledgeShareBundle:Post');
    $post = $repository->findOneById(1); 

    var_dump($post->getTitle()); // This would output "My Title"
    $post->setTitle("Unpersisted new title");

    $existingPost = $repository->findOneById(1); // Retrieve the old entity

    var_dump($existingPost->getTitle()); // This would output "Unpersisted new title" instead of the expected "My Title"

Does anyone know how I can get around this caching?

解决方案

It's a normal behavior.

Doctrine stores a reference of the retrieved entities in the EntityManager so it can return an entity by it's id without performing another query.

You can do something like :

$entityManager = $this->get('doctrine')->getEntityManager();
$repository = $entityManager->getRepository('KnowledgeShareBundle:Post');
$post = $repository->find(1);

$entityManager->detach($post);

// as the previously loaded post was detached, it loads a new one
$existingPost = $repository->find(1);

But be aware of that as the $post entity was detached, you must use the ->merge() method if you want to persist it again.

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