Question

我希望能够检索一个实体的现有版本,以便我能够将其与最新版本进行比较。 E.g. 编辑文件,我想知道,自在非行,价值是否发生了变化。

    $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"

是否有任何人知道我如何能够绕过这一ach子?

Answer 1

它是一种正常的行为。

理论在实体管理中记载了被检索的实体的参考资料,这样它就可以在不进行另一盘问的情况下归还一个实体。

你们可以做这样的事情:

$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);

但意识到,由于邮政实体的美元贬值,如果你想再次坚持,你必须使用——和——合并——方法。

Answer 2

You can also use the refresh method, which refreshes the persistent state of an entity from the database, overriding any local changes that have not yet been persisted. Something like:

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

$entityManager->refresh($post);

员额现在包含数据库的最后版本。

友情链接