在幂等情况下通过服务更新实体的最佳方式？

Question

假设我有实体：

class UserEntity
{
    /**
     * @var integer
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;


    /**
     * @var string
     * @ORM\Column(type="string")
     */
    private $name;

    /**
     * @var string
     * @ORM\Column(type="string")
     */
    private $email;

// and contruct, getters and setters..

}

并在各自的服务中：

class UserService extends BaseService
{
    public function update($id, $data)
    {
        try {
            $user= $this->fetch($id);

            if (! $user instanceof UserEntity) {
                // throw respective exception;
            }

            $user->setName($data['name']);
            $user->setEmail($data['email']);

            $this->entityManager->flush($user);

            return $user;
        } catch (Exception $e) {
            throw $e;
        } 
    }
}

如果有这样的用户：

{
    id: 1,
    name: jhon,
    email: jhon@domain.com
}

提供给服务的数据是：

$id = 1;
$data = [
     'name' => jhon,
     'email => jhon@domain,com
]

那么，在这些情况下，避免对数据库进行不必要的查询的最佳方法是什么？因为没有必要调用 flush 方法。还是 Doctrine 内部负责不做查询？

Answer 1

根据 current docs:

The flush operation applies to a managed entity with the following semantics:

The entity itself is synchronized to the database using a SQL UPDATE statement, only if at least one persistent field has changed.

No SQL updates are executed if the entity did not change.

当实体成为托管时（根据它们的 ORMInvalidArgumentExceptions 之一）：

An entity is managed if its fetched from the database or registered as new through EntityManager#persist

是的，Doctrine 会为您做决定。

在幂等情况下通过服务更新实体的最佳方式？

the best way of update entity through a service in idempotent case?

php

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doctrine-orm