如何在 Doctrine 2 中将实体重新保存为另一行

2022-01-16 00:00:00 php doctrine doctrine-orm temporal-database

假设我有实体 $e.是否有任何通用方法将其存储为另一行，这将具有相同的实体数据但另一个主键?

Let's say I have entity $e. Is there any generic way to store it as another row, which would have the same entity data but another primary key?

为什么我需要这个:我正在实现某种 Temporal Database 架构，而不是更新我刚刚更新的行需要创建另一个.

Why I need this: I'm implementing some sort of Temporal Database schema and instead of updating the row I just need to create another one.

推荐答案

尝试克隆并将以下方法添加到您的实体中

Try cloning and add the following method to your entity

public function __clone() {
    $this->id = null;
}

您可能需要 在持久化实体之前分离实体.我现在手头没有我的开发机器来测试这个.

You may need to detach the entity before persisting it. I don't have my dev machine handy to test this right now.

$f = clone $e;
$em->detach($f);
$em->persist($f);
$em->flush();

更新

刚刚尝试使用一个简单的 SQLite 演示.你不应该做任何事情.以下对我有用，而无需添加 __clone() 方法或做任何其他不寻常的事情

Update

Just tried using a simple SQLite demo. You shouldn't need to do anything. The following worked for me without adding a __clone() method or doing anything else out of the ordinary

$new = clone $old;
$em->persist($new);
$em->flush();

刷新后，$new 实体有一个新 ID，并在数据库中保存为新行.

Once flushed, the $new entity had a new ID and was saved as a new row in the DB.

我仍然会通过 __clone() 方法使 ID 属性为空，因为从纯模型视图来看它是有意义的.

I would still null the ID property via the __clone() method as it makes sense from a pure model view.

深挖Doctrine代码，这是因为生成的代理类实现了__clone()，这行很重要

Digging into the Doctrine code, this is because the generated proxy classes implement __clone() with this important line

unset($this->_entityPersister, $this->_identifier);

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