我的查询是否成功？ [英] Was my query successful?

问题描述

  User :: destroy（Input :: get（'数据'））; 
  

我需要测试上述操作是否成功，我该怎么办？

我尝试过：

  $ deleted = User ::破坏（输入::获得（ '数据'））; 
 
 if（is_null（$ deleted））{
 App :: abort（404）; 
} 
  

但无济于事。

这里推荐的做法是什么？

解决方案

如果你看看 Illuminate\Database\Eloquent\Model s destroy（） 方法，你可以看到它返回删除的记录数。

所以最优雅的方式可能是： / p>

  $ deleted = User :: destroy（Input :: get（'data'））; 
 
 if（$ deleted === 0）{
 App :: abort（404）; 
} 
  

然而，如果你不在乎严格的比较，你可以去：

  if（！User :: destroy（Input :: get（'data'））
 {
 App :: abort（404）; 
} 
  

这是因为0评估为false当不严格比较时，这也是对方法的评论说（1058-1060）：

我们将在这里初始化一个计数我们将返回这个操作的删除总数
，然后开发人员可以将这个数字作为一个布尔值
类型的值来检索，或者获取这个记录数据的总计数，等等。

我建议您坚持强力比较，因为返回类型更清晰，但您可以随意选择任何您想要的。

I perform a variety of actions on my model, eg.

User::destroy(Input::get('data'));

I need to test whether the above operation was sucessful or not, how would I go about doing it?

I've tried:

$deleted = User::destroy(Input::get('data'));

if (is_null($deleted) ) {
    App::abort(404);
}

But to no avail.

What is recommended practice here?

解决方案

If you take a look at the Illuminate\Database\Eloquent\Models destroy() method you can see that it returns the number of records deleted.

So the most elegant way to go through it would probably be:

$deleted = User::destroy(Input::get('data'));

if ( $deleted === 0 ) {
    App::abort(404);
}

However if you don't care about strict comparison you could just go with:

if( ! User::destroy(Input::get('data') )
{
    App::abort(404);   
}

That works because 0 evaluates to false when not comparing strictly. That's also what the comments on the method say (1058-1060):

We'll initialize a count here so we will return the total number of deletes for the operation. The developers can then check this number as a boolean type value or get this total count of records deleted for logging, etc.

I would suggest you stick with strong comparison because the return type is just clearer, but you're free to choose whatever you want.

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