CodeIgniter和抛出异常 [英] CodeIgniter and throwing exceptions

问题描述

我最近递交了一个我在CodeIgniter建的学校项目。我不得不把它提交给我的老师，当我问我如何处理某些错误时，他告诉我在事件链中早些时候拦截异常。

I recently handed in a project for school which I built in CodeIgniter. I had to present it to my teacher and when asked how I handled certain errors, he told me to throw exceptions to intercept things a lot earlier in the chain of events.

我学会了如何抛出异常，以及如何使用 try ... catch 阻塞到uh，捕捉和处理它们，但不知何故，当我开始使用CodeIgniter，我忘了所有他们并没有真的使用例外了。

I have learnt how to throw exceptions and how to use try...catch blocks to uh, catch and handle them but somehow, when I started using CodeIgniter, I forgot all about them and didn't really use exceptions anymore.

相反，我只是手动处理我的错误，因为缺少一个更好的词：我会使用 TRUE 和 FALSE 布尔值来检查例如查询是否正确执行，我将使用返回的布尔值来处理查询结果。如果 TRUE ，我会继续做我的东西，如果 FALSE 我会'手动'信息。该项目非常依赖于AJAX，并且错误消息将以相当奇怪的方式弹出，从页面的顶部下降;不确定这是否可能，当我抛出一个异常 throw new Exception ？我知道这基本上停止代码执行时抛出异常，所以不会破坏的东西在某种程度上？

Instead, I just handled my errors 'manually', for lack of a better word: I'd use TRUEand FALSE boolean values to check if, for example, a query executed properly, and I would use the returned boolean to handle the result of the query. If TRUE, I'd go ahead and do my stuff, if FALSE I'd 'manually' throw an error message. The project was very AJAX-dependent and the error messages would pop up in quite a fancy way, dropping down from the top of the page; not sure if this is possible when I throw an exception with throw new Exception? I know that this basically stops the code from executing when the exception is thrown, so wouldn't that break things somehow?

我也似乎记得读某处抛出异常不是最好的做法，但我找不到这个来源，我不太确定如果这是情况;毕竟，我们没有学习如何在课堂上使用它们，我喜欢相信我们在那里学习最佳实践。哈哈。

I also seem to remember reading somewhere that throwing exceptions isn't the best practice ever but I can't find the source of this anymore and I'm not quite sure if this is the case; after all, we did learn how to use them in class and I like to believe we learn best practices there, haha.

如果有必要，我可以回去尝试找到那段代码，他指出我应该抛出一个异常。但是，现在，我只是想知道是否应该在我的代码中使用异常或手动处理事情。

If necessary, I could go back and try to find the piece of code where he pointed out that I should've thrown an exception. However, for now, I'm just wondering whether or not I should use exceptions in my code or handle things manually. What are the best practices regarding this?

感谢。

推荐答案

只是FYI，我不使用CodeIgniter中的异常，我在Kohana中使用他们，只是因为框架抛出它们，一切都设计为处理异常与CodeIgniter不同。使用异常是一个好的做法，只要你的所有类/框架都设计为与他们一起工作。

Just FYI, I don't use exceptions in CodeIgniter tho I'm using them a lot in Kohana, just because the framework throws them and everything is designed to work with exceptions unlike CodeIgniter. Using exceptions is a good practice providing all your classes/framework are designed to work with them.

我不想（真的，不要）想进入框架比较讨论，但我需要比较两个代码来澄清你的问题，一个从CI2和另一个从Kohana 3（它出生作为一个分支的CI与更好的面向对象的实现）。

I don't (really, DON'T) want to enter in framework comparison discussions, but I need to compare two pieces of code to clarify your question, one piece from CI2 and another from Kohana 3 (it born as a branch of CI with better object oriented implementation).

您会看到此CI2代码...

You'll see this CI2 code...

try
{
    $result = $this->db->insert('entries', $this->input->post());

    // This is not useful.
    if ( ! $result)
    {
        throw new Exception();
    }
}
catch (Exception $e)
{
    // Do something
}

这不是很有用。与这个Kohana 3代码比较：

It's not very useful. Compare with this Kohana 3 code:

try
{
    $entry = ORM::factory('blog');
    $entry->values(Request::current()->post());
    $entry->save();
}
catch (ORM_Validation_Exception $e)
{
    Session::instance()->set('form_errors', $e->errors(TRUE));
}

你会看到这很有用，它由处理记录保存的类抛出，并且 $ e->错误具有所有验证错误。当一切都设计为处理异常时，你可以确定它是一个好的做法和一个非常方便的。但这不是CI2的情况，所以也许我应该说，没有使用异常。

You'll see this is useful, you don't throw the exception, it's thrown by the class that handles the record saving and $e->errors has all the validation errors. When everything is designed to work with exceptions, you can be sure it's a good practice and a very convenient one. But it's not the case of CI2, so maybe I should say go ahead without using exceptions.

try
{
    $this->load->model('blog');
    $this->blog->save_entry($this->input->post());   // Handle validation inside the model with the Form_validation library
}
catch (Validation_Exception $e)   // You throwed your custom exception with the failed validation information
{
    // Do something with your custom exception like the kohana example
    $this->session->set('form_errors', $e->errors());
}

我希望一切都是可以理解的，也许有人有另一个有趣的意见和更多高效实施。再见。

I hope everything is understandable and maybe there's someone with another interesting opinion and a more efficient implementation. Bye.

这篇关于CodeIgniter和抛出异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！