Laravel 5 如何处理异常和错误信息？
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How to Handle Exceptions and Error Messages in Laravel 5?
提问by Hussain Ali
When i get this error:
当我收到此错误时：
QueryException in Connection.php line 620: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry
Connection.php 第 620 行中的 QueryException：SQLSTATE[23000]：违反完整性约束：1062 重复条目
can i handle it with my own flash error message instead of:
我可以用我自己的 Flash 错误消息而不是：
Whoops, looks like something went wrong
哎呀，看起来出事了
回答by Moppo
You have two ways to handle exceptions and show a custom response:
您有两种处理异常和显示自定义响应的方法：
1) Let the framework handle them for you:
1）让框架为您处理它们：
If you don't handle exceptions by yourself, Laravel will handle them in the class:
如果你不自己处理异常，Laravel 会在类中处理它们：
App\Exceptions\Handler
In the rendermethod you can intercept the renderning of all the exceptions the framework rises.
So, if you want to do something in particular when a specific exception rises, you can modify that method this way:
在该render方法中，您可以拦截框架出现的所有异常的渲染。因此，如果您想在特定异常出现时做一些特别的事情，您可以通过以下方式修改该方法：
public function render($request, Exception $e)
{
//check the type of the exception you are interested at
if ($e instanceof QueryException) {
//do wathever you want, for example returining a specific view
return response()->view('my.error.view', [], 500);
}
return parent::render($request, $e);
}
2) Handle the exceptions by yourself:
2）自己处理异常：
You can handle exceptions by yourself, with try-catchblocks. For example in a controller's method:
您可以使用try-catch块自己处理异常。例如在控制器的方法中：
try
{
//code that will raise exceptions
}
//catch specific exception....
catch(QueryException $e)
{
//...and do whatever you want
return response()->view('my.error.view', [], 500);
}
The main difference between the two cases is that in case 1you are defining a general, application-wide approachto handle specific exceptions.
这两种情况的主要区别在于，在情况 1 中，您定义了一种通用的、应用程序范围的方法来处理特定异常。
On the other hand, in case 2, you can define exception hadling in specific pointsof your application
另一方面，在情况 2 中，您可以在应用程序的特定点定义异常处理
回答by Hussain Ali
This is work with me fine
这对我来说很好用
if ($e instanceof \PDOException) {
$dbCode = trim($e->getCode());
//Codes specific to mysql errors
switch ($dbCode)
{
case 23000:
$errorMessage = 'my 2300 error message ';
break;
default:
$errorMessage = 'database invalid';
}
return redirect()->back()->with('message',"$errorMessage");
}
