Php 如何处理Laravel 5中的PDO异常

我已将Exceptions/Handler.php修改为：

    <?php namespace App\Exceptions;

use Exception;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Illuminate\Database\Eloquent\ModelNotFoundException as ModelNotFoundException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

class Handler extends ExceptionHandler {

    /**
     * A list of the exception types that should not be reported.
     *
     * @var array
     */
    protected $dontReport = [
    'Symfony\Component\HttpKernel\Exception\HttpException'
    ];

    /**
     * Report or log an exception.
     *
     * This is a great spot to send exceptions to Sentry, Bugsnag, etc.
     *
     * @param  \Exception  $e
     * @return void
     */
    public function report(Exception $e)
    {
        return parent::report($e);
    }

    /**
     * Render an exception into an HTTP response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Exception  $e
     * @return \Illuminate\Http\Response
     */
    public function render($request, Exception $e)
    {

        if($e instanceof NotFoundHttpException)
        {
            return response()->view('errors/404');
        }

        elseif ($e instanceof ErrorException) {
            return response()->view('errors/404');
        }

        elseif ($e instanceof ModelNotFoundException) {
            return response()->view('error_log(message)ors/404');
        }

        elseif($e instanceof PDOException)
        {
            return Redirect::to('install.php');
        }

        elseif($e instanceof QueryException)
        {
            return Redirect::to('install.php');
        }

        else return response()->view('errors/error');


    }

---

我想我已经找到了解决方案：

放

use PDOException; 

包括
使用异常

public function render($request, Exception $e)
    {

        if($e instanceof PDOException)
        {
            return response()->view('errors/404');
        }

在异常/处理程序中
它对我有效
这就是在Laravel 5.3中对我有效的内容（摘自
/app/Exceptions/
中我的
Handler.php
文件）：

或者尝试{}catch（\pdotexception$pde）{}
public function report(Exception $e)
{

    // Both this, and below, are needed
    if($e instanceof \PDOException) {
        return response()->view('errors/404');
    }

    return parent::report($e);
}

public function render($request, Exception $e)
{

    if($e instanceof \PDOException) {
        // TODO send me an email!
        Session::flash('messageclass', 'danger');
        Session::flash('message', trans('general.pdoexception'));
        return redirect()->back();
    }

    return parent::render($request, $e);
}