在Laravel 5中使用中间件时未找到类'App\Http \Middleware\DB'

问题描述

所以我想检查数据库是否连接在laravel 5.我使用Middlewares为此。

So I want to check whether the database is connected in laravel 5.I used Middlewares for this.

中间件代码

Middleware.php

Middleware.php

命名空间App\Http \Middleware;

namespace App\Http\Middleware;

use Closure;


class MyMiddleware {

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {

            if(DB::connection()->getDatabaseName())
            {
                    echo "conncted sucessfully to database ".DB::connection()->getDatabaseName();
            }else{
                    die("Couldn't connect");
            }



        return $next($request);
    }

}

将其添加到kernel.php

added it to kernel.php

protected $routeMiddleware = [
    'error' => 'App\Http\Middleware\MyMiddleware',
    'auth' => 'App\Http\Middleware\Authenticate',
    'auth.basic' => 'Illuminate\Auth\Middleware\AuthenticateWithBasicAuth',
    'guest' => 'App\Http\Middleware\RedirectIfAuthenticated',
];

，我想检查特定路线是否有错误

and I want to check if there is an error in a particular route

Route::get('/wow', ['middleware' => 'error', function () {
    //
}]);

每一件事都适用于中间件，但是没有类或者laravel核心函数，如check db是工作的。我要解决吗？

Every thing works fine for the middleware but no classes or laravel core functions like check db is working.How do I solve it?

这是错误laravel显示

This is the error laravel shows

FatalErrorException in MyMiddleware.php line 18:
Class 'App\Http\Middleware\DB' not found

推荐答案

您正在名称空间 App\Http \Middleware 中工作。

You're working in namespace App\Http\Middleware. So it searches for DB in that namespace unless you specify otherwise.

要么设置

use DB;

或使用DB作为

\DB::connection()->...

有关命名空间的详细信息：

More info on namespaces: http://php.net/manual/en/language.namespaces.php

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