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

Class 'App\Http\Middleware\DB' not found when using Middleware in Laravel 5

所以我想检查数据库是否已连接 laravel 5.I 为此使用了中间件。

中间件代码

Middleware.php

命名空间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

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

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

对于中间件来说一切正常,但没有 类 或 laravel 核心功能,例如检查数据库 working.How 我能解决吗?

这是 laravel 显示的错误

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

您正在命名空间 App\Http\Middleware 中工作。因此,除非您另有指定,否则它会在该命名空间中搜索数据库。

任意设置

use DB;

或将数据库用作

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

有关命名空间的更多信息:http://php.net/manual/en/language.namespaces.php