laravel+workerman的event监听文件用不了数据库，找不到驱动

[weixin_38651940]

use App\User;
use GatewayWorker\Lib\Gateway;
use Illuminate\Support\Facades\Log;
class Event
{
...
//当客户端发来数据(Gateway进程收到数据)后触发的回调函数
    public static function onMessage($client_id, $message)
    {
        $response = ['code' => 0, 'msg' => 'ok', 'data' => []];
        $message = json_decode($message);

        //根据接收到的客户端数据的不同模式 进行相应的处理以及回复。
        if (!isset($message->type)) {
            $response['code'] = 500;
            $response['msg'] = 'fail';
            Gateway::sendToClient($client_id, json_encode($response));
        } else {
            switch ($message->type) {
                case 'check':
                    // do something ...
                    $response['code'] = 200;
                    $response['msg'] = 'OK';
                    $uid = $message->uid;
                    $user = User::find($uid);
//                    Gateway::bindUid($client_id,$uid);
                    $arr = [
                        'username' => $user->name
                    ];
//                    Gateway::setSession($client_id,$arr);
                    $response['data'] = [$arr];
                    break;
                default:
                    $response['code'] = 500;
                    $response['msg'] = 'Undefined';
            }

            Gateway::sendToClient($client_id, json_encode($response));
        }
    }
...
}

服务器报错了PDOException: could not find driver

请各路大神指导一下