从Oracle数据库向多个用户发送通知

Question

在Laravel中，我正在从Oracle数据库向用户发送电子邮件通知。与Oracle的连接正常，但是尝试向用户发送电子邮件通知时出现以下错误：

  

调用未定义的方法stdClass :: routeNotificationFor（）   my_project /供应商   /laravel/framework/src/Illuminate/Notifications/Channels/MailChannel.php

我的通知类别如下：

<?php

namespace App\Notifications;

use Illuminate\Notifications\Notifiable;
use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use App\User;

class Expired extends Notification
{
    use Queueable; 

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct( )
    { 
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {


    return ['mail']; 
    }

    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        return (new MailMessage)
                    ->line('The introduction to the notification.')
                    ->action('Notification Action', url('/'))
                    ->line('Thank you for using our application!');
    }

    /**
     * Get the array representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function toArray($notifiable)
    {
        return [
            //
        ];
    }
}

这是我发送通知的方式：

<?php
$end = Carbon::now()->addDays(15)->format('Y-m-d h:m:s');
$users = DB::select("select email from user_  where val_to >= '$end ' group by email   "); 

Notification :: send（$ users，new Expired（$ users））;