Laravel php artisan db：seed 导致 “use” 语句错误

当我尝试运行时，我收到以下错误：php artisan db:seed

The use statement with non-compound name 'DB' has no effect

我根据文档中的片段编写了自己的播种器文件，并将其包含在下面。如您所见，我正在使用快捷方式 - 这就是问题所在吗？use DB

<?php

use Illuminate\Database\Seeder;
use Illuminate\Database\Eloquent\Model;
use DB;

class ClassesTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        DB::table('classes')->delete();
        DB::table('classes')->insert([
            'class_name'    => 'Test course 111',
            'class_id'      => '1',
            'location_name' => 'Barnes',
            'location_id'   => '1',
            'date'          => '2015-06-22',
            'month'         => '06/2015',
            'start_time'    => '08:00',
            'end_time'      => '16:00',
            'places'        => '19',
            'places_left'   => '19',
            'price'         => '155.00'
        ]);
    }
}