exchange/database/seeds/DatabaseSeeder.php

<?php

use Illuminate\Database\Seeder;
use Illuminate\Support\Facades\DB;

class DatabaseSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $this->call(UsersTableSeeder::class);
        $this->call(RolesAndPermissionsSeeder::class);
        $this->call(UserRoleSeeder::class);
        $this->call(RateTableSeeder::class);
        $this->call(BookTableSeeder::class);     
        $this->call(CreditTableSeeder::class);  
    }
}