app-api/app/Models/OrderOnceW.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class OrderOnceW extends Model
{
    use SoftDeletes;
    protected $connection = 'mysql_w';
    protected $table='order_once';
    protected $guarded=[];
}