app-api/app/Models/ShowNumW.php

<?php
namespace App\Models;

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

class ShowNumW extends Model{
    protected $connection = 'mysql_w';
    protected $table='show_num';
    protected $fillable=['obj_id','obj_type','id','type','name','num'];
}