t_nine/app/Model/PurchaseOrderFile.php

<?php

namespace App\Model;

use Illuminate\Database\Eloquent\Model;

class PurchaseOrderFile extends Model
{
    protected $table = "purchase_order_file"; //指定表
    const CREATED_AT = 'crt_time';
    const UPDATED_AT = null;
    protected $dateFormat = 'U';
    const type_one = 1; // 文件
    public static $type = [
        self::type_one,
    ];
}