Sjzs_admin/application/common/model/SiteModel.php

<?php
namespace app\common\model;

use think\Db;
use think\db\Query;
use think\Model;
class SiteModel extends Model{
    protected $name='system_site';
    public $autoWriteTimestamp=true;



    public function kd(){
        return KdModel::select();
    }
    public function towns(){
        return $this->hasOne(TownsModel::class,'id');
    }
}