php/app/model/BaseModel.php

<?php
/**
 * Created by PhpStorm.
 * User: 道行
 * Date: 2021-01-17
 * Time: 17:46
 */

namespace app\model;

use think\Model;

class BaseModel extends Model
{

    //返回模型实例
    public static function getInstance()
    {
        return new static();
    }

    //获取某一条数据
    public function getOne($where)
    {
        if (!is_array($where)) {
            $where = [$this->getPk() => $where];
        }
        return $this->where($where)->find();
    }
}