book_admin/application/common/model/PolarDbModel.php

<?php
/**
 * Created by PhpStorm.
 * User: Elton
 * Date: 2020/4/9
 * Time: 17:50
 */

namespace app\common\model;

use think\Config;
use think\Model;

class PolarDbModel extends Model
{

    /**
     * PolarDbModel constructor.
     * @param array $data
     * @param bool $isPolarDb  是否使用PolarDb 数据库
     */
    public function __construct($data = [], $isPolarDb = true)
    {
        if ($isPolarDb) {
            $this->connection = Config::get('polardb') ?? [];
        }
        parent::__construct($data);
    }
}