cxinv/app/admin/model/CompanyInfo.php

<?php
declare (strict_types = 1);

namespace app\admin\model;

use think\Model;

/**
 * @mixin \think\Model
 */
class CompanyInfo extends Model
{

    public static function getRegisterCode($code){
       return CompanyInfo::where(['companyNo'=>$code])->value("company_license","");
    }
}