GatewayWorker内置的Mysql查询函数inner join查不到数据

$result = $ret->query("select *  from protype_brand inner join protype on protype_brand.protype_id=protype.protype_id where protype_brand.product_code='{$product_code}'");

 $result = $ret->select('*')
                ->from('protype_brand')
                ->innerJoin('protype', 'protype_brand.protype_id = protype.protype_id')
                ->where("protype_brand.product_code = '{$product_code}'");