``` use think\Db; // 启动事务 Db::startTrans(); try { //添加订单, order $insertGetId = $this->common_create_order(); //新增订单商品,order_googs $amount = $this->common_create_order_coupon($data, $insertGetId); } catch (\Exception $e) { // 回滚事务 Db::rollback(); $this->error('操作数据库失败,请重试,如无法解决请联系管理员!'); } Db::commit();//关闭事务,并且执行sql ```