ThinkPHP 事务处理 （事务回滚） 、异常处理

$tran_result = true;
                $trans = M();
                $trans->startTrans();

try {
                    // 更新实施
                    $busbidList = M("busbid")->where($map)->select();
                    foreach($busbidList as $k => $v) {
                        $map['id'] = $busbidList[$k]['id'];
                        $result = M('busbid')->where($map)->data($data)->save();
                        if ($result === false) {
                            throw new Exception();
                        }
                    }
                } catch (Exception $ex) {
                    $tran_result = false;
                }

if ($tran_result === false) {
                    $trans->rollback();
                    // 更新失败
                    $array['status'] = 0;
                } else {
                    $trans->commit();
                    // 更新成功
                    $array['status'] = 1;
                }

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