悲观锁和乐观锁 · 数据库

![](https://img.kancloud.cn/8c/44/8c44d0dcd1a6e164704c34faaf69717d_734x324.png) ![](https://img.kancloud.cn/d8/3b/d83bb94a6731bb948aed43d5527dbe4d_1072x265.png) ![](https://img.kancloud.cn/54/04/5404f40a0af8520a26f4171796607c02_553x413.png) ![](https://img.kancloud.cn/98/f7/98f789187d5b6fb57fd1818b98900d46_1069x388.png)