[事务是什么](%E4%BA%8B%E5%8A%A1%E6%98%AF%E4%BB%80%E4%B9%88.md) [事务的作用](%E4%BA%8B%E5%8A%A1%E7%9A%84%E4%BD%9C%E7%94%A8.md) [事务的4个特性](%E4%BA%8B%E5%8A%A1%E7%9A%844%E4%B8%AA%E7%89%B9%E6%80%A7.md) [事务隔离级别](%E4%BA%8B%E5%8A%A1%E9%9A%94%E7%A6%BB%E7%BA%A7%E5%88%AB.md) [事务的实现](%E4%BA%8B%E5%8A%A1%E7%9A%84%E5%AE%9E%E7%8E%B0.md)