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Merge pull request #962 from MurphyL/patch-1

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修改错别字：事物 -> 事务
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@ -159,9 +159,9 @@ select sql_no_cache count(*) from usr;
事务最经典也经常被拿出来说例子就是转账了。假如小明要给小红转账1000元，这个转账会涉及到两个关键操作就是：将小明的余额减少1000元，将小红的余额增加1000元。万一在这两个操作之间突然出现错误比如银行系统崩溃，导致小明余额减少而小红的余额没有增加，这样就不对了。事务就是保证这两个关键操作要么都成功，要么都要失败。
### 事物的四大特性(ACID)
### 事务的四大特性(ACID)
![事物的特性](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-6/事务特性.png)
![事务的特性](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-6/事务特性.png)
1. **原子性（Atomicity）：** 事务是最小的执行单位，不允许分割。事务的原子性确保动作要么全部完成，要么完全不起作用；
2. **一致性（Consistency）：** 执行事务后，数据库从一个正确的状态变化到另一个正确的状态；