推荐回答（2个）
在mysql中可以把UUID作为逻辑主键，物理主键依然使用自增ID
1、UUID定义
UUID含义是通用唯一识别码 (Universally Unique Identifier)，这 是一个软件建构的标准，也是被开源软件基金会 (Open Software Foundation, OSF) 的组织应用在分布式计算环境 (Distributed Computing Environment, DCE) 领域的一部分。UUID是指在一台机器上生成的数字，它保证对在同一时空中的所有机器都是唯一的。
2、UUID优点
1） 能够保证独立性，程序可以在不同的数据库间迁移，效果不受影响。
2） 保证生成的ID不仅是表独立的，而且是库独立的，这点在你想切分数据库的时候尤为重要。
3） 在oracle做数据迁移的时候不会因为表的sequence不连续而出现问题
3、UUID缺点
1） 比较占地方，和INT类型相比，存储一个UUID要花费更多的空间。
2） 使用UUID后，URL显得冗长，不够友好。
当然可以使用uuid做主键，前提是 主键字段的长度要够 uuid的长度，你可以选择后台生成主键，也可以mysql 使用函数uuid()生成主键.
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