课后拓展：
MyISAM与InnoDB两者之间区别与选择 https://www.cnblogs.com/y-rong/p/5309392.html https://www.cnblogs.com/y-rong/p/8110596.html 了解下Mysql的间隙锁及产生的原因 https://www.cnblogs.com/wt645631686/p/8324671.html grant授权和revoke回收权限 https://www.cnblogs.com/kevingrace/p/5719536.html centos7自带数据库MariaDB重启和修改密码 https://blog.csdn.net/shachao888/article/details/50341857 MySQL添加用户、删除用户与授权 https://www.cnblogs.com/wanghetao/p/3806888.html 深度认识 Sharding-JDBC：做最轻量级的数据库中间层 https://my.oschina.net/editorial-story/blog/888650