mysql锁文章
http://www.genshuixue.com/i-cxy/p/15285416
http://blog.csdn.net/hw_libo/article/details/39080809
http://hedengcheng.com/?p=771
https://yq.aliyun.com/articles/50926
http://blog.csdn.net/ifollowrivers/article/details/73614549
http://www.uml.org.cn/sjjm/201205302.asp