https://www.safaribooksonline.com/library/view/neo4j-graph-data/9781784393441/ch07.html

http://www.vertabelo.com/blog/technical-articles/security-approaches-in-data-modeling-part-1-simple-access-control-to-a-small-data-model

http://www.tonymarston.net/php-mysql/role-based-access-control.html

https://www.zhihu.com/question/20313385

http://www.blogjava.net/amigoxie/archive/2007/10/08/151086.html

http://blog.csdn.net/liangyixin19800304/article/details/12426957

http://blog.csdn.net/liangpei2008/article/details/16944657