DB悲观锁

http://space.itpub.net/519536/viewspace-612048

http://space.itpub.net/?uid-17203031-action-viewspace-itemid-694383

http://bbs.csdn.net/topics/310230362

http://www.cnblogs.com/deadshot123/archive/2006/11/28/574899.html

关于锁的文章：

http://www.cnblogs.com/lxconan/archive/2011/10/20/2218396.html

http://www.cnblogs.com/careyson/archive/2012/03/22/2411292.html

http://www.cnblogs.com/CareySon/archive/2012/01/29/2331088.html

http://blog.csdn.net/zjcxc/article/details/1133843

Hadoop讲座：

http://database.51cto.com/exp/hadoop0413/index.html