一些比较好的博文

MYSQL事务级别：http://blog.itpub.net/29254281/viewspace-1398273/  (可重复读)   

             http://blog.csdn.net/chen77716/article/details/6742128#t2 (MVCC)

深入理解Apache的mod_rewrite(htaccess)  http://www.yeeyan.org/articles/view/jcky/59298

             apache官网关于 rewrite的讲解： http://httpd.apache.org/docs/trunk/rewrite/