最近在看mysql c/s 协议，以下几个文档/url 很不错：

http://kambing.ui.ac.id/onnopurbo/library/library-sw-hw/linux-howto/mysql/internals-en.pdf

http://dev.mysql.com/doc/internals/en/overview.html

http://dev.mysql.com/doc/internals/en/text-protocol.htm

http://fossies.org/unix/privat/mysql-proxy-0.8.3.tar.gz:a/mysql-proxy-0.8.3/doc/chapter/protocol.txt