参照python 操作mysql
python-mysqldb : http://www.cnblogs.com/wupeiqi/articles/5095821.html (python3 不支持)
pymysql : http://www.cnblogs.com/wupeiqi/articles/5713330.html
ORM sqlachemy学习:http://www.cnblogs.com/alex3714/articles/5978329.html