http://blog.youkuaiyun.com/kenhins/article/details/21414295
http://blog.youkuaiyun.com/he_hchx/article/details/1586445
http://blog.youkuaiyun.com/hotdust/article/details/3888241 这个告诉我们,中文的最大字数
6.除mysql外的驱动:
http://blog.youkuaiyun.com/xianggelilaling/article/details/5634809
http://blog.youkuaiyun.com/lucky_qing123/article/details/7765445