LitePal的基本用法
http://blog.csdn.net/guolin_blog/article/details/38556989
github地址：https://github.com/LitePalFramework/LitePal
Google Room 教程 http://www.cnblogs.com/zqlxtt/p/6895717.html http://mt.sohu.com/it/d20170524/143036357_733133.shtml https://developer.android.com/topic/libraries/architecture/room.html
