1.C.R.U.D. Generator for CodeIgniter

https://github.com/antonioyee/crud-generator/tree/9e5e48e773a52628f0bdae62db9e820d5bcead91

2.

类CI_DB_mysql_driver继承了CI_DB类，,然后CI_DB类 继承了CI_DB_active_record类，CI_DB_active_record类继承了CI_DB_driver类，
类CI_DB_driver是数据库的基类

http://blog.csdn.net/load_life/article/details/7226961

http://www.cnblogs.com/hubo2/p/3460246.html