codeigniter数据库错误信息获取

db_debug – TRUE/FALSE (boolean) – Whether database errors should be displayed.
需要设置db_debug = false

Yes, this is the mysql_error() wrapper.

$this->db->_error_message();
And the mysql_errno wrapper is:

$this->db->_error_number();

via:
http://stackoverflow.com/questions/3234564/under-codeigniter-is-it-possible-to-see-mysql-error