need help vor mySQL Query!!

Aloha,

I have a sql query looks like this 1:1 test query this is it how I have to used it.

Code:

insert into files (created,name,timestamp)values (now(),'xxxx', '2015-08-26 00:00:00')
ON DUPLICATE KEY UPDATE created=NOW(),status='NEW';

and I like have it so ,for exampel.

PHP Code:

public function get_select_file() {
 $this->db->select ( 'id' );
 $this->db->from ( 'table' );
 $this->db->where ( 'name', 'xxxx' );
 $this->db->where ( 'timestamp', '2015-08-26 00:00:00' );
 $query = $this->db->get ();
 return $query->result_array ();
 } 


or some thing like this pleas help my !!