codeigniter where order by

1$this->db->from($this->table_name);
2$this->db->order_by("name", "asc");
3$query = $this->db->get(); 
4return $query->result();

1$this->db->select('ae_users.employee_id, ae_users.emp_name, ae_users.emp_name2, ae_users.emp_name3');
2		$this->db->from('ae_users');                
3		$this->db->where_in('ae_users.employee_id',$employee_ids);
4     
5		$query =$this->db->get();
6             
7		if ($query->num_rows()) {
8			return $query->result_array();
9		} else {
10			return 0;
11		}

1$this->db->select('ae_users.employee_id, ae_users.emp_name, ae_users.emp_name2, ae_users.emp_name3');
2		$this->db->from('ae_users');                
3		$this->db->where_in('ae_users.employee_id',$employee_ids);
4                $this->db->_protect_identifiers = FALSE; // stop CI adding backticks
5                $order = sprintf('FIELD(ae_users.employee_id, %s)', implode(', ', $employee_ids));
6                $this->db->order_by($order);
7                $this->db->_protect_identifiers = TRUE; 
8		$query =$this->db->get();
9               // echo '<pre>'; print_r($this->db->last_query());exit;
10		if ($query->num_rows()) {
11			return $query->result_array();
12		} else {
13			return 0;
14		}