update in codeigniter query

1$data = array(
2        'title' => $title,
3        'name' => $name,
4        'date' => $date
5);
6
7$this->db->where('id', $id);
8$this->db->update('mytable', $data);
9// Produces:
10//
11//      UPDATE mytable
12//      SET title = '{$title}', name = '{$name}', date = '{$date}'
13//      WHERE id = $id
14

1public function update_row(){
2		
3		$update_rows = array('field-name' => 'field-data',);
4		$this->db->where('id', 1 );
5		$this->db->update('table-name', $update_rows);	
6
7	}	

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		}

1public function update_row(){
2		
3		$update_rows = array(
4			'name' => 'rincky',
5			'address' => 'India',
6			'contact' => '98545785',
7			'department' => 'IT',
8
9		);
10		$this->db->where('id', 1 );
11		$result = $this->db->update('user', $update_rows);	
12		return $result;
13	}	

1$data = array(
2        'title' => $title,
3        'name' => $name,
4        'date' => $date
5);
6
7$this->db->where('id', $id);
8$this->db->update('mytable', $data);