Error updating data of 1 column by id in Codeigniter 3 database - codeigniter

Question

I am posting the hosting order and I want to increase the "number of sales" column in my "hostings" table, but the data of all packages in my hostings table is increasing.
Here is my relevant code, I can say that there is no method I haven't tried.
$hostingdata = $this->db->query("select number_of_sales from hostings where id=" . $this->input->post('package_id'))->row();
$quantity = 1;
$new_number_of_sales = $hostingdata->number_of_sales + $quantity;
$data = array(
'number_of_sales' => $new_number_of_sales
);
$this->db->update('hostings', $data);
//FULL CODE
public function buy_hosting_post()
{
if ($this->input->post('package_id') && $this->session->userdata('id')) {
$hosting = $this->db->from('hostings')->where('id', $this->input->post('package_id'))->get()->row_array();
if ($hosting) {
$data = array(
'user_id' => $this->session->userdata('id'),
'domain' => $this->input->post('domain'),
'price' => $this->input->post('price'),
// 'end_date' => date('Y-m-d h:i:s',$end_date),
'package_id' => $hosting['id'],
'package_title' => $hosting['name'],
'payment_status' => 0,
);
$this->db->insert('hosting_orders', $data);
$hostingdata = $this->db->query("select number_of_sales from hostings where id=" . $this->input->post('package_id'))->row();
$quantity = 1;
$new_number_of_sales = $hostingdata->number_of_sales + $quantity;
$data = array(
'number_of_sales' => $new_number_of_sales
);
$this->db->update('hostings', $data);
$hosting_order_successful = array(
'hosting_order_successful' => 'success',
);
$this->session->set_userdata('hosting_order_successful', $hosting_order_successful);
redirect(("hosting-siparisi-olusturuldu"));
} else {
redirect(base_url());
}
} else {
redirect(base_url());
}
}

Answer 1

I solved the problem in the following way, but it makes the system heavy.
$hostingdata = $this->db->query("select number_of_sales from hostings where id=" . $this->input->post('package_id'))->row();
$quantity = 1;
$new_number_of_sales = $hostingdata->number_of_sales + $quantity;
$data = array(
'number_of_sales' => $new_number_of_sales
);
$this->db->where('id', $this->input->post('package_id')); // added here.
$this->db->update('hostings', $data);