prevent database update when no where statement found

[eluser]Michael Wales[/eluser]
Don't carelessly omit the where statement.

Code:

function save($id = NULL, $new_data = array()) {
  if ((is_int($id)) && (count($new_data) > 0)) {
    $query = $this->db->update('table', $new_data, array('id' => $id));
    if ($this->db->affected_rows() === 1) {
      return TRUE;
    }
  }
  return FALSE;
}