code: public function set($name, $value)
      {
          if (!array_key_exists($name, $this->row)) {
              $this->addField($name, $value);
          } else {
              $this->row[$name] = $value;
          }
          $this->informChanges();
      }
docs: Set a string value to existing field name
  @param string $name
  @param string $value