DB\Cursor::update PHP Method

    abstract function update();

 function update()
 {
     $res = $this->mapper->update();
     if (is_array($res)) {
         $res = $this->mapper;
     }
     if (is_object($res)) {
         $res = $this->factory($res);
     }
     return is_int($res) ? $this : $res;
 }