BooksController.php

App::uses('CsvFileObject', 'Lib');
App::uses('CsvIterator', 'Lib');
//...
public function upload() {
  $file = $this->data['Book']['file'];
  if ($file['error'] === UPLOAD_ERR_OK) {
  
    if (move_uploaded_file($file['tmp_name'], APP.'webroot/uploads'.DS.$file['name'])) {
      $path = APP.'webroot/uploads'.DS.$file['name'];
      
        $file = new CsvFileObject($path);
        $csv = new CsvIterator($file);
     
        for($csv->rewind(); $csv->valid();$csv->next()){
          ClassRegistry::init('Book')->saveAll($csv->current());
        }
    }
  }
  return false;
}