myPakeAppendableLoadData.php

<?php
pake_desc('my load data');
pake_task('my_load_data','project_exists');

define('SF_ROOT_DIR',    realpath(dirname(__FILE__).'/../..'));

function run_my_load_data($task,$args){
  define('SF_APP',    array_shift($args));
  require_once(SF_ROOT_DIR.DIRECTORY_SEPARATOR.'apps'.DIRECTORY_SEPARATOR.SF_APP.DIRECTORY_SEPARATOR.'config'.DIRECTORY_SEPARATOR.'config.php');
  require_once('mysfPropelData.class.php');

  $databaseManager = new sfDatabaseManager();
  $databaseManager->initialize();

  $database = array_shift($args);
  $path = sfConfig::get('sf_data_dir').DIRECTORY_SEPARATOR.'fixtures'.DIRECTORY_SEPARATOR.$database;
  $data = new mysfPropelData();
  $is_append = false;
  if($args[count($args)-1] == "append"){
    $is_append = true;array_pop($args);
  }

  if(count($args) == 0){
    $data->loadData($path, $database, $is_append);
  }else{
    foreach($args as $filename){
      $data->loadData($path.DIRECTORY_SEPARATOR.$filename, $database, $is_append);
    }
  }
}
?>

mysfPropelData.class.php

<?php
class mysfPropelData extends sfPropelData {

  public function loadData($directory_or_file = null, $connectionName = 'propel', $is_append=false)
  {
    $fixture_files = $this->getFiles($directory_or_file);

    // wrap all database operations in a single transaction
    $this->con = Propel::getConnection($connectionName);
    try
    {
      $this->con->begin();

      if(!$is_append)
        $this->doDeleteCurrentData($fixture_files);

      $this->doLoadData($fixture_files);

      $this->con->commit();
    }
    catch (Exception $e)
    {
      $this->con->rollback();
      throw $e;
    }
  }
}
?>