Import multiple images to Drupal Image Field us...

Drupal 7.12, Migrate 2.3

class GarmentPictureMigration extends Migration {
  public function __construct() {
    parent::__construct(MigrateGroup::getInstance('plm'));
    $this->description = t('Migrate Garment Pictures from PLM.');
    
    $this->map = new MigrateSQLMap($this->machineName,
	    array(
	            'ID' => array(
                   'type' => 'varchar',
                   'size' => 'normal',
	               'not null' => TRUE,
	               'description' => 'User ID',
	    )
	    ),
	    MigrateDestinationNode::getKeySchema()
    );
 
    $fields = array(
          'ID' => 'ID',
          'IMAGES' => 'Images'
    );    
    
    $query = "select trim(style_id)||trim(color_id) ID 
              from PLM.SC_IMAGE WHERE MIGRATED=0 GROUP BY STYLE_ID,COLOR_ID";
    $count_query = "SELECT COUNT(1) FROM (SELECT 1 FROM PLM.SC_IMAGE GROUP BY STYLE_ID,COLOR_ID)";    
    
    global $conf;
    $this->source = new MigrateSourceOracle($conf['oracle_db'], $query, $count_query, $fields);
    $this->destination = new MigrateDestinationNode('garment_picture');
    
    $file_args = MigrateFileFieldHandler::arguments(array('source_field'=>'FILE_NAME'), 'file_blob', FILE_EXISTS_RENAME);
    $this->addFieldMapping('field_images', 'IMAGES')
    	 ->arguments($file_args);
  }
  
  public function prepareRow($row) {
  	$images = array();
  	
  	$s = oci_parse($this->source->getConnection(), 
                        "SELECT rawtohex(id) id,file_name, file_blobfied_date
                        FROM PLM.SC_IMAGE WHERE trim(STYLE_ID) || trim(COLOR_ID) ='". $row->ID ."'");
  	oci_execute($s, OCI_DEFAULT);
  	while (oci_fetch($s)) {
  		$blob = oci_result($s, "FILE_BLOB")->load();
  		$data = array(
  					'path' => oci_result($s, "ID").'.jpg',
  					'alt' => oci_result($s, "FILE_NAME"),
  					'title' => oci_result($s, "FILE_NAME"),
  					'contents' => $blob,
  				);
  		$images[] = $data;
  		$row->FILE_NAME = oci_result($s, "FILE_NAME");
  	}
  	$row->IMAGES = $images;
  	
  	return TRUE;
 }

//修改MigrateFileFieldHandler, modules/migrate/plugins/destinations/fields.inc 275行
public function prepare($entity, array $field_info, array $instance, array $values) {
      $destination_dir = $this->destinationDir($field_info, $instance);
      file_prepare_directory($destination_dir, FILE_CREATE_DIRECTORY);
      foreach($values as $value){
	      $destination_file = file_stream_wrapper_uri_normalize($destination_dir . "/" . str_replace('/', '-', $value['path']));
	      if (!file_exists($destination_file)) {
	        try {
	          $return = (bool) file_put_contents($destination_file, $value['contents']);
	        }
	        catch (Exception $exception) {
	          throw new MigrateException("Can't write file to: $destination_file");
	          return FALSE;
	        }
	      }
      }    
}

//修改MigrateFileFieldHandler, modules/migrate/plugins/destinations/fields.inc 357行
protected function buildFileArray($entity, array $field_info, array $instance, $migration, $arguments, $value) {
      if (is_array($value) || $value{0} == '{') {
        $properties = is_array($value) ? $value : drupal_json_decode($value);
        $path = $properties['path'];
        // Properties passed in with the image override any set via arguments
        if (!empty($properties['path'])) {
        	$arguments['source_path'] = $properties['path'];
        }
        if (!empty($properties['alt'])) {
          $arguments['alt'] = $properties['alt'];
        }
        if (!empty($properties['title'])) {
          $arguments['title'] = $properties['title'];
        }
        if (!empty($properties['description'])) {
          $arguments['description'] = $properties['description'];
        }
        if (!empty($properties['display'])) {
          $arguments['display'] = $properties['display'];
        }
      }
      else {
        $path = $value;
      }
}