Pflicht: hook_schema
Kein Erstellen/Entfernen der externen Tabelle (hook_install, hook_uninstall)

function aktionen_install() {
  // no drupal_install_schema for external table
  //drupal_install_schema('aktionen');
}

function aktionen_uninstall() {
  // no drupal_uninstall_schema for external table
  //drupal_uninstall_schema('aktionen');
}

function aktionen_schema() {
  $schema = array();
 
  $schema['aktionen'] = array(
    'description' => 'Stores action information.',
    'fields' => array(
      'aid' => array(
        'description' => 'Primary Key: Unique actions ID.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '0',
      ),
      'type' => array(
        'description' => 'The object that that action acts on (node, user, comment, system or custom types.)',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => '',
      ),
      'callback' => array(
        'description' => 'The callback function that executes when the action runs.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'parameters' => array(
        'description' => 'Parameters to be passed to the callback function.',
        'type' => 'blob',
        'not null' => TRUE,
        'size' => 'big',
      ),
      'label' => array(
        'description' => 'Label of the action.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '0',
      ),
    ),
    'primary key' => array('aid'),
  );
 
 
  return $schema;
}