drupal 数据库表连接

  $taxo_menu = db_select("taxonomy_term_hierarchy", 'th');
  $taxo_menu->join('taxonomy_term_data', 't', 't.tid = th.tid');
  $taxo_menu->fields('th');
  $taxo_menu->fields('t');
  $taxo_menu->condition('parent', 0);
  $result_menu_taxonomy = $taxo_menu->execute();
  foreach ($result_menu_taxonomy as $row) {
    $options[$row->tid] = $row->name;
  }