drupal操作数据库的api

  db_query:

 $node_limit = variable_get('recent_posts_block_count', 3);
      $content_type = 'blog';
      $query = db_query('SELECT n.nid FROM {node} n WHERE n.type = :type AND n.status = 1 ORDER BY n.created DESC LIMIT 0, ' . $node_limit, array(':type' => $content_type));
      $nids = $query->fetchCol();    //这是取得多个node的id
      $nodes = node_load_multiple($nids); //把上面取的id生成对象

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