code: public void fetchChildern(HttpServletRequest request, ViewNode node) {
      Collection childernNode = null;
      try {
        childernNode = getChildern(request, node);
  
        Iterator iter = childernNode.iterator();
        while (iter.hasNext()) {
          ViewNode nodeChild = (ViewNode) iter.next();
          node.addChild(nodeChild);
        }
      } catch (Exception ex) {
        Debug.logError(ex, module);
      }
    }
docs: 需要查询数据库，将该节点下的子节点查询获取
  @param request
  @param node