code: public String getNodeData(String nodePath,String formId,String tableName,String dataColName,String idColName){
  
  		MicroMetaDao microDao=getInnerDao();
  		String select=dataColName+"->>'$."+dianNode(nodePath)+"' as dyna_data";
  		String sql="select "+select+" from "+tableName+" where "+idColName+"=?";
  		Object[] paramArray=new Object[1];
  		paramArray[0]=formId;
  		Map retMap=microDao.querySingleObjJoinByCondition(sql,paramArray);
  		//返回的一定是个map
  		if(retMap!=null){
  			return (String) retMap.get("dyna_data");
  		}
  		
  		return null;
  	}
docs: 页面获取指定节点数据(data)