code: public Map getSingleInfoService(Map requestParamMap,String tableName,Map sortMap) throws Exception{
  		List retList= getInfoListAllServiceInner(requestParamMap,tableName,sortMap,"","","",1);
  		if(retList==null || retList.size()<=0){
  			return null;
  		}
  		return (Map) retList.get(0);
  	}
docs: single