20170506_2.cpp

       template<typename... Ts>
       void variadicExecutor(Ts&&...) {}
   
       template<typename... TS>
       bool execute(Poco::Data::Session& session, std::string sql, TS... Fargs)
       {
           Poco::Data::Statement stmt = session << sql;
           //because for `AbstractExtractors` `comma-operator` is covering this 
           //function. And behind the scene of `into` is exactly `AbstractExtractors`.
           variadicExecutor(stmt.addExtract(Fargs)...);
           stmt.execute();
       }

       //Somewhere else
       execute(session, query,
         into(pHomer),
         into(aBart),
         into(pLisa));