protected function topString( $limit){
        if(isset($limit) && ($this->notORM->driver == "dblib" || $this->notORM->driver == "mssql" || $this->notORM->driver == "sqlsrv")){
            return " TOP ($this->limit)"; //! offset is not supported
        }
        return "";
    }
protected function topString( $limit){
        if(isset($limit) && ($this->notORM->driver == "dblib" || $this->notORM->driver == "mssql" || $this->notORM->driver == "sqlsrv")){
            return " TOP ($this->limit)"; //! offset is not supported
        }
        return "";
    }
@param      $limit

@return string