public function __construct($symb, $portfolio)
 {
     // setup the the parent class (db connection etc)
     $workingDate = $portfolio->getWorkingDate();
     $exch = $portfolio->exch->getID();
     $pfid = $portfolio->getID();
     $this->pfid = $pfid;
     parent::__construct($symb, $exch, $workingDate);
     // load the info from the stocks table
     $query = "select * from holdings where symb = '{$symb}' and pfid = '{$pfid}';";
     try {
         $result = $this->dbh->query($query);
     } catch (PDOException $e) {
         tr_warn('holding:__construct:' . $query . ':' . $e->getMessage());
         die("[FATAL]Class: holding, function: __construct\n");
     }
     $row = $result->fetch(PDO::FETCH_ASSOC);
     if (isset($row['symb']) and $row['symb'] == $symb) {
         $this->hid = $row['hid'];
         $this->pfid = $row['pfid'];
         $this->openDate = $row['date'];
         $this->price = $row['price'];
         $this->qty = $row['volume'];
         $this->comment = $row['comment'];
     }
 }