public boolean DecrementListingQuantity(Listing listing) {
	    if (!dbConnStatus) {
	        this.PrintDebugMessage("DecrementListingQuantity", "No connection with database");
	        return false;
	    }

	    try {
	        Statement stmt;
	        dbConn.setAutoCommit(false);
	        stmt = dbConn.createStatement();
	        stmt.executeUpdate("UPDATE listings SET quantity = quantity - 1 WHERE id = " + listing.getId() + ";" );
	        dbConn.commit();
	        listing.setNumviews(listing.getQuantity() - 1); //update local object
	        return true;
	    } catch (SQLException e) {
	        return false;
	    }
	}