如何更新房间数量？

Question

目前，我想在预订添加到数据库后更新我的房间可用性，但我现在面临的问题是，我不知道如何在预订后更新房间数量。

我需要的解决方案是，当我输入房间数量并添加时，房间数据库将减去房间数量。

DA室

public boolean updateRoomQuantity(String roomID, int amountOfRoomLeft){
    String sql = String.format("update room set roomAvailability =%d where roomID = '%s'", amountOfRoomLeft, roomID);
    try {
        stmt = conn.createStatement();
        stmt.executeUpdate(sql);
        return true;
    } catch (SQLException ex) {
        Logger.getLogger(RoomDA.class.getName()).log(Level.SEVERE, null, ex);
        JOptionPane.showMessageDialog(null, ex.getMessage(), "ERROR", JOptionPane.ERROR_MESSAGE);
        return false;
    }
}

预订DA

public boolean addRecord(String booID, String booDate, String booTime, String roomID, double roomPrice, int duration, String memberID,
        String receptionistID, String checkinStatus, double totalRoomPrice, double totalPrice) {
    String sql = String.format("insert into booking values('%s','%s','%s','%s',%.2f,%d,'%s','%s','%s',%.2f,%.2f)", booID, booDate, booTime, roomID, roomPrice, duration, memberID, receptionistID, checkinStatus, totalRoomPrice, totalPrice);
    try {
        stmt = conn.createStatement();
        stmt.executeUpdate(sql);
        return true;
    } catch (SQLException ex) {
        Logger.getLogger(BookingDA.class.getName()).log(Level.SEVERE, null, ex);
        JOptionPane.showMessageDialog(null, ex.getMessage(), "ERROR", JOptionPane.ERROR_MESSAGE);
        return false;
    }
}

预订面板添加按钮

private void addBooking() {
    double total = 0.0;
    int roomQuantity= Integer.parseInt(jtfRoomQuantity.getText().trim());
    double price = Double.parseDouble(jtfRoomPrice.getText().trim());

    total = (roomQuantity* price);
    jtfTotalPrice.setText(String.valueOf(total));
    jtfTotalRoomPrice.setText(String.valueOf(total));
    if (!emptyFields()) {
        if (jcbAutoFillDate.isSelected()) {
            jbtFillInDate.doClick();
        }
        String booID = jtfBookingID.getText();
        String booDate = jtfBookingDate.getText();
        String booTime = jtfBookingTime.getText();
        String roomID = null;
        Room room = roomDA.getRecordByName(jtfAutoCompleteRoom.getText());
        double roomPrice = Double.parseDouble(jtfRoomPrice.getText());
        String memberID = null;
        Member member = memberDA.getRecordByName(jtfAutoCompleteMember.getText());
        String receptionistID = receptionistDA.getRecordByName(jcbAvailableReceptionist.getSelectedItem().toString()).getReceptionistID();
        String checkinStatus = jcbStatus.getSelectedItem().toString();
        double totalRoomPrice = Double.parseDouble(jtfTotalRoomPrice.getText());
        double totalPrice = Double.parseDouble(jtfTotalPrice.getText());

        memberID = member.getMemberID();
        roomID = room.getRoomID();

        if (bookingDA.addRecord(booID, booDate, booTime, roomID, roomPrice, duration, memberID, receptionistID, checkinStatus, totalRoomPrice, totalPrice)) {
            JOptionPane.showMessageDialog(null, "Successfully added");
            refreshTableContent();
            autoResizeTable();
            reset();
        }
    }
}

Answer 1

  

使用roomAvailability = roomAvailability -1

public boolean updateRoomQuantity(String roomID, int amountOfRoomLeft){
        String sql = String.format("update room set roomAvailability =roomAvailability-1 where roomID = '%s'", roomID);
        try {
            stmt = conn.createStatement();
            stmt.executeUpdate(sql);
            return true;
        } catch (SQLException ex) {
            Logger.getLogger(RoomDA.class.getName()).log(Level.SEVERE, null, ex);
            JOptionPane.showMessageDialog(null, ex.getMessage(), "ERROR", JOptionPane.ERROR_MESSAGE);
            return false;
        }
    }

在添加新记录之前检查可用性是否小于0.如果greter大于零则分配一个房间。否则分配另一个房间。

Answer 2

在您的预订DA中，您正在插入新的预订，因此您还有更新剩余房间的房间DA。

roomDA.updateRoomQuantity(roomId, amountOfRoomLeft);

roomId存在于您的预订中，唯一剩下的未知变量是amountOfRoomLeft。因此，您应该编写一个获取amounttOfRoomLeft

的新方法

类似的东西：

public int getRoomQuantity(String roomID){ String sql = String.format("select roomAvailability from room where roomID = '%s'", roomID); try { stmt = conn.createStatement(); ResultSet resultset = stmt.execute(sql); resultset.next(); return resultset.getInt(1); } catch (SQLException ex) { Logger.getLogger(RoomDA.class.getName()).log(Level.SEVERE, null, ex); JOptionPane.showMessageDialog(null, ex.getMessage(), "ERROR", JOptionPane.ERROR_MESSAGE); } }

你也应该自己做作业：））