Java 如何根据用户输入（扫描程序）获取SQL准备语句

我在创建准备好的语句时遇到困难，该语句选择并打印出符合条件的行：

SELECT ReservationStartDate, ReservationEndDate FROM treservations WHERE ReservationStartDate< **?** AND ReservationEndDate> **?**

创建的对象是

checkdatesforeservation

方法的参数

SQL，其中两个参数“？”表示来自用户输入的日期

我需要while循环来查找所有行

最后我需要返回一个列表

公共静态列表checkdatesforeservation（预订）{
List reservationList=新建ArrayList（）；
String sql2=“从ReservationStartDate=？和ReservationEndDate=？”中选择ReservationStartDate、ReservationEndDate；
试一试{
PreparedStatement ps=ConnectorDB.connection.prepareStatement（sql2）；
ResultSet ResultSet=ps.executeQuery（）；
while（resultSet.next（））{
ps.setString（1，reservation.getReservationStartDate（））；
ps.setString（2，reservation.getReservationEndDate（））；
reservationList.add（预订）；
}
}捕获（SQLE异常）{
e、 getStackTrace（）；
}
返回预订列表；
}

您需要在执行语句之前设置参数

        PreparedStatement ps = ConnectorDB.connection.prepareStatement(sql2);
        ps.setString(1,reservation.getReservationStartDate());
        ps.setString(2,reservation.getReservationEndDate());
        ResultSet resultSet = ps.executeQuery();
        while (resultSet.next()){
            reservationList.add(reservation);
        }

请参阅

公共静态列表checkdatesforeservation（预订）{
保留=空；
List reservationList=新建ArrayList（）；
String sql2=“从ReservationStartDate=？和ReservationEndDate=？”中选择ReservationStartDate、ReservationEndDate；
试一试{
PreparedStatement ps=ConnectorDB.connection.prepareStatement（sql2）；
ps.setString（1，reservation.getReservationStartDate（））；
ps.setString（2，reservation.getReservationEndDate（））；
ResultSet ResultSet=ps.executeQuery（）；
while（resultSet.next（））{
保留=新保留（）；
reservation.setReservationStartDate（rs.getString（“ReservationStartDate”）；
setReservationEndDate（rs.getString（“ReservationEndDate”）；
reservationList.add（预订）；
}
}捕获（SQLE异常）{
e、 getStackTrace（）；
}
返回预订列表；
}

问题是什么？你有错误吗？谢谢。但由于某种原因，我得到的预订列表是空的。但现在我对这个解决方案很满意，需要仔细看看。

public static List<Reservation> getAllReservation(){
        List<Reservation> reservationsList = new ArrayList<>();
        String sql = "SELECT * FROM `treservations`";
        try{
            PreparedStatement ps = ConnectorDB.connection.prepareStatement(sql);
            ResultSet resultSet = ps.executeQuery();
            while (resultSet.next()){
                Reservation reservation = new Reservation();
                reservation.setReservationID(resultSet.getInt("ReservationID"));
                reservation.setCarID(resultSet.getInt("CarID"));
                reservation.setReservationStartDate(resultSet.getString("ReservationStartDate"));
                reservation.setReservationEndDate(resultSet.getString("ReservationEndDate"));
                reservation.setPesel(resultSet.getString("Pesel"));
                reservationsList.add(reservation);
            }
        }catch (SQLException e){
            e.printStackTrace();
        }
        return reservationsList;
    }

    public static Reservation clientReservationMenuInput(){
        Scanner scanner = new Scanner(System.in);
        String regData = "\\d{4}-\\d{2}-\\d{2}";
        System.out.println("2 Reservation start date (YYYY-MM-DD) ");
        String ReservationStartDate;
        while (!(ReservationStartDate=scanner.next()).matches(regData)){
            System.out.printf("Date format not correct, Please try once again\n");
        }
        System.out.println("3 Reservation end date (YYYY-MM-DD) ");
        String ReservationEndDate;
        while (!(ReservationEndDate=scanner.next()).matches(regData)){
            System.out.printf("Date format not correct, Please try once again\n");
        }
        Reservation reservation = new Reservation();
        reservation.setReservationStartDate(ReservationStartDate);
        reservation.setReservationEndDate(ReservationEndDate);
        return reservation;
    }

    public static List<Reservation> checkDatesForReservation(Reservation reservation){
        List<Reservation> reservationList = new ArrayList<>();
        String sql2= "SELECT ReservationStartDate, ReservationEndDate FROM treservations WHERE ReservationStartDate=? AND ReservationEndDate= ?";
        try{
            PreparedStatement ps = ConnectorDB.connection.prepareStatement(sql2);
            ResultSet resultSet = ps.executeQuery();
            while (resultSet.next()){
                ps.setString(1,reservation.getReservationStartDate());
                ps.setString(2,reservation.getReservationEndDate());
                reservationList.add(reservation);
            }
        }catch (SQLException e){
            e.getStackTrace();
        }
        return reservationList;
    }

        PreparedStatement ps = ConnectorDB.connection.prepareStatement(sql2);
        ps.setString(1,reservation.getReservationStartDate());
        ps.setString(2,reservation.getReservationEndDate());
        ResultSet resultSet = ps.executeQuery();
        while (resultSet.next()){
            reservationList.add(reservation);
        }