设计一个长途汽车信息管理系统，包含以下信息：线路信息：包括线路编号、出发地、目的地、出发时间、所需时间。汽车信息：包括汽车编号、汽车种类和对应的票价、最大的载客量。票价信息：包括车票编号、售票情况、票价、折扣。用户信息：包括用户编号、出发地、目的地、出发时间。查询打印相应的信息。同时使用数据库连接技术，在java里实现某一模块的增删改查功能，请提供设计思路和详细代码

好的，以下是我为您提供的设计思路和详细代码。

设计思路：

1. 数据库设计：根据要求，需要设计线路信息、汽车信息、票价信息和用户信息四个表。每个表中包含相关字段，例如线路信息表包括线路编号、出发地、目的地、出发时间、所需时间等字段。

2. 系统界面设计：根据要求，需要设计一个用户界面，包括查询界面和管理员界面。查询界面包括出发地、目的地、出发时间等查询条件，管理员界面包括添加、删除、修改和查询功能。

3. 后台代码实现：根据数据库设计和系统界面设计，需要编写后台代码实现系统功能。例如，添加线路信息的后台代码实现如下：

public void addRoute(String routeId, String startLocation, String endLocation, String departureTime, String duration) {
    try {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "INSERT INTO routes (route_id, start_location, end_location, departure_time, duration) VALUES (?, ?, ?, ?, ?)";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, routeId);
        pstmt.setString(2, startLocation);
        pstmt.setString(3, endLocation);
        pstmt.setString(4, departureTime);
        pstmt.setString(5, duration);
        pstmt.executeUpdate();
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

4. 前端代码实现：根据系统界面设计，需要编写前端代码实现系统交互。例如，查询界面的前端代码实现如下：

<form>
  <label for="startLocation">出发地:</label>
  <input type="text" id="startLocation" name="startLocation"><br><br>
  <label for="endLocation">目的地:</label>
  <input type="text" id="endLocation" name="endLocation"><br><br>
  <label for="departureTime">出发时间:</label>
  <input type="datetime-local" id="departureTime" name="departureTime"><br><br>
  <input type="button" value="查询" onclick="query()">
</form>

详细代码实现：

1. 数据库设计

首先需要创建一个名为bus_info的数据库，然后创建四个表格：routes、cars、tickets、users。分别对应线路信息、汽车信息、票价信息和用户信息。

routes表格包含以下字段：route_id、start_location、end_location、departure_time、duration。

cars表格包含以下字段：car_id、car_type、price、capacity。

tickets表格包含以下字段：ticket_id、route_id、car_id、user_id、status、price、discount。

users表格包含以下字段：user_id、start_location、end_location、departure_time。

2. 后台代码实现

在Java中使用JDBC技术连接数据库，具体实现如下：

import java.sql.*;

public class BusInfoSystem {
    private String url = "jdbc:mysql://localhost:3306/bus_info";
    private String username = "root";
    private String password = "";

    // 添加线路信息
    public void addRoute(String routeId, String startLocation, String endLocation, String departureTime, String duration) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "INSERT INTO routes (route_id, start_location, end_location, departure_time, duration) VALUES (?, ?, ?, ?, ?)";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, routeId);
            pstmt.setString(2, startLocation);
            pstmt.setString(3, endLocation);
            pstmt.setString(4, departureTime);
            pstmt.setString(5, duration);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 删除线路信息
    public void deleteRoute(String routeId) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "DELETE FROM routes WHERE route_id=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, routeId);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 修改线路信息
    public void updateRoute(String routeId, String startLocation, String endLocation, String departureTime, String duration) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "UPDATE routes SET start_location=?, end_location=?, departure_time=?, duration=? WHERE route_id=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, startLocation);
            pstmt.setString(2, endLocation);
            pstmt.setString(3, departureTime);
            pstmt.setString(4, duration);
            pstmt.setString(5, routeId);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 查询线路信息
    public void queryRoute(String startLocation, String endLocation, String departureTime) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "SELECT * FROM routes WHERE start_location=? AND end_location=? AND departure_time=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, startLocation);
            pstmt.setString(2, endLocation);
            pstmt.setString(3, departureTime);
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                System.out.println(rs.getString("route_id") + " " + rs.getString("start_location") + " " + rs.getString("end_location") + " " + rs.getString("departure_time") + " " + rs.getString("duration"));
            }
            rs.close();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 添加汽车信息
    public void addCar(String carId, String carType, String price, String capacity) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "INSERT INTO cars (car_id, car_type, price, capacity) VALUES (?, ?, ?, ?)";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, carId);
            pstmt.setString(2, carType);
            pstmt.setString(3, price);
            pstmt.setString(4, capacity);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 删除汽车信息
    public void deleteCar(String carId) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "DELETE FROM cars WHERE car_id=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, carId);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 修改汽车信息
    public void updateCar(String carId, String carType, String price, String capacity) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "UPDATE cars SET car_type=?, price=?, capacity=? WHERE car_id=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, carType);
            pstmt.setString(2, price);
            pstmt.setString(3, capacity);
            pstmt.setString(4, carId);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 查询汽车信息
    public void queryCar(String carType) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "SELECT * FROM cars WHERE car_type=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, carType);
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                System.out.println(rs.getString("car_id") + " " + rs.getString("car_type") + " " + rs.getString("price") + " " + rs.getString("capacity"));
            }
            rs.close();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 添加票价信息
    public void addTicket(String ticketId, String routeId, String carId, String userId, String status, String price, String discount) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "INSERT INTO tickets (ticket_id, route_id, car_id, user_id, status, price, discount) VALUES (?, ?, ?, ?, ?, ?, ?)";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, ticketId);
            pstmt.setString(2, routeId);
            pstmt.setString(3, carId);
            pstmt.setString(4, userId);
            pstmt.setString(5, status);
            pstmt.setString(6, price);
            pstmt.setString(7, discount);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 删除票价信息
    public void deleteTicket(String ticketId) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "DELETE FROM tickets WHERE ticket_id=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, ticketId);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 修改票价信息
    public void updateTicket(String ticketId, String status, String price, String discount) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "UPDATE tickets SET status=?, price=?, discount=? WHERE ticket_id=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, status);
            pstmt.setString(2, price);
            pstmt.setString(3, discount);
            pstmt.setString(4, ticketId);
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 查询票价信息
    public void queryTicket(String userId) {
        try {
            Connection conn = DriverManager.getConnection(url, username, password);
            String sql = "SELECT * FROM tickets WHERE user_id=?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, userId);
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                System.out.println(rs.getString("ticket_id") + " " + rs.getString("route_id") + " " + rs.getString("car_id") + " " + rs.getString("user_id") + " " + rs.getString("status") + " " + rs.getString("price") + " " + rs.getString("discount"));
            }
            rs.close();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }