Bagaimana untuk membangunkan platform temu janji hospital dalam talian yang mudah menggunakan MySQL dan Java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DatabaseUtil {
    private static final String URL = "jdbc:mysql://localhost:3306/hospital";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "password";

    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(URL, USERNAME, PASSWORD);
    }
}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class HospitalDao {
    public List<Hospital> getAllHospitals() {
        List<Hospital> hospitals = new ArrayList<>();
        String sql = "SELECT * FROM hospital";
        try (Connection connection = DatabaseUtil.getConnection();
             PreparedStatement statement = connection.prepareStatement(sql);
             ResultSet resultSet = statement.executeQuery()) {
            while (resultSet.next()) {
                Hospital hospital = new Hospital();
                hospital.setId(resultSet.getInt("id"));
                hospital.setName(resultSet.getString("name"));
                hospital.setAddress(resultSet.getString("address"));
                hospital.setPhone(resultSet.getString("phone"));
                hospitals.add(hospital);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return hospitals;
    }

    public List<Department> getDepartmentsByHospitalId(int hospitalId) {
        List<Department> departments = new ArrayList<>();
        String sql = "SELECT * FROM department WHERE hospital_id = ?";
        try (Connection connection = DatabaseUtil.getConnection();
             PreparedStatement statement = connection.prepareStatement(sql)) {
            statement.setInt(1, hospitalId);
            try (ResultSet resultSet = statement.executeQuery()) {
                while (resultSet.next()) {
                    Department department = new Department();
                    department.setId(resultSet.getInt("id"));
                    department.setHospitalId(hospitalId);
                    department.setName(resultSet.getString("name"));
                    departments.add(department);
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return departments;
    }
}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DoctorDao {
    public List<Doctor> getDoctorsByDepartmentId(int departmentId) {
        List<Doctor> doctors = new ArrayList<>();
        String sql = "SELECT * FROM doctor WHERE department_id = ?";
        try (Connection connection = DatabaseUtil.getConnection();
             PreparedStatement statement = connection.prepareStatement(sql)) {
            statement.setInt(1, departmentId);
            try (ResultSet resultSet = statement.executeQuery()) {
                while (resultSet.next()) {
                    Doctor doctor = new Doctor();
                    doctor.setId(resultSet.getInt("id"));
                    doctor.setDepartmentId(departmentId);
                    doctor.setName(resultSet.getString("name"));
                    doctor.setTitle(resultSet.getString("title"));
                    doctor.setIntroduction(resultSet.getString("introduction"));
                    doctors.add(doctor);
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return doctors;
    }
}