abc/ScoreService.java

//package service;

import dao.ScoreDAO;
import entity.Score;

/**
 * ScoreService：处理成绩相关业务逻辑
 */
public class ScoreService {
    private ScoreDAO scoreDAO = new ScoreDAO();

    // 添加成绩
    public boolean addScore(Score score) {
        // 检查是否已有成绩记录
        if (scoreDAO.getScore(score.getStudentId(), score.getCourseId()) != null) {
            return false;
        }
        return scoreDAO.addScore(score);
    }

    // 更新成绩
    public boolean updateScore(Score score) {
        return scoreDAO.updateScore(score);
    }

    // 删除成绩记录
    public boolean deleteScore(String studentId, String courseId) {
        return scoreDAO.deleteScore(studentId, courseId);
    }

    // 按学号和课程号获取成绩
    public Score getScore(String studentId, String courseId) {
        return scoreDAO.getScore(studentId, courseId);
    }

    // 获取某学生的所有成绩
    public java.util.List<Score> getScoresByStudent(String studentId) {
        return scoreDAO.getScoresByStudent(studentId);
    }

    // 获取所有成绩
    public java.util.List<Score> getAllScores() {
        return scoreDAO.getAllScores();
    }
}