Java를 활용하여 온라인 시험 시스템의 시험 배치 조정 기능 구현

public class ExamManagement {
    // 查询考试信息
    public List<Exam> queryExams() {
        List<Exam> exams = new ArrayList<>();
        
        // 连接数据库，执行查询语句
        try(Connection conn = DriverManager.getConnection(url, username, password);
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM exam")) {
            
            // 遍历查询结果集，将考试信息存储到List中
            while(rs.next()) {
                Exam exam = new Exam();
                
                exam.setId(rs.getInt("exam_id"));
                exam.setCourseId(rs.getInt("course_id"));
                exam.setStartTime(rs.getTimestamp("start_time"));
                exam.setEndTime(rs.getTimestamp("end_time"));
                exam.setRoomId(rs.getInt("room_id"));
                // ...
                
                exams.add(exam);
            }
            
        } catch(SQLException e) {
            e.printStackTrace();
        }
        
        return exams;
    }
}

public class ExamManagement {
    // 调整考试信息
    public void adjustExam(int examId, Date startTime, Date endTime, int roomId) {
        // 连接数据库，执行更新语句
        try(Connection conn = DriverManager.getConnection(url, username, password);
            PreparedStatement pstmt = conn.prepareStatement("UPDATE exam SET start_time=?, end_time=?, room_id=? WHERE exam_id=?")) {
            
            pstmt.setTimestamp(1, new Timestamp(startTime.getTime()));
            pstmt.setTimestamp(2, new Timestamp(endTime.getTime()));
            pstmt.setInt(3, roomId);
            pstmt.setInt(4, examId);
            
            pstmt.executeUpdate();
            
        } catch(SQLException e) {
            e.printStackTrace();
        }
    }
}