个人作业6
完善优化了打卡功能,加入了自动记录时间和日期判断功能,方便用户记录学习时间,且用户一天只能打卡一次,避免重复打卡,优化用户体验
public int panduan(){ Connection conn = null; Statement stmt = null; try { // 连接数据库 conn = JDBCUtils.getConn(); // 获取今天的日期 LocalDate today = null; if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) { today = LocalDate.now(); } // 创建 Statement 对象 stmt = conn.createStatement(); // 用户ID(假设用户ID为123) int userId = 123; // 执行 SQL 查询,检查用户今天是否已经打过卡 String sqlCheck = "SELECT * FROM daka WHERE riqi = '" + today + "'"; ResultSet rs = stmt.executeQuery(sqlCheck); // 如果查询结果不为空,则表示用户今天已经打过卡,否则允许用户进行打卡 if (rs.next()) { System.out.println("今天已经打过卡了!"); return 0; } // 关闭连接 rs.close(); stmt.close(); conn.close(); } catch (SQLException se) { // 处理 SQL 异常 se.printStackTrace(); } catch (Exception e) { // 处理其他异常 e.printStackTrace(); } finally { // 关闭资源 try { if (stmt != null) stmt.close(); } catch (SQLException se2) { } try { if (conn != null) conn.close(); } catch (SQLException se) { se.printStackTrace(); } } return 1; }

public void daka(View view) { new Thread() { @Override public void run() { UserDao userDao = new UserDao(); int msg = userDao.panduan(); hand1.sendEmptyMessage(msg); } }.start(); } @SuppressLint("HandlerLeak") final Handler hand1 = new Handler() { @Override public void handleMessage(Message msg) { if (msg.what == 0){ Toast.makeText(getApplicationContext(), "今日已打卡,请勿重复打卡", Toast.LENGTH_LONG).show(); } else if (msg.what == 1) { Intent intent = new Intent(aaa0.this, today.class); startActivity(intent); } } };

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