zlfen / collegestudy Goto Github PK

    return result;
}

/**
 * 实现界面初始化
 * @return 用户用户名和密码
 */
private static Map<String, String> initUI() {

    Scanner scanner = new Scanner(System.in);

    System.out.println("用户名");
    String LoginName = scanner.nextLine();

    System.out.println("密码");
    String LoginPwd = scanner.nextLine();

    Map<String,String> userLoginInfo = new HashMap<>();
    userLoginInfo.put("LoginName",LoginName);
    userLoginInfo.put("LoginPwd",LoginPwd);

    return userLoginInfo;
}

}

/**
 * 验证用户名和密码
 * @param userLoginInfo 用户名和密码
 * @return true成功  false失败
 */
private static boolean Login(Map<String, String> userLoginInfo) {
    //初始化
    Boolean result = false;
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;
    PreparedStatement ps = null;  //预编译的数据库操作对象

    String LoginName = userLoginInfo.get("LoginName");
    String LoginPwd = userLoginInfo.get("LoginPwd");

    try {
        //1.注册驱动
        Class.forName("com.mysql.cj.jdbc.Driver");
        //2.获取链接
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/studentsdb","root","root");
        //3.获取数据库操作对象
        //  ？为占位符
        String sql = "select * from t_user where Sname = ? and  Spwd =  ?";
        //  发送sql语句给DBMS，然后对sql语句进行预先编译
        ps = conn.prepareStatement(sql);
        ps.setString(1,LoginName);
        ps.setString(2,LoginPwd);
        //4.执行sql语句
        rs = ps.executeQuery();
        //5.处理结果集
        if(rs.next()){
            result = true;

        }
    } catch (Exception e) {
        e.printStackTrace();
    }finally {
        //6.释放资源
        if(rs != null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn != null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(stmt != null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    return result;
}

/**
 * 实现界面初始化
 * @return 用户用户名和密码
 */
private static Map<String, String> initUI() {

    Scanner scanner = new Scanner(System.in);

    System.out.println("用户名");
    String LoginName = scanner.nextLine();

    System.out.println("密码");
    String LoginPwd = scanner.nextLine();

    Map<String,String> userLoginInfo = new HashMap<>();
    userLoginInfo.put("LoginName",LoginName);
    userLoginInfo.put("LoginPwd",LoginPwd);

    return userLoginInfo;
}

    try {
        //注册驱动
        Class.forName("com.mysql.cj.jdbc.Driver");
        //2.获取连接
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/studentsdb",
                "root","root");
        //将自动提交关闭
        conn.setAutoCommit(false);
        //3.获取预编译sql操作对象
        String sql = "update t_user set Sname = ? where Sno = ?";
        ps = conn.prepareStatement(sql);
        //事件1
        ps.setString(1,"zzj");
        ps.setString(2,"004");
        int count = ps.executeUpdate();
        //事件2
        ps.setString(1,"ppp");
        ps.setString(2,"005");
        count += ps.executeUpdate();

        System.out.println( count==2 ? "修改成功":"修改失败");
        //手动提交
        conn.commit();
    } catch (Exception e) {
        //事务回滚
        if(conn!=null){
            try {
                conn.rollback();
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
        }
        e.printStackTrace();
    }finally {
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(ps!=null){
            try {
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }


    }
}