anchor.diff:    List b = JSON.decode(decoded);//对客户端传过来的信息解码
     var Username = b[0];
     var Password = b[1];
  -  var pool = new ConnectionPool(host: '52.8.67.180',port: 3306, user: 'dec2013stu', password: 'dec2013stu', db: 'stu_10130340211', max: 5);
  +  var pool = new ConnectionPool(host: '52.193.39.90',port: 3306, user: 'dec2013stu', password: 'dec2013stu', db: 'stu_10130340211', max: 5);
     var results = await pool.query('SELECT * FROM user where studentID = "${Username}"and password ="${Password}" ');//查找匹配输入的用户信息
     await results.forEach((row) {
       print('${row.studentID},${row.password}');
  
positive.code: 
  
  postAddMessage( )async{//添加留言的函数
    var pool = new ConnectionPool(host: '52.8.67.180', port: 3306, user: 'dec2013stu', password: 'dec2013stu', db: 'stu_10130340211');
    //print('adding...');
    var curriculumID;
    print(decoded[3]);
  
negative.code: }
  
  getMyclass(HttpRequest request) async{   //获取我的课程列表
    var pool=new ConnectionPool(host: '52.193.39.90', port: 3306, user: 'dec2013stu', password: 'dec2013stu', db: 'stu_10130340211');
    var results = await pool.query('select curriculumname from curriculum where curriculumID in (select curriculumID from xuanke where studentID = "${stuID}")');
    var tearesults = await pool.query('select teachername from teacher where teacherID in(select teacherID from curriculum where curriculumID in (select curriculumID from xuanke where studentID = "${stuID}"))');
    //需把登陆页面获得的学号替换掉select里的101
  