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: 
  }
  getAllclass(HttpRequest request) async{   //获取所有课程列表
    var pool=new ConnectionPool(host: '52.8.67.180', port: 3306, user: 'dec2013stu', password: 'dec2013stu', db: 'stu_10130340211');
    var results = await pool.query('select curriculumname from curriculum');
    var tearesults = await pool.query('select teachername from teacher where teacherID in(select teacherID from curriculum)');
    print('connect2!');
  
negative.code: getMessage(HttpRequest request) async {//获取所有留言
    var curriName = JSON.decode(decoded);//对客户端传过来的信息解码
    print(curriName);
    var pool=new ConnectionPool(host: '52.193.39.90', port: 3306, user: 'dec2013stu', password: 'dec2013stu', db: 'stu_10130340211');
    //var resultsMes = await pool.query('select time,comment,supportnumber,commentID from comment order by commentID desc where curriculumID = "${curriID}")');
    var resultsMes = await pool.query('select time,comment,supportnumber,commentID from comment where curriculumID in(select curriculumID from curriculum where curriculumname = "${curriName}") order by commentID desc');
    await resultsMes.forEach((row) {
  