function DBWrite(){
var address ='202.47.118.131:3306';
var user = "root";
var pwd="";
var db= "smsbrn";
var cform=FormApp.getActiveForm();
var formId=cform.getId();
var dbUrl='jdbc:mysql://' + address + '/' + db;

**var conn=Jdbc.getConnection(dbUrl, user, pwd);** //connection fails here.
var stmt=conn.prepareStatement('INSERT INTO smsbrndata(formID,username,pwd,sid,mobile)values(?, ?, ?, ?, ?)');
  stmt.setString(1,formId);
  stmt.setString(2,form.uname);
  stmt.setString(3,form.password);
  stmt.setString(4,form.sid);
  stmt.setString(5,form.mobile);
  stmt.execute();
 }