public String update() throws SQLException, NullPointerException {
int result = 0;
String flag = INPUT;
if (null != user)
try {
result = userService.update(user);
} catch (InvalidInputException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (result > 0) flag = "list";
else if (result == 0) flag = INPUT;
else flag = ERROR;
return flag;
}
