在myeclipse里运行一个项目,是一个学员考勤系统的,有用户注册,登录登录,班级管理,学员管理..........报错内容是:com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?' at line 1,求大神指教!