jsp查询数据库时出现乱码


编码方式一致，为什么还会出现下面的错误？
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

在以id查询时，却不会出现错误，并且中文也可以正常输出