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                        /通过自动回复机器人学Mybatis---基础版

按照教程操作到2-6，代码和教程的一样，软件也一样，出不来，控制台报错，意思是说我的sql代码有问题，可是，我是完全抄的教程啊。我把代码贴出来。请大佬指点一下。

List<String> paramList = new ArrayList<String>();
           if (command != null && !"".equals(command.trim())) {
               sql.append("and COMMAND=?");
               paramList.add(command);
           }
           if (description != null && !"".equals(description.trim())) {
               sql.append("and DESCRIPTION like '%'?'%'");
               paramList.add(description);
           }

           PreparedStatement statement = conn.prepareStatement(sql.toString());

           for (int i = 0; i < paramList.size(); i++) {
               statement.setString(i + 1, paramList.get(i));
           }

           ResultSet rs = statement.executeQuery();

控制台报错如下：

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 'COMMAND='??????'and DESCRIPTION like '%''??????''%'' at line 1