com.mysql.jdbc.exceptions.MySQLSyntaxErrorException

刚才打Java代码出现了错误，百度了好多也没有解决掉，是更新数据库的错误，很急，求大神指教！！！

try {Jbuilder builder = new Jbuilder();conn = builder.Jbuilder();stmt2=conn.createStatement();
//          String sql3="select * from news";
//          rs3 = stmt2.executeQuery(sql3);String sql = "update news SET mima = ?  where zhanghao = ?";   //SQL语句ps = conn.prepareStatement(sql);ps.setString(1, T2.getText());                      这两个文本框中获取的文本内容ps.setString(2, T1.getText());ps.executeUpdate(sql);         //将sql语句上传至数据库执行         int res=ps.executeUpdate();if(res>0){System.out.println("更新数据成功");}ps.close();}catch(SQLException e1) {e1.printStackTrace();}

错误提示：
com.mysql.jdbc.exceptions.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 ‘? where zhanghao = ?’ at line 1

求大神！！！

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