public int reply(BlogMsg msg, int fatherId) {
        // 创建数据库连接对象：
        try{

             //这里是与数据库的连接，并且确定是对的，然后：

        Statement stmt = null;
        ResultSet rs = null;
//        try {
            int maxid = 1;
            String sql = "use blog select max(msg_ID) as maxid from blogmsg";
            // 创建数据记录集对象：
            stmt = con.createStatement();
            rs = stmt.executeQuery(sql);
            if (rs.next()) {
                maxid = rs.getInt(1) + 1;
            }
            // sql语句：
            sql = "use blog insert into blogmsg(author,msg_content,"
                    + "msg_date,is_origional,fathers_id,msg_replynum,browsed_times,"
                    + "latest_replication_id) values('"
                    + msg.getauthor()
                    + "','"
                    + msg.getmsg_content()
                    + "','"
                    + msg.getStrmsg_date()
                    + "','1','"
                    + fatherId
                    + "','0','0','" + maxid + "')";
            sql = new String(sql.getBytes("ISO8859-1"), "UTF-8");
            stmt.addBatch(sql);
            sql = "use blog update blogmsg set msg_replynum=msg_replynum+1,latest_replication_id='"
                    + maxid + "' where msg_ID='" + fatherId + "'";
            stmt.addBatch(sql);
            // 执行sql语句：
            stmt.executeBatch();
            return 1;
        } catch (SQLException sqlExc) {
            sqlExc.printStackTrace();
            return -1;
        } catch (Exception e) {
            e.printStackTrace();
            return -2;
        }

我想问一下，这段代码正确执行，就是正确的插入数据库然后更新相关信息，那它是应该返回1，但是我返回的好像是null，搞了几天了还是不知道为什么？？？？？？
重点看下红色部分，是不是有错。真是愁人呐。。。。