varchar2转blob 问题

 INSERT INTO jforum_posts_text
                                 (post_id, post_text, post_subject)
                               VALUES
                                 (JFORUM_POSTS_SEQ.CURRVAL, UTL_RAW.CAST_TO_RAW (REVERT_CONTENT1), forum_name);REVERT_CONTENT1 为varchar2   
post_text 为 blob 
能转换成功,但为乱码