Discuz 修改帖子内容
UPDATE `cdb_posts` SET `message` = REPLACE(`message`,'需要替换字串','替换之后的字串');

Ecms 修改标题
UPDATE `phome_ecms_news` SET `title` = REPLACE(`title`,'替换前字串','替换之后的字串');
修改摘要
UPDATE `phome_ecms_news` SET `smalltext` = REPLACE(`smalltext`,'替换前字串','替换之后的字串');
修改内容
UPDATE `phome_ecms_news_data_1` SET `newstext ` = REPLACE(`newstext`,'需要替换字串','替换之后的字串');