SQL批量提取帝国CMS内容第一张图为标题图的方法

UPDATE phome_ecms_news
JOIN phome_ecms_news_data_1
ON phome_ecms_news.id = phome_ecms_news_data_1.id
SET    phome_ecms_news.titlepic = (select reverse(substring(reverse(substring_index(substring(newstext,locate('src=',newstext)+6),'"',1)),2,255)) from phome_ecms_news_data_1 where id=phome_ecms_news.id)
WHERE phome_ecms_news.titlepic='';

UPDATE phome_ecms_news SET ispic=1 WHERE titlepic<>'';