mysql - 替换行内的部分值

Question

我在 WordPress 中有一个数据库表，它是从 Movable Type CMS 导入的，所以它并不完美。

• 表:wp_posts
• 列:post_content

post_content 内部是整个博客文章，在某些情况下，它们包含带有 URL 的内嵌图像，例如:

    ...post content...<img src="http://url.com/images/image1.jpg"/>...content
    ...post content...<img src="http://url.com/image2.jpg"/>...content

我试图让所有网址都指向http://url.com/images/

目前我将此作为我的 SQL 查询，仅当路径不是 url.com/images 时才有效，它会变成 url.com/images/images/:

UPDATE wp_posts
SET post_content = REPLACE(post_content,'url.com','url.com/images')
WHERE post_content LIKE '%url.com%';

有什么方法可以运行单个查询并将所有必要的行更新为相同的值吗？

Answer 1

最简单的方法是将现有网址转换为其他内容，运行原始查询，然后将它们全部恢复。

此查询会将 url.com/images 的所有实例替换为 [PLACEHOLDER]。

UPDATE wp_posts
SET post_content = REPLACE(post_content,'url.com/images','[PLACEHOLDER]')
WHERE post_content LIKE '%url.com/images%';

现在运行原始查询以将 /images 附加到 url.com:

UPDATE wp_posts
SET post_content = REPLACE(post_content,'url.com','url.com/images')
WHERE post_content LIKE '%url.com%';

现在您可以将[PLACEHOLDER]向后移动:

UPDATE wp_posts
SET post_content = REPLACE(post_content,'[PLACEHOLDER]','url.com/images')
WHERE post_content LIKE '%[PLACEHOLDER]%';

全部集中在一起，方便复制和粘贴:

UPDATE wp_posts
SET post_content = REPLACE(post_content,'url.com/images','[PLACEHOLDER]')
WHERE post_content LIKE '%url.com/images%';
UPDATE wp_posts
SET post_content = REPLACE(post_content,'url.com','url.com/images')
WHERE post_content LIKE '%url.com%';
UPDATE wp_posts
SET post_content = REPLACE(post_content,'[PLACEHOLDER]','url.com/images')
WHERE post_content LIKE '%[PLACEHOLDER]%';