邮件特色图像链接存储在WordPress数据库中的哪个位置？

WordPress数据库中存储的精选图片链接在哪里？我在wp_postmeta桌子上搜索但我找不到确切的post_id和links.

它是否正确？有谁能请向我解释它是如何工作的？

特色图像ID wp_postmeta与meta_key被调用者一起存储_thumbnail_id.例:

?????????????????????????????????????????????????
? meta_id ? post_id ? meta_key      ? meta_value?
?????????????????????????????????????????????????
? 200     ? 4       ? _thumbnail_id ? 48        ?
?????????????????????????????????????????????????

然后,实际的缩略图链接包含在wp_postsa post_type中attachment.例:

?????????????????????????????????????????????????????????????????????????
? ID ? post_type  ? guid                                                ?
?????????????????????????????????????????????????????????????????????????
? 48 ? attachment ? http://example.com/wp-content/uploads/yourimage.png ?
?????????????????????????????????????????????????????????????????????????

我很好奇,所以这里......

该wp_postmeta表将举行与后一个条目meta_key的_thumbnail_id

这meta_value是post_id特色图片的孩子

使用它post_id,您可以从wp_posts和获取更多信息wp_postmeta

总而言之,这里是如何获取wp_posts帖子的特色图像的子行XXX...

SELECT childpost.* 
FROM wp_posts childpost 
INNER JOIN wp_postmeta parentmeta ON (childpost.ID=parentmeta.meta_value)
WHERE parentmeta.meta_key='_thumbnail_id' 
AND parentmeta.post_id=XXX;

这是同一图像的元数据

SELECT childmeta.* 
FROM wp_postmeta childmeta 
INNER JOIN wp_postmeta parentmeta ON (childmeta.post_id=parentmeta.meta_value)
WHERE parentmeta.meta_key='_thumbnail_id' 
AND parentmeta.post_id=XXX;

元数据将包含_wp_attached_file相对路径,并_wp_attachment_metadata包含一些PHP序列化数据.

这里我的sql与完整的URL图像

SELECT concat((select option_value from wp_options where option_name ='siteurl'  limit 1),'/wp-content/uploads/',childmeta.meta_value)
FROM wp_postmeta childmeta 
INNER JOIN wp_postmeta parentmeta ON (childmeta.post_id=parentmeta.meta_value)
WHERE parentmeta.meta_key='_thumbnail_id' and childmeta.meta_key = '_wp_attached_file'
AND parentmeta.post_id = POST_ID ;

select option_name from wp_options where option_name ='siteurl' 

结果将是这样的

http://yourdomain/blog-wp/wp-content/uploads/2015/04/IMG_06062014_155904.png

即使rnevius的答案看起来是正确的,结果也会返回一些带有这种URL的图片:http://www.example.com/？attach_ment = 48,这 在我的情况下不起作用.

在Wordpress 4.9.3上测试:

另一种解决方案是使用_wp_attached_file:

wp_postmeta

搜索值_thumbnail_id的meta_key

meta_id   | post_id   | meta_key            | meta_value
200       | 4         | _thumbnail_id       | 48

wp_postmeta

再次wp_postmeta,寻找价值_wp_attached_file在meta_key哪里post_id是匹配的meta_value以前的查询发现

meta_id   | post_id   | meta_key            | meta_value
1020      | 48        | _wp_attached_file   | 2018/09/picture.jpg

查询:

SELECT wp.ID, wpm2.meta_value
FROM wp_posts wp
    INNER JOIN wp_postmeta wpm
        ON (wp.ID = wpm.post_id AND wpm.meta_key = '_thumbnail_id')
    INNER JOIN wp_postmeta wpm2
        ON (wpm.meta_value = wpm2.post_id AND wpm2.meta_key = '_wp_attached_file')