Retrieve wordpress posts with featured image via SQL - php

Question

I'm using this query in a PHP script outside Wordpress to retrieve entries with their featured images
SELECT ( SELECT guid FROM wp_posts WHERE id = m.meta_value ) AS url
FROM wp_posts p, wp_postmeta m
WHERE p.post_type = 'post'
AND p.post_status = 'publish'
AND p.id = m.post_id
AND m.meta_key = '_thumbnail_id'
...and it works fine.
But this way I get full-size image URL. I need to retrieve 'medium' or 'thumbnail' sizes of these images.
¿Any way to achieve this?

Answer 1

here is the response :
SELECT TITRE,DESCR,URL, CONCAT(LEFT(IMG, LENGTH(IMG) - LOCATE('.',
REVERSE(IMG))),'-150x150.',SUBSTRING_INDEX(IMG, '.', -1)) AS IMG FROM (
SELECT
p.`post_title` AS TITRE,
(SELECT `meta_value` FROM wp_postmeta WHERE `post_id` = p.`ID` and `meta_key`='_yoast_wpseo_metadesc') AS DESCR,
p.`guid` AS URL,
(SELECT `guid` FROM wp_posts WHERE id = m.meta_value) AS IMG
FROM wp_posts p, wp_postmeta m
WHERE p.post_type = 'post'
AND p.post_status = 'publish'
AND p.id = m.post_id
AND m.meta_key = '_thumbnail_id') TT
where DESCR is not null

Answer 2

The following query, adapted from the above, solved my particular problem which was simply to grab the last four posts and their featured images. Plus the post_name from which I could construct a pretty URL
SELECT title, post_name, date, content, CONCAT(LEFT(image, LENGTH(image) - LOCATE('.', REVERSE(image))),'-150x150.',SUBSTRING_INDEX(image, '.', -1)) AS image
FROM (
SELECT
p.post_title AS title,
p.post_status AS 'status',
p.post_date AS date,
p.post_content AS content,
p.post_name AS post_name,
(SELECT `guid` FROM wp_posts WHERE id = m.meta_value) AS image
FROM wp_posts p, wp_postmeta m
WHERE p.post_type = 'post'
AND p.post_status = 'publish'
AND p.id = m.post_id
AND m.meta_key = '_thumbnail_id'
ORDER BY date DESC
LIMIT 4
) TT
Of course from there it's easy to make an excerpt etc using:
for($i=0; $i< $num_rows; $i++){
$post_content = mysql_result($query_result, $i, "content");
$post_excerpt = substr($post_content, 0, 90);
$post_permalink = $post_url . mysql_result($query_result, $i, "post_name");
echo $post_permalink; //etc
}

Answer 3

You can try this query for thumbnail size , for medium image i am not sure about the right size if you know the dimension then make custom alias as i made below using the SUBSTRING_INDEX to get the extension of file then i have used CONCAT function with the post_name column and the dimensions + extension ,similarly you can do this for medium size , As all upload goes to the upload folder you can analyze the generated thumbs name are original attachment name + -150x150 or other dimensions so from this logic your thumbs get the name with the dimensions, the attachments of post are stored in post_meta with the post id and having key name _wp_attachment_metadata which stores all the information about different sizes of file but in a serialized form so in mysql query you cannot unserialize the data
SELECT
CONCAT(p.`post_name` ,'-150x150.',
SUBSTRING_INDEX(( SELECT `guid` FROM wp_posts WHERE id = m.meta_value ), '.', -1) )
AS `thumbnail`,
(SELECT guid FROM wp_posts WHERE id = m.meta_value ) AS `full`
FROM wp_posts p, wp_postmeta m
WHERE p.post_type = 'post'
AND p.post_status = 'publish'
AND p.id = m.post_id
AND m.meta_key = '_thumbnail_id'
This query works for me to get thumbnail of size 150*150 hope it works for you also

Answer 4

SELECT
p.ID,
p.post_title AS title,
p.post_name AS post_name,
(SELECT meta_value from wp_postmeta where post_id = m.meta_value and meta_key='_wp_attachment_metadata') AS meta_value
FROM
wp_posts p,
wp_postmeta m
WHERE
p.post_type = 'post'
AND p.post_status = 'publish'
AND p.id = m.post_id
AND m.meta_key = '_thumbnail_id'
ORDER BY
p.post_date DESC
LIMIT 5;
And then use unserialize PHP function with meta_value