Retrieve Wordpress post with featured image/thumbnail in one sql query - php

Question

here's my code :
SELECT p.ID, p.post_title,
MAX(IF(pm.meta_key = 'featured_image', pm.meta_value, NULL)) AS event_imgID
FROM wpgp_posts AS p
LEFT JOIN wpgp_postmeta AS pm on pm.post_id = p.ID
WHERE p.post_type = 'product' and p.post_status = 'publish'
GROUP BY p.ID
event_imgID retrieve the ID from postmeta but the img url is stored in the wpgp_posts in the guid column
How to achieve this ?

Answer 1

You can join in the table to get more information about the image:
SELECT . . .
FROM (SELECT p.ID, p.post_title,
MAX(CASE WHEN pm.meta_key = 'featured_image' THEN pm.meta_value END) AS event_imgID
FROM wpgp_posts p LEFT JOIN
wpgp_postmeta pm
ON pm.post_id = p.ID
WHERE p.post_type = 'product' and p.post_status = 'publish'
GROUP BY p.ID
) pi LEFT JOIN
wpgp_posts wp
ON pi.event_imgID = wp.guid

Answer 2

I finally found the way to do it. I had to search thumbnail_id instead of guid :
SELECT
p1.ID, p1.post_title,
MAX(IF(pm.meta_key = 'listing_event_date', pm.meta_value, NULL)) AS event_date,
wm2.meta_value as event_img
FROM
wpgp_posts p1
LEFT JOIN wpgp_postmeta AS pm on (pm.post_id = p1.ID)
LEFT JOIN
wpgp_postmeta wm1
ON (
wm1.post_id = p1.id
AND wm1.meta_value IS NOT NULL
AND wm1.meta_key = '_thumbnail_id'
)
LEFT JOIN
wpgp_postmeta wm2
ON (
wm1.meta_value = wm2.post_id
AND wm2.meta_key = '_wp_attached_file'
AND wm2.meta_value IS NOT NULL
)
WHERE
p1.post_status='publish'
AND p1.post_type='product'
GROUP BY p1.ID, wm2.meta_id
ORDER BY
event_date ASC
Thanks