How to manually query posts title, content and image attachment thumbnail? - mysql

Question

I am trying to manually query from an external php file the wordpress database and I want to extract the last 3 posts with: title, content, last (or first) image, and for that image, from wp_postmeta I want to get the thumbnail url.
I managed to get the title, content, image id, but I couldn't figure it out how to add another join for getting image thumbnail. This is what I have:
SELECT a.post_title title, max(c.guid) img_url, a.ID id
FROM wp_posts a
LEFT JOIN
(select post_parent, max(post_date_gmt) as latest_image_date from wp_posts
where post_type='attachment' GROUP BY post_parent) b
on a.id=b.post_parent
LEFT JOIN wp_posts c
on c.post_parent=a.id
and c.post_type='attachment'
and b.latest_image_date = c.post_date_gmt where c.guid IS NOT NULL
GROUP BY a.post_title ORDER BY a.ID
The image thumbnail is in wp_postmeta (meta_id, post_id, meta_key, meta_value) table, looking like this: 58435, 6711, _wp_attachment_metadata, a:6:{s:5:"width";s:4:"1024";s:6:"height";s:3:"683"...
I could see I get the image id in c.id and all it needs is another JOIN to also get data from wp_postmeta for the field where meta_key="_wp_attachment_metadata" and post_id=c.id.
Can anyone help me with completing the query? Thanks!

Answer 1

I know this is an old post, but here to help future answer seekers
Update the query as needed. This current query will select post that have attachments. It returns the attachment ID and guid, the post ID and title along with the category name and term_id.
SELECT DISTINCT p.ID,p.post_title, a.ID as attach_id, a.guid, t.name, t.term_id FROM $wpdb->posts as a
LEFT JOIN $wpdb->posts as p on p.ID = a.post_parent
AND a.post_type = 'attachment' AND a.post_mime_type = 'image/png'
JOIN $wpdb->term_relationships as tr on tr.object_id = p.ID
JOIN $wpdb->terms as t on t.term_id = tr.term_taxonomy_id
JOIN $wpdb->term_taxonomy as tt on tt.term_id = t.term_id
AND tt.taxonomy = 'category'
AND p.post_type = 'post'
AND p.post_status = 'publish';

Answer 2

You should save your time and use wordpress functions :
make a plugin
or include wp-load.php in your script
https://wordpress.stackexchange.com/questions/47049/what-is-the-correct-way-to-use-wordpress-functions-outside-wordpress-files

Answer 3

In the end I chose another solution (at least temporary) because it adds horizontal capabilities: I created a completely empty custom page (I had to manually remove some actions/filters to get it empty) in the other site (the one to be included) which exports data in json format. I get that data and print it as I need in the current site.
<?php
$args= array(
'posts_per_page' => 6
//if there are sticked posts they will also appear beside the 2 if we run this in a separate php file, not included in theme
);
$ii = 0;
query_posts($args);
if( have_posts() ) :
while ( have_posts() ) : the_post();
$permalink = get_permalink();
$titlu = get_the_title();
$excerpt = get_the_excerpt();
$args = array(
'post_type' => 'attachment',
'post_parent' => $post->ID,
'post_status' => 'inherit',
'numberposts' => 1
);
$images = get_posts($args);
$j = 1;
foreach ($images as $i) :
$ii++;//am preluat doar o poza, e ok numaratoarea
$j++;
$poza_thumb = wp_get_attachment_image_src($i->ID, 'thumbnail');
$arr[$ii] = array('titlu' => $titlu, 'url' => $permalink, 'poza_thumb' => "".$poza_thumb[0], 'poza_width' => "".$poza_thumb[1], 'poza_height' => "". $poza_thumb[2], 'articol' => $excerpt);
endforeach;
endwhile;
echo json_encode($arr);//we send json as array
else :
endif;?>