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

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;?>