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I've queried all children of the post, and two records are shown. This is ok because there are 2 images in the gallery, but I can see no field in the database which makes it clear which one is the featured image.

I have joined the wp_postmeta table also, but there is no meta_key which indicates which of the 2 is the featured image.

Note: I do not want to look in the admin panel, I need a programmatic way to determine from the current database setup.

Does anyone know how the system knows which is the featured image in the db?

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Look at how get_post_thumbnail_id() pulls data on post thumbnails, that should give you some clues.. – t31os Aug 11 '11 at 16:26
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This is the solution - apparently there is a record in the postmeta table which registers the thumbnail ID against the post id, so post_id = 'XX' and meta_key is '_thumbnail_id' – Ash Aug 11 '11 at 16:55

1 Answer

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this comes down to a simple one line and there is no need to get all of the children using: 

$featured image_id = get_post_meta( $post_id, '_thumbnail_id', true );
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Why not just use get_post_thumbnail_id( $post->ID )? – Chip Bennett Aug 11 '11 at 20:11
@Chip: You could, its basically a wrapper for the get_post_meta i posted with validation for the post id. If you look at the code here you will see that its the same. – Bainternet♦ Aug 11 '11 at 21:41
true, but I think it might be a bit easier to understand. :) In any case, +1 for the one-line-of-code solution! – Chip Bennett Aug 12 '11 at 1:36
My question was asking where is this listed in the database. As such the first answer gave me the solution – Ash Aug 16 '11 at 12:09
its listed in the postmeta table under meta_key named _thumbnail_id for each post – Bainternet♦ Aug 16 '11 at 14:05

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