WordPress MU

Hi,

does anyone tried to pull out from DB all categories from all blogs?
Everything else is quite simple, but because of taxonomy, I'm having hard times with categories.

Best regards,
A.

Manage to think of something. Here's the idea:

get all 'safe-to-show' blogs

$blogs = $wpdb->get_col("SELECT blog_id FROM $wpdb->blogs WHERE
public = '1' AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0'");

get all info on a post - along with categories

foreach ($blogs as $blog){
$post = $wpdb->get_results("SELECT * FROM wp_{$blog}_options
LEFT JOIN wp_{$blog}_term_relationships ON
(wp_{$blog}_posts.ID = wp_{$blog}_term_relationships.object_id)
LEFT JOIN wp_{$blog}_term_taxonomy ON
(wp_{$blog}_term_relationships.term_taxonomy_id = wp_{$blog}_term_taxonomy.term_taxonomy_id)
LEFT JOIN wp_{$blog}_terms ON
(wp_{$blog}_term_taxonomy.term_id = wp_{$blog}_terms.term_id)
WHERE wp_{$blog}_posts.post_status = 'publish'
AND wp_{$blog}_term_taxonomy.taxonomy = 'category'
ORDER BY post_date DESC");
}

Now to put it in a nice loop. Should post when I'm done (err, any ideas? ;)
Btw: you call for a 'category' by
echo $post->name

Ok, so for sure there was an easier way to do this (calling 'the_category()' function and so on instead of creating new 'post' query to the database, but I want to manipulate the data of every post in every blog to create dynamic sidemenu displaying the links to other articles/blogs according to the post content (sth like adsense but within the MU). Therefore I need maximum control and better handling of the code ;)

Anyway, here's the code:

$beforeBlock = "";
$afterBlock = "<br><br>";       

global $wpdb;
$blogs = $wpdb->get_col("SELECT blog_id FROM $wpdb->blogs WHERE
	public = '1' AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0'
	ORDER BY last_updated DESC");

if ($blogs) {
	foreach ($blogs as $blog) {
		$options = $wpdb->get_results("SELECT option_value FROM
			wp_{$blog}_options WHERE option_name IN ('siteurl','blogname')
			ORDER BY option_name DESC");
		$posts = $wpdb->get_results("SELECT * FROM wp_{$blog}_posts
			LEFT JOIN wp_{$blog}_term_relationships ON
			(wp_{$blog}_posts.ID = wp_{$blog}_term_relationships.object_id)
			LEFT JOIN wp_{$blog}_term_taxonomy ON
			(wp_{$blog}_term_relationships.term_taxonomy_id = wp_{$blog}_term_taxonomy.term_taxonomy_id)
			LEFT JOIN wp_{$blog}_terms ON
			(wp_{$blog}_term_taxonomy.term_id = wp_{$blog}_terms.term_id)
			WHERE wp_{$blog}_posts.post_status = 'publish'
			AND wp_{$blog}_term_taxonomy.taxonomy = 'category'
			ORDER BY post_date DESC");	

		if($post) {
			foreach($posts as $post) {
				//display only to show that it's working ;>
				echo $beforeBlock.
				'<a href="'.$post->guid.'">'.$post->post_title.'</a><br/>
				by <a href="'.$options[0]->option_value.'">'.$options[1]->option_value.'</a>
				in '.$post->name
				.$afterBlock;
			}
		}
	}
}