Mass Delete and Publish drafts

hi,
I’m wordking on mass drafts control plugin..
I have some questions:
to delete draft i’ve to delete it from posts,post2cat,comments,postmeta

to publish draft i’ll use this SQL query:

$post_name = sanitize_title_with_dashes($title);
-----------SQL START------------
UPDATE $wpdb->posts ".
"SET post_date = '$now', post_date_gmt = '$now_gmt',post_name = '$post_name' ".
", post_modified = '$now' , post_modified_gmt = '$now_gmt', post_status = 'publish' ".
" WHERE <<here i'll put drafts id>>";
-----------SQL END------------

IS the above right or has a problems?
Thank you in advance..