select source_id, owner_id, feed_url, last_modified from na_sources
update na_items set link = :link, title = :title, description = :description, creation_date = now() where item_id = :item_id
select 1 from na_sources where owner_id = :owner_id AND feed_url =:feed_url
update na_sources set link = :link, title = :title, description = :description, updates = (updates + 1), last_scanned = sysdate, last_modified = :last_modified where source_id = :source_id