-- -- acs_message_update_tr/0 -- create or replace function acs_message_update_tr( ) returns trigger as $$ declare v_parent_sk varbit default null; v_max_value integer; v_rec record; clr_keys_p boolean default 't'; begin if new.message_id = old.message_id and ((new.reply_to = old.reply_to) or (new.reply_to is null and old.reply_to is null)) then return new; end if; for v_rec in select message_id, reply_to from acs_messages where tree_sortkey between new.tree_sortkey and tree_right(new.tree_sortkey) order by tree_sortkey LOOP if clr_keys_p then update acs_messages set tree_sortkey = null where tree_sortkey between new.tree_sortkey and tree_right(new.tree_sortkey); clr_keys_p := 'f'; end if; select max(tree_leaf_key_to_int(tree_sortkey)) into v_max_value from acs_messages where reply_to = v_rec.reply_to; select tree_sortkey into v_parent_sk from acs_messages where message_id = v_rec.reply_to; update acs_messages set tree_sortkey = tree_next_key(v_parent_sk, v_max_value) where message_id = v_rec.message_id; end LOOP; return new; end;$$ language plpgsql;