8.44. ddlscript_prepare_int(integer, integer)

    declare
    	p_set_id			alias for $1;
    	p_only_on_node		alias for $2;
    	v_set_origin		int4;
    	v_no_id				int4;
    	v_row				record;
    begin
    	-- ----
    	-- Grab the central configuration lock
    	-- ----
    	lock table sl_config_lock;
    
    	-- ----
    	-- Check that we either are the set origin or a current
    	-- subscriber of the set.
    	-- ----
    	v_no_id := getLocalNodeId('_schemadoc');
    	select set_origin into v_set_origin
    			from sl_set
    			where set_id = p_set_id
    			for update;
    	if not found then
    		raise exception 'Slony-I: set % not found', p_set_id;
    	end if;
    	if v_set_origin <> v_no_id
    			and not exists (select 1 from sl_subscribe
    						where sub_set = p_set_id
    						and sub_receiver = v_no_id)
    	then
    		return 0;
    	end if;
    
    	-- ----
    	-- If execution on only one node is requested, check that
    	-- we are that node.
    	-- ----
    	if p_only_on_node > 0 and p_only_on_node <> v_no_id then
    		return 0;
    	end if;
    
    	return p_set_id;
    end;