ddlScript_int(set_id, script, only_on_node) Processes the DDL_SCRIPT event. On slave nodes, this restores original triggers/rules, runs the script, and then puts tables back into replicated mode.
declare
p_set_id alias for $1;
p_script alias for $2;
p_only_on_node alias for $3;
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;
-- ----
-- Restore all original triggers and rules
-- ----
for v_row in select * from sl_table
where tab_set = p_set_id
loop
perform alterTableRestore(v_row.tab_id);
end loop;
-- ----
-- Run the script
-- ----
execute p_script;
-- ----
-- Put all tables back into replicated mode
-- ----
for v_row in select * from sl_table
where tab_set = p_set_id
loop
perform alterTableForReplication(v_row.tab_id);
end loop;
return p_set_id;
end;