6.22. altertableaddtriggers(integer)

Function Properties

Language: PLPGSQL

Return Type: integer

alterTableAddTriggers(tab_id) Adds the log and deny access triggers to a replicated table.

declare
	p_tab_id			alias for $1;
	v_no_id				int4;
	v_tab_row			record;
	v_tab_fqname		text;
	v_tab_attkind		text;
	v_n					int4;
	v_trec	record;
	v_tgbad	boolean;
begin
	-- ----
	-- Grab the central configuration lock
	-- ----
	lock table sl_config_lock;

	-- ----
	-- Get our local node ID
	-- ----
	v_no_id := getLocalNodeId('_schemadoc');

	-- ----
	-- Get the sl_table row and the current origin of the table. 
	-- ----
	select T.tab_reloid, T.tab_set, T.tab_idxname, 
			S.set_origin, PGX.indexrelid,
			slon_quote_brute(PGN.nspname) || '.' ||
			slon_quote_brute(PGC.relname) as tab_fqname
			into v_tab_row
			from sl_table T, sl_set S,
				"pg_catalog".pg_class PGC, "pg_catalog".pg_namespace PGN,
				"pg_catalog".pg_index PGX, "pg_catalog".pg_class PGXC
			where T.tab_id = p_tab_id
				and T.tab_set = S.set_id
				and T.tab_reloid = PGC.oid
				and PGC.relnamespace = PGN.oid
				and PGX.indrelid = T.tab_reloid
				and PGX.indexrelid = PGXC.oid
				and PGXC.relname = T.tab_idxname
				for update;
	if not found then
		raise exception 'Slony-I: alterTableAddTriggers(): Table with id % not found', p_tab_id;
	end if;
	v_tab_fqname = v_tab_row.tab_fqname;

	v_tab_attkind := determineAttKindUnique(v_tab_row.tab_fqname, 
						v_tab_row.tab_idxname);

	execute 'lock table ' || v_tab_fqname || ' in access exclusive mode';

	-- ----
	-- Create the log and the deny access triggers
	-- ----
	execute 'create trigger "_schemadoc_logtrigger"' || 
			' after insert or update or delete on ' ||
			v_tab_fqname || ' for each row execute procedure logTrigger (' ||
                               pg_catalog.quote_literal('_schemadoc') || ',' || 
				pg_catalog.quote_literal(p_tab_id::text) || ',' || 
				pg_catalog.quote_literal(v_tab_attkind) || ');';

	execute 'create trigger "_schemadoc_denyaccess" ' || 
			'before insert or update or delete on ' ||
			v_tab_fqname || ' for each row execute procedure ' ||
			'denyAccess (' || pg_catalog.quote_literal('_schemadoc') || ');';

	perform alterTableConfigureTriggers (p_tab_id);
	return p_tab_id;
end;