1.24. altertablerestore( integer )

Function Properties

Language: PLPGSQL

Return Type: integer

alterTableRestore (tab_id) Restores table tab_id from being replicated. On the origin, this simply involves dropping the "logtrigger" trigger. On subscriber nodes, this involves dropping the "denyaccess" trigger, and restoring user triggers and rules.

declare
	p_tab_id			alias for $1;
	v_no_id				int4;
	v_tab_row			record;
	v_tab_fqname		text;
	v_n					int4;
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 tables origin. Check
	-- that the table currently IS in altered state.
	-- ----
	select T.tab_reloid, T.tab_set, T.tab_altered,
			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: alterTableRestore(): Table with id % not found', p_tab_id;
	end if;
	v_tab_fqname = v_tab_row.tab_fqname;
	if not v_tab_row.tab_altered then
		raise exception 'Slony-I: alterTableRestore(): Table % is not in altered state',
				v_tab_fqname;
	end if;

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

	-- ----
	-- Procedures are different on origin and subscriber
	-- ----
	if v_no_id = v_tab_row.set_origin then
		-- ----
		-- On the Origin we just drop the trigger we originally added
		-- ----
		execute 'drop trigger "_schemadoc_logtrigger_' || 
				p_tab_id || '" on ' || v_tab_fqname;
	else
		-- ----
		-- On the subscriber drop the denyAccess trigger
		-- ----
		execute 'drop trigger "_schemadoc_denyaccess_' || 
				p_tab_id || '" on ' || v_tab_fqname;
				
		-- ----
		-- Restore all original triggers
		-- ----
		update "pg_catalog".pg_trigger
				set tgrelid = v_tab_row.tab_reloid
				where tgrelid = v_tab_row.indexrelid;
		get diagnostics v_n = row_count;
		if v_n > 0 then
			update "pg_catalog".pg_class
					set reltriggers = reltriggers + v_n
					where oid = v_tab_row.tab_reloid;
		end if;

		-- ----
		-- Restore all original rewrite rules
		-- ----
		update "pg_catalog".pg_rewrite
				set ev_class = v_tab_row.tab_reloid
				where ev_class = v_tab_row.indexrelid;
		get diagnostics v_n = row_count;
		if v_n > 0 then
			update "pg_catalog".pg_class
					set relhasrules = true
					where oid = v_tab_row.tab_reloid;
		end if;

	end if;

	-- ----
	-- Mark the table not altered in our configuration
	-- ----
	update sl_table
			set tab_altered = false where tab_id = p_tab_id;

	return p_tab_id;
end;