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: 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: 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;