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|
SELECT * FROM pglogical_regress_variables()
\gset
\c :provider_dsn
SELECT pglogical.replicate_ddl_command($$
CREATE TABLE public.test_trg_data(id serial primary key, data text);
$$);
replicate_ddl_command
-----------------------
t
(1 row)
SELECT * FROM pglogical.replication_set_add_table('default', 'test_trg_data');
replication_set_add_table
---------------------------
t
(1 row)
SELECT pglogical.wait_slot_confirm_lsn(NULL, NULL);
wait_slot_confirm_lsn
-----------------------
(1 row)
\c :subscriber_dsn
CREATE TABLE test_trg_hist(table_name text, action text, action_id serial, original_data text, new_data text);
CREATE FUNCTION test_trg_data_hist_fn() RETURNS TRIGGER AS $$
BEGIN
IF (TG_OP = 'UPDATE') THEN
INSERT INTO test_trg_hist (table_name,action,original_data,new_data)
VALUES (TG_TABLE_NAME::TEXT, substring(TG_OP,1,1), ROW(OLD.*), ROW(NEW.*));
RETURN NEW;
ELSIF (TG_OP = 'DELETE') THEN
INSERT INTO test_trg_hist (table_name,action,original_data)
VALUES (TG_TABLE_NAME::TEXT, substring(TG_OP,1,1), ROW(OLD.*));
RETURN OLD;
ELSIF (TG_OP = 'INSERT') THEN
INSERT INTO test_trg_hist (table_name,action,new_data)
VALUES (TG_TABLE_NAME::TEXT, substring(TG_OP,1,1), ROW(NEW.*));
RETURN NEW;
ELSE
RAISE WARNING 'Unknown action';
RETURN NULL;
END IF;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER test_trg_data_hist_trg
AFTER INSERT OR UPDATE OR DELETE ON test_trg_data
FOR EACH ROW EXECUTE PROCEDURE test_trg_data_hist_fn();
\c :provider_dsn
INSERT INTO test_trg_data(data) VALUES ('no_history');
SELECT pglogical.wait_slot_confirm_lsn(NULL, NULL);
wait_slot_confirm_lsn
-----------------------
(1 row)
\c :subscriber_dsn
SELECT * FROM test_trg_data;
id | data
----+------------
1 | no_history
(1 row)
SELECT * FROM test_trg_hist;
table_name | action | action_id | original_data | new_data
------------+--------+-----------+---------------+----------
(0 rows)
ALTER TABLE test_trg_data ENABLE REPLICA TRIGGER test_trg_data_hist_trg;
\c :provider_dsn
INSERT INTO test_trg_data(data) VALUES ('yes_history');
UPDATE test_trg_data SET data = 'yes_history';
DELETE FROM test_trg_data;
SELECT pglogical.wait_slot_confirm_lsn(NULL, NULL);
wait_slot_confirm_lsn
-----------------------
(1 row)
\c :subscriber_dsn
SELECT * FROM test_trg_data;
id | data
----+------
(0 rows)
SELECT * FROM test_trg_hist;
table_name | action | action_id | original_data | new_data
---------------+--------+-----------+-----------------+-----------------
test_trg_data | I | 1 | | (2,yes_history)
test_trg_data | U | 2 | (1,no_history) | (1,yes_history)
test_trg_data | U | 3 | (2,yes_history) | (2,yes_history)
test_trg_data | D | 4 | (1,yes_history) |
test_trg_data | D | 5 | (2,yes_history) |
(5 rows)
DROP TABLE test_trg_hist CASCADE;
\c :provider_dsn
SELECT pglogical.replicate_ddl_command($$
CREATE TABLE public.basic_dml (
id serial primary key,
other integer,
data text,
something interval
);
$$);
replicate_ddl_command
-----------------------
t
(1 row)
SELECT * FROM pglogical.replication_set_add_table('default', 'basic_dml');
replication_set_add_table
---------------------------
t
(1 row)
SELECT pglogical.wait_slot_confirm_lsn(NULL, NULL);
wait_slot_confirm_lsn
-----------------------
(1 row)
\c :subscriber_dsn
-- create row filter trigger
CREATE FUNCTION filter_basic_dml_fn() RETURNS TRIGGER AS $$
BEGIN
IF (TG_OP in ('UPDATE', 'INSERT')) THEN
-- treating 'DELETE' as pass-through
IF (NEW.id > 1 AND NEW.data IS DISTINCT FROM 'baz' AND NEW.data IS DISTINCT FROM 'bbb') THEN
RETURN NEW;
ELSE
RETURN NULL;
END IF;
ELSE
RAISE WARNING 'Unknown action';
RETURN NULL;
END IF;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER filter_basic_dml_trg
BEFORE INSERT OR UPDATE ON basic_dml
FOR EACH ROW EXECUTE PROCEDURE filter_basic_dml_fn();
\c :provider_dsn
-- insert into table at provider
\COPY basic_dml FROM STDIN WITH CSV
SELECT pglogical.wait_slot_confirm_lsn(NULL, NULL);
wait_slot_confirm_lsn
-----------------------
(1 row)
\c :subscriber_dsn
-- rows received at suscriber as trigger is not enabled yet.
SELECT * from basic_dml ORDER BY id;
id | other | data | something
------+-------+------+-----------
5000 | 1 | aaa | @ 1 hour
5001 | 2 | bbb | @ 2 years
5002 | 3 | ccc | @ 3 mins
5003 | 4 | ddd | @ 4 days
(4 rows)
-- Now enable trigger:
ALTER TABLE basic_dml ENABLE REPLICA TRIGGER filter_basic_dml_trg;
\c :provider_dsn
TRUNCATE basic_dml;
-- check basic insert replication
INSERT INTO basic_dml(other, data, something)
VALUES (5, 'foo', '1 minute'::interval),
(4, 'bar', '12 weeks'::interval),
(3, 'baz', '2 years 1 hour'::interval),
(2, 'qux', '8 months 2 days'::interval),
(1, NULL, NULL);
SELECT pglogical.wait_slot_confirm_lsn(NULL, NULL);
wait_slot_confirm_lsn
-----------------------
(1 row)
\c :subscriber_dsn
-- rows filtered at suscriber as trigger is enabled.
SELECT * from basic_dml ORDER BY id;
id | other | data | something
----+-------+------+-----------------
2 | 4 | bar | @ 84 days
4 | 2 | qux | @ 8 mons 2 days
5 | 1 | |
(3 rows)
\set VERBOSITY terse
DROP FUNCTION test_trg_data_hist_fn() CASCADE;
NOTICE: drop cascades to trigger test_trg_data_hist_trg on table test_trg_data
DROP FUNCTION filter_basic_dml_fn() CASCADE;
NOTICE: drop cascades to trigger filter_basic_dml_trg on table basic_dml
\c :provider_dsn
\set VERBOSITY terse
SELECT pglogical.replicate_ddl_command($$
DROP TABLE public.test_trg_data CASCADE;
DROP TABLE public.basic_dml CASCADE;
$$);
NOTICE: drop cascades to table public.test_trg_data membership in replication set default
NOTICE: drop cascades to table public.basic_dml membership in replication set default
replicate_ddl_command
-----------------------
t
(1 row)
|
