83 lines
2.8 KiB
PL/PgSQL
83 lines
2.8 KiB
PL/PgSQL
CREATE FUNCTION historicize() RETURNS trigger
|
|
AS $$
|
|
BEGIN
|
|
IF (TG_OP = 'INSERT') OR (TG_OP = 'UPDATE') THEN
|
|
EXECUTE format('INSERT INTO %I_history VALUES (DEFAULT, now(), txid_current(), False, $1.*)', TG_TABLE_NAME) USING NEW;
|
|
RETURN NEW;
|
|
ELSE
|
|
EXECUTE format('INSERT INTO %I_history VALUES (DEFAULT, now(), txid_current(), True, $1.*)', TG_TABLE_NAME) USING OLD;
|
|
RETURN OLD;
|
|
END IF;
|
|
END;
|
|
$$
|
|
LANGUAGE plpgsql;
|
|
|
|
CREATE TABLE person (
|
|
id serial PRIMARY KEY,
|
|
name character varying(50) NOT NULL UNIQUE,
|
|
email character varying(50) NOT NULL UNIQUE
|
|
);
|
|
|
|
CREATE TABLE person_history (
|
|
history_id serial PRIMARY KEY,
|
|
history_timestamp timestamp NOT NULL,
|
|
history_transaction bigint NOT NULL,
|
|
history_tombstone boolean NOT NULL,
|
|
id integer NOT NULL,
|
|
name character varying(50) NOT NULL,
|
|
email character varying(50) NOT NULL
|
|
);
|
|
|
|
CREATE TRIGGER person_historicize AFTER INSERT OR DELETE OR UPDATE ON person FOR EACH ROW EXECUTE PROCEDURE historicize();
|
|
|
|
CREATE OR REPLACE FUNCTION person_history(transaction bigint, VARIADIC groupby text[]) RETURNS TABLE (
|
|
history_id integer,
|
|
history_timestamp timestamp,
|
|
history_transaction bigint,
|
|
history_tombstone boolean,
|
|
id integer,
|
|
name character varying(50),
|
|
email character varying(50)
|
|
)
|
|
AS $$
|
|
BEGIN
|
|
RETURN QUERY EXECUTE format('SELECT * FROM person_history WHERE history_id IN (SELECT max(history_id) AS history_id FROM person_history WHERE history_transaction <= $1 GROUP BY %s)', array_to_string(groupby, ', ')) USING transaction;
|
|
END;
|
|
$$
|
|
LANGUAGE plpgsql;
|
|
|
|
CREATE OR REPLACE FUNCTION person_history(VARIADIC groupby text[]) RETURNS TABLE (
|
|
history_id integer,
|
|
history_timestamp timestamp,
|
|
history_transaction bigint,
|
|
history_tombstone boolean,
|
|
id integer,
|
|
name character varying(50),
|
|
email character varying(50)
|
|
)
|
|
AS $$
|
|
BEGIN
|
|
RETURN QUERY EXECUTE format('SELECT * FROM person_history WHERE history_id IN (SELECT max(history_id) AS history_id FROM person_history GROUP BY %s)', array_to_string(groupby, ', '));
|
|
END;
|
|
$$
|
|
LANGUAGE plpgsql;
|
|
|
|
INSERT INTO person (name, email) VALUES ('michael', 'michael@hierweck.de');
|
|
INSERT INTO person (name, email) VALUES ('annika', 'annika@hierweck.de');
|
|
|
|
UPDATE person SET email='mh@hierweck.de' WHERE name='michael';
|
|
UPDATE person SET email='ah@hierweck.de' WHERE name='annika';
|
|
|
|
DELETE FROM person WHERE name='michael';
|
|
DELETE FROM person WHERE name='annika';
|
|
|
|
INSERT INTO person (name, email) VALUES ('michael', 'michael@hierweck.de');
|
|
INSERT INTO person (name, email) VALUES ('annika', 'annika@hierweck.de');
|
|
|
|
BEGIN;
|
|
INSERT INTO person (name, email) VALUES ('mx', 'mx@hierweck.de');
|
|
INSERT INTO person (name, email) VALUES ('ax', 'ax@hierweck.de');
|
|
UPDATE person SET email='mxx@hierweck.de' WHERE name='mx';
|
|
UPDATE person SET email='axx@hierweck.de' WHERE name='ax';
|
|
COMMIT;
|