54 lines
2.1 KiB
MySQL
54 lines
2.1 KiB
MySQL
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CREATE FUNCTION historicize() RETURNS trigger
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LANGUAGE plpgsql SECURITY DEFINER
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AS $$
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BEGIN
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IF (TG_OP = 'INSERT') OR (TG_OP = 'UPDATE') THEN
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EXECUTE format('INSERT INTO ' || TG_TABLE_NAME || '_history VALUES (DEFAULT, now(), txid_current(), False, $1.*)') USING NEW;
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RETURN NEW;
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ELSE
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EXECUTE format('INSERT INTO ' || TG_TABLE_NAME || '_history VALUES (DEFAULT, now(), txid_current(), True, $1.*)') USING OLD;
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RETURN OLD;
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END IF;
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END;
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$$;
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CREATE TABLE person (
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id serial PRIMARY KEY,
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name character varying(50) NOT NULL UNIQUE,
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email character varying(50) NOT NULL UNIQUE
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);
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CREATE TABLE person_history (
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history_id serial PRIMARY KEY,
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history_timestamp timestamp NOT NULL,
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history_transaction bigint NOT NULL,
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history_tombstone boolean NOT NULL,
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id integer NOT NULL,
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name character varying(50) NOT NULL,
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email character varying(50) NOT NULL
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);
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CREATE TRIGGER person_historicize AFTER INSERT OR DELETE OR UPDATE ON person FOR EACH ROW EXECUTE PROCEDURE historicize();
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INSERT INTO person (name, email) VALUES ('michael', 'michael@hierweck.de');
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INSERT INTO person (name, email) VALUES ('annika', 'annika@hierweck.de');
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UPDATE person SET email='mh@hierweck.de' WHERE name='michael';
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UPDATE person SET email='ah@hierweck.de' WHERE name='annika';
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DELETE FROM person WHERE name='michael';
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DELETE FROM person WHERE name='annika';
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INSERT INTO person (name, email) VALUES ('michael', 'michael@hierweck.de');
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INSERT INTO person (name, email) VALUES ('annika', 'annika@hierweck.de');
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BEGIN;
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INSERT INTO person (name, email) VALUES ('mx', 'mx@hierweck.de');
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INSERT INTO person (name, email) VALUES ('ax', 'ax@hierweck.de');
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UPDATE person SET email='mxx@hierweck.de' WHERE name='mx';
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UPDATE person SET email='axx@hierweck.de' WHERE name='ax';
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COMMIT;
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SELECT * FROM person_history WHERE history_id IN (SELECT max(history_id) AS history_id FROM person_history WHERE history_transaction <= 12345 GROUP BY id);
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SELECT * FROM person_history WHERE history_id IN (SELECT max(history_id) AS history_id FROM person_history WHERE history_transaction <= 12345 GROUP BY name);
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