Rewrite MySQL Trigger to Postgres - mysql

Question

guys!
I have a trigger in MySQL database:
CREATE DEFINER="root"#"127.0.0.1" TRIGGER `tai_actions_for_active_count` AFTER INSERT ON `actions` FOR EACH ROW BEGIN
DECLARE l_isnn TINYTEXT;
IF NEW.action_type IN ('CREATION', 'VERIFICATION', 'CLOSE') THEN
SET l_isnn = IF(NEW.isnn is NULL, '*', NEW.isnn);
IF NOT NEW.action_type = 'CLOSE' THEN
INSERT INTO subscriptions.`statistics_active_count`(`service_id`, `operator_id`, `isnn`, `active_count`)
VALUES (NEW.service_id, NEW.operator_id, l_isnn, 1)
ON DUPLICATE KEY UPDATE active_count = active_count + 1;
ELSE
SET #tai_actions_for_active_count = -1;
UPDATE subscriptions.`statistics_active_count` SET active_count = #tai_actions_for_active_count := active_count - 1
WHERE `service_id` = NEW.service_id AND `operator_id` = NEW.operator_id AND `isnn` = l_isnn;
IF #tai_actions_for_active_count = 0 THEN DELETE FROM subscriptions.`statistics_active_count` WHERE `active_count` = 0; END IF;
END IF;
END IF;
END
So I need to rewrite it to make it works in Postgres database. As there's ON DUPLICATE KEY UPDATE I'm using Postgres version 9.5 with UPSERT (ON CONFLICT (KEY) DO UPDATE).
So I poorly know SQL language can you tell me what I'm doing wrong? There's the Postgres PL code:
DECLARE
l_isnn TEXT;
tai_actions_for_active_count INTEGER;
BEGIN
IF NEW.action_type IN ('CREATION', 'VERIFICATION', 'CLOSE') THEN
IF NEW.isnn is NULL THEN
l_isnn := '*';
ELSE
l_isnn := NEW.isnn;
END IF;
IF NOT NEW.action_type = 'CLOSE' THEN
INSERT INTO "subscriptions.statistics_active_count"(service_id, operator_id, isnn, active_count)
VALUES (NEW.service_id, NEW.operator_id, l_isnn, 1)
ON CONFLICT(active_count) DO UPDATE SET active_count = active_count + 1;
ELSE
tai_actions_for_active_count := -1;
UPDATE "subscriptions.statistics_active_count" SET active_count = active_count - 1
-- (tai_actions_for_active_count := active_count - 1)
WHERE service_id = NEW.service_id AND operator_id = NEW.operator_id AND isnn = l_isnn;
UPDATE "subscriptions.statistics_active_count" SET tai_actions_for_active_count = active_count
WHERE service_id = NEW.service_id AND operator_id = NEW.operator_id AND isnn = l_isnn;
IF tai_actions_for_active_count = 0 THEN DELETE FROM "subscriptions.statistics_active_count" WHERE active_count = 0; END IF;
END IF;
END IF;
RETURN NULL;
END;
As I want to test this trigger I'm getting an error -- relation "subscriptions.statistics_active_count" does not exist
Can you help me with that code?

Answer 1

Finally I've got the solution. I guess :)
BEGIN
IF NEW.action_type IN ('CREATION', 'VERIFICATION', 'CLOSE') THEN
IF NEW.isnn IS NULL THEN
l_isnn := '*';
ELSE
l_isnn := NEW.isnn;
END IF;
IF NOT NEW.action_type = 'CLOSE' THEN
BEGIN
INSERT INTO subscriptions.statistics_active_count (service_id, operator_id, isnn, active_count)
VALUES (NEW.service_id, NEW.operator_id, l_isnn, 1);
EXCEPTION WHEN unique_violation THEN
UPDATE subscriptions.statistics_active_count SET active_count = active_count + 1
WHERE service_id = NEW.service_id and operator_id=NEW.operator_id;
END;
ELSE
tai_actions_for_active_count := -1;
WITH upd AS
(UPDATE subscriptions.statistics_active_count
SET active_count = active_count - 1
WHERE service_id = NEW.service_id AND operator_id = NEW.operator_id AND isnn = l_isnn;
RETURNING active_count)
SELECT *
FROM upd INTO tai_actions_for_active_count;
IF tai_actions_for_active_count = 0 THEN
DELETE FROM public.statistics_active_count
WHERE active_count = 0;
END IF;
END IF;
END IF;
END;