sql - Postgresql 触发器通知

Question

请帮我改正sql语句:

CREATE TRIGGER transaction_insert
    AFTER INSERT ON transaction
    FOR EACH ROW
    WHEN (NEW.tr_type = 55)
    EXECUTE PROCEDURE pg_notify('check_close', to_char(NEW.n_transaction, 999999));

我需要在添加带有 tr_type=55 的行时收到通知。 tr_type 是 int。 n_transaction 是 int。

PostgreSQL 8.3.4

请帮忙!

Answer 1

尝试以下操作:

CREATE TRIGGER transaction_insert
    AFTER INSERT ON transaction
    FOR EACH ROW EXECUTE PROCEDURE transaction_insert_check_close();


CREATE OR REPLACE FUNCTION transaction_insert_check_close() RETURNS TRIGGER AS $transaction_insert_check_close$
BEGIN
    IF (NEW.tr_type = 55) THEN
        PERFORM pg_notify('check_close', to_char(NEW.n_transaction, 999999));
    END IF;

    RETURN NEW;
END;

$transaction_insert_check_close$ LANGUAGE plpgsql;