Postgresql c#notify触发器不会向c#insert、delete works发送更新通知

我使用从postgresql数据库发送的通知，插入通知工作正常，但当缓冲区表数据发生更改时，我的更新插入不会发送消息，我不明白为什么您可能会发现我在这里运气不好：(

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Postgresql触发器

CREATE OR REPLACE FUNCTION buffer_notify_insert()
RETURNS trigger AS
$BODY$
BEGIN
PERFORM pg_notify('mymessage', 'Duomenys ideti');
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION buffer_notify_insert()
OWNER TO postgres;

CREATE TRIGGER buffer_notify_insert_trigger
AFTER INSERT
ON buffer
FOR EACH STATEMENT
EXECUTE PROCEDURE buffer_notify_insert();

和更新触发器，该触发器不工作，但列中的数据已更改

CREATE OR REPLACE FUNCTION buffer_notify_update()
RETURNS trigger AS
$BODY$
BEGIN
PERFORM pg_notify('mymessage', 'Duomenys atnaujinti');
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION buffer_notify_update()
OWNER TO postgres;

CREATE TRIGGER buffer_notify_update_trigger
AFTER DELETE
ON buffer
FOR EACH STATEMENT
EXECUTE PROCEDURE buffer_notify_update();

---

只是一个输入错误：

更新后

，在末尾的第四行。

if (e.AdditionalInformation == "Duomenys atnaujinti") // update notify (does not work)
            {
                this.Close();

            }

CREATE OR REPLACE FUNCTION buffer_notify_insert()
RETURNS trigger AS
$BODY$
BEGIN
PERFORM pg_notify('mymessage', 'Duomenys ideti');
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION buffer_notify_insert()
OWNER TO postgres;

CREATE TRIGGER buffer_notify_insert_trigger
AFTER INSERT
ON buffer
FOR EACH STATEMENT
EXECUTE PROCEDURE buffer_notify_insert();

CREATE OR REPLACE FUNCTION buffer_notify_update()
RETURNS trigger AS
$BODY$
BEGIN
PERFORM pg_notify('mymessage', 'Duomenys atnaujinti');
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION buffer_notify_update()
OWNER TO postgres;

CREATE TRIGGER buffer_notify_update_trigger
AFTER DELETE
ON buffer
FOR EACH STATEMENT
EXECUTE PROCEDURE buffer_notify_update();