我有这个 upsert 函数,它允许我修改一行的 fill_rate 列。
CREATE FUNCTION upsert_fillrate_alarming(integer, boolean) RETURNS VOID AS '
DECLARE
num ALIAS FOR $1;
dat ALIAS FOR $2;
BEGIN
LOOP
-- First try to update.
UPDATE alarming SET fill_rate = dat WHERE equipid = num;
IF FOUND THEN
RETURN;
END IF;
-- Since its not there we try to insert the key
-- Notice if we had a concurent key insertion we would error
BEGIN
INSERT INTO alarming (equipid, fill_rate) VALUES (num, dat);
RETURN;
EXCEPTION WHEN unique_violation THEN
-- Loop and try the update again
END;
END LOOP;
END;
' LANGUAGE 'plpgsql';
是否可以修改此函数以也采用列参数?如果有办法修改函数以获取列和表,则额外加分。