[英]Informix to PostgreSQL - Transaction Function
我需要将Informix函数转换为PostgreSQL。 问题是我知道PostgreSQL不允许在函数中调用BEGIN WORK和COMMIT,所以我不知道如何处理异常和回滚。
我要转换的函数如下所示:
CREATE PROCEDURE buyTicket(pFlightId LIKE transaction.flightId, pAmount LIKE transaction.amount)
DEFINE sqle, isame INTEGER;
DEFINE errdata CHAR(80);
ON EXCEPTION SET sqle, isame, errdata
ROLLBACK WORK;
IF sqle = -530 AND errdata LIKE '%chkfreespots%' THEN
RAISE EXCEPTION -746, 0, 'Not enough free spots';
ELSE
RAISE EXCEPTION sqle, isame, errdata;
END IF
END EXCEPTION;
BEGIN WORK;
INSERT INTO transaction VALUES (0, pFlightId, pAmount);
UPDATE tickets SET freeSpots= freeSpots - pAmount
WHERE flightId = pFlightId;
COMMIT WORK;
END PROCEDURE;
阅读完您的评论后,我终于设法解决了这一问题。 这是与我上面发布的Informix相同的PostgreSQL代码:
CREATE OR REPLACE FUNCTION buyTicket(pFlightId INT, pAmount INT)
RETURNS VOID AS $$
BEGIN
INSERT INTO transaction(flightId,amount) VALUES (pFlightId, pAmount);
UPDATE tickets SET freeSpots = freeSpots - pAmount
WHERE flightId = pFlightId;
EXCEPTION
WHEN others THEN
IF sqlerrm LIKE '%chkfreespots%' THEN
RAISE EXCEPTION 'Not enough free spots';
ELSE
RAISE;
END IF;
END;
$$ LANGUAGE plpgsql;
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