SQL Trigger for Insert and Update

问题

Sql newbie in need of help.

I have a table with an SQL trigger that occurs on Insert. It looks like this:

ALTER TRIGGER Holiday_ITrig
ON HolidayDate
FOR INSERT
AS
IF NOT EXISTS (
                SELECT
                        ID
                    FROM
                        WorkingDay w
                    INNER JOIN
                        inserted i ON
                            w.ID = I.WorkingDayId
                    WHERE
                        WorkingDayTypeId = 2
                )
BEGIN
    ROLLBACK TRANSACTION
END

However, I also need the trigger to fire on update. Is this possible within the same trigger or do I have to create a new 'update' trigger?

回答1:

Just add UPDATE to the list of actions.

You will need to check that the same logic applies to an UPDATE as well as the original INSERT.

ALTER TRIGGER Holiday_ITrig
ON HolidayDate
FOR INSERT, UPDATE
AS
IF NOT EXISTS (
                SELECT
                        ID
                    FROM
                        WorkingDay w
                    INNER JOIN
                        inserted i ON
                            w.ID = I.WorkingDayId
                    WHERE
                        WorkingDayTypeId = 2
                )
BEGIN
    ROLLBACK TRANSACTION
END

CREATE TRIGGER MSDN article

来源：https://stackoverflow.com/questions/17143639/sql-trigger-for-insert-and-update