sql删除触发器不会回滚

如果SELECT中的语句存在，则触发器应该回滚。问题是，事实并非如此。当我仅从触发器运行SELECT时，它显示存在一行。但当我尝试使用与触发器中硬编码相同的值删除时，触发器会触发，但不会回滚。有人知道可能出了什么问题吗

CREATE TRIGGER trg_del ON Projektbefattningar

FOR DELETE
AS

  SELECT @befNr = Befattningsnr, @pNr = pNr, @EtappNr = Etappnr FROM deleted
-- Not currently using these. Using hard coded values to illustrate my problem

    IF EXISTS (
        SELECT *
        FROM projektbefattningar
        WHERE Befattningsnr = 2 AND pNr = 1 and Etappnr = 1 AND Anställningsnr is not null
        )
    BEGIN
        RAISERROR('Could not delete, Anställningsnr is not null', 16, 1)
        --THROW 50001, 'Could not delete, Anställningsnr is not null', 1;
        ROLLBACK TRANSACTION;
    END

GO

试试这个

CREATE TRIGGER trg_del ON Projektbefattningar
FOR DELETE
AS
SELECT @befNr = Befattningsnr
    ,@pNr = pNr
    ,@EtappNr = Etappnr
FROM deleted

-- Not currently using these. Using hard coded values to illustrate my problem
IF EXISTS (
        SELECT 1
        FROM deleted
        WHERE Befattningsnr = 2
            AND pNr = 1
            AND Etappnr = 1
            AND Anställningsnr IS NOT NULL
        )
BEGIN
    RAISERROR (
            'Could not delete, Anställningsnr is not null'
            ,16
            ,1
            )

    --THROW 50001, 'Could not delete, Anställningsnr is not null', 1;
    ROLLBACK TRANSACTION;
END
GO

---

当您使用DELATE时，您认为此触发器将在DELATE语句完成后启动。要在删除前验证条件，需要使用而不是删除。您的触发声明将是：

CREATE TRIGGER trg_del ON Projektbefattningar
INSTEAD OF DELETE
AS

现在要确认delete语句，您需要包括delete alghouth，因为它不会被删除。 最终程序如下所示：

CREATE TRIGGER trg_del ON Projektbefattningar

INSTEAD OF DELETE
AS

  SELECT @befNr = Befattningsnr, @pNr = pNr, @EtappNr = Etappnr FROM deleted
-- Not currently using these. Using hard coded values to illustrate my problem

    IF EXISTS (
        SELECT *
        FROM projektbefattningar
        WHERE Befattningsnr = 2 AND pNr = 1 and Etappnr = 1 AND Anställningsnr is not null
        )
    BEGIN
        RAISERROR('Could not delete, Anställningsnr is not null', 16, 1)
        --THROW 50001, 'Could not delete, Anställningsnr is not null', 1;
        ROLLBACK TRANSACTION;
    END
    ELSE
    BEGIN

       DELETE FROM YourTableToDelete Where idOfYourTable in ( Select idOfYourTable from Deleted )
    END

GO

---

为什么不使用instead of触发器？为什么在回滚之前抛出异常？首先尝试回滚。看看这是否有帮助。这也是一个很好的解决问题的方法，我以前问这个问题时，触发器出现了问题，很好！谢谢另外，与DELETE相反，它不适用于外键，所以这不是很好。