MS SQL 2008 - 触发器

Question

我是 SQL 触发器的新手，需要一些帮助。我有下面的更新触发器，它工作正常 - 当 Status = 'Completed' 或 'Created By Error' 时更新 CompletedDate。

ALTER TRIGGER [dbo].[trigger_CompletedDate] ON [dbo].[ERP_PurchaseRequest] AFTER UPDATE
AS 
BEGIN

SET NOCOUNT ON;

    IF (UPDATE(PRStatus))
    BEGIN
        UPDATE pr SET CompletedDate = GETDATE()
            FROM  [ERP_PurchaseRequest] pr
            INNER JOIN INSERTED i ON pr.PRStatus = i.PRStatus
            WHERE (i.PRStatus = 'Completed'
                    AND pr.PRID = i.PRID)
                OR
                    (i.PRStatus = 'Created By Error'
                    AND pr.PRID = i.PRID)
    END

END

现在，我需要修改此触发器以执行以下操作：

1) 如果 i.PRStatus = 'Completed'，则 UPDATE CompletedDate，并对不同的表执行另一个 UPDATE 查询 WHERE PRID 到 PRID 更新，如：

UPDATE Table1 SET Column1 = 'Yes" Where PRID = i.PRID (from the inserted table)

2) ElseIf i.PRStatus = 'Created By Error'，则仅更新 CompletedDate。

如果可能，请提供示例代码。赞赏！

谢谢，

Answer 1

您的问题并没有很清楚地说明您究竟想在这里实现什么，而且您也没有展示任何您试图让它发挥作用的东西。我将尽我最大的努力试图弄清楚你在这里要做什么，但我没有所有的信息。无论如何，给你。让我们知道它是否有效。

IF OBJECT_ID('ERP_PurchaseRequest') IS NULL
CREATE TABLE ERP_PurchaseRequest (
    PRID INT,
    PRStatus VARCHAR(255),
    CompletedDate DATETIME)
GO
IF OBJECT_ID('OtherTable') IS NULL
CREATE TABLE OtherTable (
    PRID INT,
    Column1 VARCHAR(50))
GO


CREATE TRIGGER [dbo].[trigger_CompletedDate] ON ERP_PurchaseRequest AFTER UPDATE
AS 
BEGIN
    SET NOCOUNT ON;

    IF (UPDATE(PRStatus))
    BEGIN
        UPDATE pr SET CompletedDate = GETDATE()
        FROM  ERP_PurchaseRequest pr
        INNER JOIN inserted i ON pr.PRID = i.PRID
            AND pr.PRStatus = i.PRStatus
        WHERE i.PRStatus IN ('Completed', 'Created By Error')

        UPDATE ot SET Column1 = 'Yes'
        FROM OtherTable ot
        INNER JOIN inserted i on i.PRID = ot.PRID
        WHERE I.PRStatus = 'Completed'
    END
END