Question

在dbo.BOM中插入新记录时，或者我的列BOM.Site更新后，我想在BOM.Site中查找dbo.SiteMap值，然后将其恢复SiteMap.SiteName值并将其插入BOM.SiteMap列。所以我认为触发器将是要走的路，但它不起作用。（如果触发器不是最好的配件请告诉我！）有什么建议吗？提前谢谢。

表：

=BOM=
id |  Site    | SiteMap
---+----------+------
 1 |    Mex   | 
 2 |    MXN   | 
 3 |    USA   | 
 4 |    Mex   | 


=SiteMap=
id | SiteName | Sitecode
---+----------+------
 1 | Mexico   | Mex
 2 | Mexico   | MXN
 3 | USA      | USA
 4 | USA      | United States of America

期望的输出：

=BOM=
id |  Site    | SiteMap
---+----------+------
 1 |    Mex   | Mexico
 2 |    MXN   | Mexico
 3 |    USA   | United States of America
 4 |    Mex   | Mexico

我尝试了几件不同的事情......

CREATE TRIGGER dbo.trMapBom on dbo.BOM
   AFTER INSERT,UPDATE
AS 
BEGIN

    SET NOCOUNT ON;

    IF UPDATE([Site ])
    BEGIN
        UPDATE dbo.BOM
        SET BOM.[Site Map] = 
        (
            SELECT [SiteName]
            from dbo.SiteMap
            where [PlantCode] = [Site ]
        )
    END
END
GO

另一次尝试..

CREATE TRIGGER dbo.trMapBom on dbo.BOM
   AFTER INSERT,UPDATE
AS 
BEGIN

    SET NOCOUNT ON;

    UPDATE dbo.BOM set [Site ] = SiteMap.SiteName
    from dbo.BOM
    inner join dbo.SiteMap
    on BOM.[Site ] = SiteMap.PlantCode

END
GO

Answer 1

您应该在触发器中使用插入的行：

CREATE TRIGGER dbo.trMapBom on dbo.BOM
   AFTER INSERT,UPDATE
AS 
BEGIN

    SET NOCOUNT ON;

    UPDATE b 
    set [SiteMap] = sm.SiteName
    from dbo.BOM b
    inner join dbo.SiteMap sm
    on b.[Site] = sm.SiteCode
    inner join inserted i
    on i.id = b.id

END
GO

SQL触发器在插入或更新时使用另一个表中的值将值插入到同一行中

1 个答案: