如何运行 SQL 触发器

Question

我对 SQL Server 2008 完全hassubproduct ，我编写了一个触发器，并且spdisplaytype在更新或插入hassubproduct和spdisplaytype列时执行，如果它们有值且不为空。

任何帮助表示赞赏。

CREATE TRIGGER [dbo].[hassubproductcheck] 
ON [dbo].[products]
WITH EXECUTE AS CALLER
FOR INSERT, UPDATE
AS
BEGIN
    UPDATE products 
    SET hassubproduct = LTRIM(RTRIM(hassubproduct))

    UPDATE products 
    SET spdisplaytype  = LTRIM(RTRIM(spdisplaytype))
END
GO

Answer 1

沿着这些方向的东西可能更像你想要的。

CREATE TRIGGER [dbo].[hassubproductcheck] ON [dbo].[products] 
WITH EXECUTE AS CALLER FOR INSERT, UPDATE 
AS BEGIN 
    Update p 
        set hassubproduct = LTRIM(RTRIM(i.hassubproduct)) 
        , spdisplaytype = LTRIM(RTRIM(i.spdisplaytype)) 
    from Products p 
    join inserted i on i.PrimaryKey = p.PrimaryKey
    where i.hassubproduct > ''
        OR i.spdisplaytype > ''

END 

Answer 2

您必须使用以下代码来定义触发器。 这将有助于更新。 同样，我们也需要为插入创建一个。

   CREATE TRIGGER [dbo].[hassubproductcheck] ON [dbo].products]             
     AFTER UPDATE 
        AS
        INSERT INTO DBO.SAMPLE_TRIGGER
        SELECT hassubproduct, 'UPDATE(PREVIOUS)' [TABLE-UPDATE] FROM DELETED
        GO

      CREATE TRIGGER [dbo].[hassubproductcheck] ON [dbo].products]             
      AFTER UPDATE
       AS
      INSERT INTO DBO.SAMPLE_TRIGGER
        SELECT hassubproduct, 'UPDATE (LATEST)' [TABLE-UPDATE] FROM DELETED
       GO