Question

我有一个Trigger，MyTrigger，我想让它只更改TABLEA中最近插入的行的DESCRIPTION FIELD，[Description]。如图所示，我有它的基础知识，但它目前只扫描TABLEA上每个INSERT的整个表。

TRIGGER如下.............

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TRIGGER MyTrigger  
   ON  TABLEA
   AFTER INSERT
AS 
BEGIN

SET NOCOUNT ON;

UPDATE TABLEA
SET [DESCRIPTION] = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE([DESCRIPTION], '…' , '...'),'–','-'),'’',''''),'½','1/2'),'•','+'),'”','"'),'“','"'),'‘',''''),'—','-'),'é','e')
WHERE  DESCRIPTION LIKE '%…%' 
    OR DESCRIPTION LIKE '%–%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%½%'
    OR DESCRIPTION LIKE '%•%'
    OR DESCRIPTION LIKE '%”%'
    OR DESCRIPTION LIKE '%“%'
    OR DESCRIPTION LIKE '%‘%'
    OR DESCRIPTION LIKE '%—%'
    OR DESCRIPTION LIKE '%é%'

END
GO

Answer 1

我建议在INSTEAD OF触发器中执行此操作，因此实际上只对表执行一个DDL操作（您也可以忽略此处的WHERE子句并将替换调用应用于inserted）。

DROP TRIGGER MyTrigger ON TABLEA;
GO

CREATE TRIGGER dbo.MyTrigger  
   ON  TABLEA
   INSTEAD OF INSERT
AS 
BEGIN
  SET NOCOUNT ON;

  INSERT TABLEA(col1, col2, ..., Description)
    SELECT col1, col2, ...,
    REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
    REPLACE(REPLACE(REPLACE([DESCRIPTION], '…' , '...'),'–','-'),'’','''')
    ,'½','1/2'),'•','+'),'”','"'),'“','"'),'‘',''''),'—','-'),'é','e')
    FROM inserted;
END
GO

Answer 2

为什么你不使用像INSERTED和DELETED这样的表而不是扫描整个表并更新最后一条记录....

检查一下：Use the inserted and deleted Tables

Answer 3

我会使用inserted表并使触发器INSTEAD OF不是AFTER（示例如下）。

SET NOCOUNT ON;

DECLARE     @temp       table   --temp table that can be modified
(
    Column1
    , Column1
    , Column1
    , [DESCRIPTION]     --this table should mimic your TABLEA schema
)

INSERT INTO @temp
SELECT      *
FROM        inserted

UPDATE @temp
SET [DESCRIPTION] = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE([DESCRIPTION], '…' , '...'),'–','-'),'’',''''),'½','1/2'),'•','+'),'”','"'),'“','"'),'‘',''''),'—','-'),'é','e')
WHERE  DESCRIPTION LIKE '%…%' 
    OR DESCRIPTION LIKE '%–%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%½%'
    OR DESCRIPTION LIKE '%•%'
    OR DESCRIPTION LIKE '%”%'
    OR DESCRIPTION LIKE '%“%'
    OR DESCRIPTION LIKE '%‘%'
    OR DESCRIPTION LIKE '%—%'
    OR DESCRIPTION LIKE '%é%'


INSERT INTO TABLEA
            (
                Column1
                , Column1
                , Column1
                , [DESCRIPTION]
            )
SELECT      Column1
            , Column1
            , Column1
            , [DESCRIPTION]
FROM        @temp

END
GO

Answer 4

请参阅代码中的最后一行 - 使用您的表格的唯一标识符/（主键？）更改标识符。

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TRIGGER MyTrigger  
   ON  TABLEA
   AFTER INSERT
AS 
BEGIN

SET NOCOUNT ON;

UPDATE TABLEA
SET [DESCRIPTION] = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE([DESCRIPTION], '…' , '...'),'–','-'),'’',''''),'½','1/2'),'•','+'),'”','"'),'“','"'),'‘',''''),'—','-'),'é','e')
WHERE  (DESCRIPTION LIKE '%…%' 
    OR DESCRIPTION LIKE '%–%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%’%'
    OR DESCRIPTION LIKE '%½%'
    OR DESCRIPTION LIKE '%•%'
    OR DESCRIPTION LIKE '%”%'
    OR DESCRIPTION LIKE '%“%'
    OR DESCRIPTION LIKE '%‘%'
    OR DESCRIPTION LIKE '%—%'
    OR DESCRIPTION LIKE '%é%')
    AND EXISTS (SELECT * FROM Inserted i WHERE i.Identifier = TableA.Identifier)

END
GO

仅针对当前插入的行的SQL触发器

4 个答案: