Trigger&Procedure的應用

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[tg_user_add] ' )  and   OBJECTPROPERTY (id, N ' IsTrigger ' )  =   1 )
drop   trigger   [ dbo ] . [ tg_user_add ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[tg_user_edit] ' )  and   OBJECTPROPERTY (id, N ' IsTrigger ' )  =   1 )
drop   trigger   [ dbo ] . [ tg_user_edit ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[tg_test] ' )  and   OBJECTPROPERTY (id, N ' IsTrigger ' )  =   1 )
drop   trigger   [ dbo ] . [ tg_test ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[sp_output] ' )  and   OBJECTPROPERTY (id, N ' IsProcedure ' )  =   1 )
drop   procedure   [ dbo ] . [ sp_output ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[sp_output_return] ' )  and   OBJECTPROPERTY (id, N ' IsProcedure ' )  =   1 )
drop   procedure   [ dbo ] . [ sp_output_return ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[sp_return] ' )  and   OBJECTPROPERTY (id, N ' IsProcedure ' )  =   1 )
drop   procedure   [ dbo ] . [ sp_return ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[test_output] ' )  and   OBJECTPROPERTY (id, N ' IsProcedure ' )  =   1 )
drop   procedure   [ dbo ] . [ test_output ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[test_output_return] ' )  and   OBJECTPROPERTY (id, N ' IsProcedure ' )  =   1 )
drop   procedure   [ dbo ] . [ test_output_return ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[test_return] ' )  and   OBJECTPROPERTY (id, N ' IsProcedure ' )  =   1 )
drop   procedure   [ dbo ] . [ test_return ]
GO

if   exists  ( select   *   from  dbo.sysobjects  where  id  =   object_id (N ' [dbo].[user] ' )  and   OBJECTPROPERTY (id, N ' IsUserTable ' )  =   1 )
drop   table   [ dbo ] . [ user ]
GO

CREATE   TABLE   [ dbo ] . [ user ]  (
     [ id ]   [ char ]  ( 10 ) COLLATE Chinese_Taiwan_Stroke_CI_AS  NOT   NULL  ,
     [ name ]   [ varchar ]  ( 10 ) COLLATE Chinese_Taiwan_Stroke_CI_AS  NOT   NULL  ,
     [ ename ]   [ varchar ]  ( 50 ) COLLATE Chinese_Taiwan_Stroke_CI_AS  NOT   NULL  ,
     [ email ]   [ varchar ]  ( 50 ) COLLATE Chinese_Taiwan_Stroke_CI_AS  NOT   NULL  ,
     [ tel ]   [ varchar ]  ( 20 ) COLLATE Chinese_Taiwan_Stroke_CI_AS  NOT   NULL  
)  ON   [ PRIMARY ]
GO

ALTER   TABLE   [ dbo ] . [ user ]   WITH   NOCHECK   ADD  
     CONSTRAINT   [ PK_user ]   PRIMARY   KEY    CLUSTERED  
    (
         [ id ]
    )   ON   [ PRIMARY ]  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  OFF  
GO

CREATE   PROCEDURE   [ dbo ] . [ sp_output ]
(
    @i   char ( 1 ) = ' 1 ' ,
    @a   varchar ( 5 ) = null  output
)
  AS
begin
   if ( @i = ' 1 ' )
     set   @a = ' aaaaa '
   else
     set   @a = ' bbbbb '
end
GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  OFF  
GO

CREATE   PROCEDURE   [ dbo ] . [ sp_output_return ]
(
    @i   char ( 1 ) = ' 1 ' ,
    @a   varchar ( 5 ) = null  output
)
  AS
begin
   if ( @i = ' 1 ' )
   begin
     set   @a = ' aaaaa '
     return   1
   end
   else
   begin
     set   @a = ' bbbbb '
     return   0
   end
end
GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  OFF  
GO

CREATE   PROCEDURE   [ dbo ] . [ sp_return ]
(
    @i   char ( 1 ) = ' 1 '
)
  AS
begin
   /*
  --return只能返回一個int類型的值,相反output則可以傳回更多類型的值
  無條件退出查詢或程序。RETURN 是立即而完整的，而且可在任何時刻用於退出程序、批次，或陳述式封鎖。
  其中附隨有 RETURN 的陳述式不會被執行。
   */
  
   if ( @i = ' 1 ' )
     return   1
   else
     return   0
end
GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  OFF  
GO

CREATE   PROCEDURE   [ dbo ] . [ test_output ]
(
   @i   char ( 1 ) = ' 1 '
)
  AS
begin
   declare   @b   varchar ( 5 )
   exec  sp_output  @i , @b  output
   -- exec @b=sp_output @i,@b output
   print   @b
end
GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  OFF  
GO

CREATE   PROCEDURE   [ dbo ] . [ test_output_return ]
(
   @i   char ( 1 ) = ' 1 '
)
  AS
begin
   declare   @b   int
   declare   @a   varchar ( 5 )
   exec   @b = sp_output_return  @i , @a  output
   print ( @a )
   print ( @b )
end
GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  OFF  
GO

CREATE   PROCEDURE   [ dbo ] . [ test_return ]
(
   @i   char ( 1 ) = ' 1 '
)
  AS
begin
   declare   @b   varchar ( 5 )
   exec   @b = sp_return  @i
   if  ( @b = 1 )
     print ( ' aaaaa ' )
   else
     print ( ' bbbbb ' )
end
GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

CREATE   TRIGGER   [ tg_user_add ]   ON   [ dbo ] . [ user ]  
FOR   INSERT  
AS
begin
   declare   @id   char ( 10 )
   declare   @name   varchar ( 10 )
   declare   @ename   varchar ( 50 )
   declare   @email   varchar ( 50 )
   declare   @tel   varchar ( 20 )
   declare   @sql   varchar ( 500 )
   declare  user_cr  cursor   for    select   [ id ] , [ name ] , [ ename ] , [ email ] , [ tel ]   from  inserted
   open  user_cr
   fetch   next   from  user_cr
   into   @id , @name , @ename , @email , @tel
   while   @@fetch_status = 0
   begin
     set   @sql = ' insert into [user] (id,name,ename,email,tel) values ( '''   +   @id   +   ''' , '''   +   @name   +   ''' , '''   +   @ename   +   ''' , '''   +   @email   +   ''' , '''   +   @tel   +   ''' ) '
     print ( @sql )
     fetch   next   from  user_cr
     into   @id , @name , @ename , @email , @tel
   end
   close  user_cr
   deallocate  user_cr
   select   *   from  deleted
   select   *   from  inserted
end





GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

CREATE   TRIGGER   [ tg_user_edit ]   ON   [ dbo ] . [ user ]  
FOR   update
AS
begin
   declare   @id   char ( 10 )
   declare   @name   varchar ( 10 )
   declare   @ename   varchar ( 50 )
   declare   @email   varchar ( 50 )
   declare   @tel   varchar ( 20 )
   declare   @sql   varchar ( 500 )
   declare  user_cr  cursor   for    select   [ id ] , [ name ] , [ ename ] , [ email ] , [ tel ]   from  inserted
   open  user_cr
   fetch   next   from  user_cr
   into   @id , @name , @ename , @email , @tel
   while   @@fetch_status = 0
   begin
     set   @sql = ' insert into [user] (id,name,ename,email,tel) values ( '''   +   @id   +   ''' , '''   +   @name   +   ''' , '''   +   @ename   +   ''' , '''   +   @email   +   ''' , '''   +   @tel   +   ''' ) '
     print ( @sql )
     fetch   next   from  user_cr
     into   @id , @name , @ename , @email , @tel
   end
   close  user_cr
   deallocate  user_cr
   select   *   from  deleted
   select   *   from  inserted
   exec  test_output_return
end





GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

CREATE   TRIGGER   [ tg_test ]   ON   [ dbo ] . [ user ]  
FOR   INSERT ,  UPDATE ,  DELETE  
AS
   print ( ' 1111111111 ' )
GO
SET  QUOTED_IDENTIFIER  OFF  
GO
SET  ANSI_NULLS  ON  
GO

說明:
1,trigger中可以調用procedure.而procedure中不可以調用tiegger