Question

你可以帮我写这段代码吗？

//** Stored procedure Generate list of items to be removed **//

Create Sp_Add_pass   /*purpose is to generate  list to the table to be removed Tbl_list_delete (Handle ,list_id,list_type,delete_handle) */ 

Parameter 
  @card_id nvarchar 
  @card_type nvarchar

Create function Gethandle /* purpose is to auto insert in the table, which returns the handle */

create function [dbo].[fnGetHandle]()
returns int
as
begin
    declare @Handle as int;
    declare @strUser as nchar(256);

    set @Handle = 0 ;
    set @strUser = Current_User;

    insert into tbl_handle
    Output Handle into @Handle output
    ( UserName )
    values
    ( @strUser );

    return @Handle  ;
end;

Insert into tbl_list_delete
(Handle ,list_id,list_type,delete_handle) 
Values (Handle ,list_id,list_type,delete_handle)

/* once the list of items ready & then I can go ahead and do the soft delete items */
Create Sp_remove_pass
Parameters 
  @card_id

不确定如何调用上面创建的Fngethandle函数：

Update tbl_list_delete  
Set deletehandle- @handle 
Where card_id - @card_id, deletehandle = 0  --soft delete

Answer 1

您只需在更新语句之前调用该函数一次 - 例如：

CREATE PROCEDURE dbo.Sp_remove_pass
    @card_id INT
AS BEGIN    
   DECLARE @Handle INT

   SELECT @Handle = dbo.GetHandle()

   UPDATE dbo.tbl_list_delete  
   SET deletehandle - @Handle 
   WHERE card_id - @card_id, deletehandle = 0  --soft delete
END

提示警告：您应不使用存储过程的sp_前缀！ Microsoft已保留该前缀供自己使用 - 尽量不惜一切代价避免使用它。根据您使用该前缀调用存储过程的方式，您可能还会先在master数据库中进行不必要的查找 - 所以请尽量远离该前缀！

更新：在一个名为获取.... 的函数中实际插入数据的设计很糟糕 - 你可能会感到惊讶你的来电者......

我会做什么：直接在存储过程中执行所有这些逻辑;我不确定你的桌子是什么样的 - 但你可以试试这样的东西：

CREATE PROCEDURE dbo.proc_RemovePass
    @card_id INT
AS BEGIN    
   DECLARE @Handle INT

   INSERT INTO dbo.tbl_handle(UserName)
   VALUES(CURRENT_USER)

   SELECT @Handle = SCOPE_IDENTITY()  
   /* I'm assuming here that your table "tbl_Handle" has a column of type
      INT IDENTITY which gets a new value for each row inserted - that's the value
      my code is reading out here. Change this if that's not the case for you */

   UPDATE dbo.tbl_list_delete  
   -- what do you want to set here? Which column?? Not clear.....
   SET DeleteHandle = @Handle   
   -- your WHERE clause is unclear, too - what are you trying to check for here??
   WHERE card_id - @card_id AND DeleteHandle = 0  
END

存储过程协助中的t-sql调用函数

1 个答案: