存储过程帮助中的 T-SQL 调用函数

Question

你能帮我写这段代码吗？

//** 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

不知道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

您只需要在更新语句之前调用该函数一次 - 如下所示：

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

警告：不应将sp_前缀用于存储过程！该前缀已被Microsoft保留供自己使用 - 不惜一切代价避免使用它。根据使用该前缀调用存储过程的方式，您可能还会首先在master数据库中进行不必要的查找 - 因此请尽量远离该前缀！

更新：在一个名为 Get 的函数中实际插入数据是糟糕的设计...... - 你可能会让你的来电者感到惊讶......

我要做的是：直接在存储过程中执行所有这些逻辑;我不确定你的表格是什么样子的 - 但你可以尝试这样的东西：

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