如何創建此存儲過程？

Question

我有兩個表：

CREATE TABLE [NEWS] 
(
    [ID]  INT IDENTITY(1,1) NOT NULL, 
    [TITLE] VARCHAR(500) NULL, 
    [CONTENT] VARCHAR(800) NULL, 
    [CREATED] DATETIME DEFAULT(GETDATE()) 

    PRIMARY KEY ([ID]) 
) 

CREATE TABLE [LOG] 
(
    [ID]  INT IDENTITY(1,1) NOT NULL, 
    [ACTION] VARCHAR(500) NULL, 
    [CREATED] DATETIME DEFAULT(GETDATE()) 

    PRIMARY KEY ([ID]) 
) 

我想要做下列程序：

我有一個輸入參數@NewsId。

STEP 1

• 如果NewsId是NULL：我想該行保存到表（NEWS）。
• 如果newsid已定義，那麼我想更新該行。

STEP 2

• 我想要做的步驟1中，然後將記錄保存到一個名爲LOG表。
• INSERT INTO LOG ("Action") VALUES ("insert or update")

我能如何使用存儲過程，這兩個步驟？

如何在成功完成後再進入第2步？

Answer 1

這是一個簡單的例子，讓你去。

create procedure MyProc (@NewsId int) as 
Begin 

    -- you should really pass these in? 
    declare @title varchar(500) = 'A title' 
    declare @content varchar(800) = 'A piece of content' 


    if @NewsId is null 
    begin 

    Begin Try 
     insert into News (Title, Content) values (@title, @content) 

     -- get the new id just inserted 
     set @NewsId = SCOPE_IDENTITY() 

     insert into Log (Action) values ('insert') 
    End Try 

    Begin Catch 
     .... handle error 
    end catch 

    end 
    else 
    begin 
     update News set Title = @title, Content = @content 
     where id = @NewsId 
     insert into Log (Action) values ('update') 

    end 

end 

從CodeProject：

Begin Try 
The_Query_for_which_we_need_to_do_the_ Error_Handling 
End Try 
Begin Catch 

    If there is some error in the query within the Try block, this flow 
    will be passed to this Catch block. 

End catch