SQL Server：停留在WHILE循环中使用@@ fetch_status

Question

我试图用while循环更新mtrl表，但使用@@fetch_status，但它看起来发生了某些事情，并且存在无限循环。

当我在SQL Server中运行以下代码时，它会卡住。

任何想法是什么问题？

USE [TEST_DB] 
GO 

SET ANSI_NULLS ON 
SET QUOTED_IDENTIFIER ON 
GO 

BEGIN 
    declare @iteid int; 

    SET NOCOUNT ON; 
    Declare items cursor for 
     select mtrl 
     from mtrl 
     where sodtype = 51 and company = 1 and socurrency = 1; 

    open items; 

    fetch next from items into @iteid; 

    while @@fetch_status = 0 
    begin 
     update mtrl 
     set pricer = 2 
     where mtrl = @iteid; 
    end 

    close items; 
    deallocate items; 
END 
GO 

Answer 1

你忘了添加WHILE环路内的另一个FETCH声明：

open items; 
fetch next from items into @iteid; 

while @@fetch_status=0 
begin 
    update mtrl 
    set pricer=2 
    where mtrl = @iteid; 

    fetch next from items into @iteid; 
end 

然而，看到你的查询，你不应该使用CURSOR这个简单的任务：

update mtrl 
    set pricer = 2 
where 
    sodtype = 51 
    and company = 1 
    and socurrency = 1;