Question

我不知道为什么这个查询只返回第一行无限

    DECLARE db_cursor1 CURSOR FOR select ilduedt,accountno,ilno from TBPAYSCHED where accountno ='000520285344' and ilno!=0 order by id
    DECLARE @ilduedt datetime;
    DECLARE @accountno varchar(MAX);
    DECLARE @ilno int;
    DECLARE @tempdate datetime;
    OPEN db_cursor1;
    FETCH NEXT FROM db_cursor1 INTO @ilduedt,@accountno,@ilno
    WHILE @@FETCH_STATUS = 0  
    BEGIN  
    select @ilduedt,@accountno,@ilno
    END;
    CLOSE db_cursor1;
    DEALLOCATE db_cursor1;

tbpaysched

accountno    | ilno | ilduedt
------------------------------------------
000520285344    0     2017-07-30 00:00:00.000
000520285344    1     2017-09-15 00:00:00.000
000520285344    2     2017-08-30 00:00:00.000
000520285344    3     2017-09-15 00:00:00.000

它只返回ilno 1无限的行。我不知道，但我想我错过了一些愚蠢的东西。

Answer 1

你错过了while循环中的花药FETCH NEXT，应该是：

WHILE @@FETCH_STATUS = 0  
BEGIN  
select @ilduedt,@accountno,@ilno
FETCH NEXT FROM db_cursor1 INTO @ilduedt,@accountno,@ilno    
END

Answer 2

您没有通过调用FETCH_NEXT从记录集中检索下一行。但是，假设记录集中有一行，上面的代码应该会导致无限循环。

    FETCH NEXT FROM db_cursor1 INTO @ilduedt,@accountno,@ilno
    WHILE @@FETCH_STATUS = 0  
    BEGIN  
        select @ilduedt,@accountno,@ilno
        FETCH NEXT FROM db_cursor1 INTO @ilduedt,@accountno,@ilno
    END;

如何循环游标？

2 个答案: