sql - 使用带有 CTE 的游标

Question

我需要一个用于以下查询的游标，以便我可以循环以获取/更新/插入一些其他数据。有人可以帮我解决这个问题吗？

DECLARE @FROMDATE DATETIME
DECLARE @TODATE DATETIME
SELECT @FROMDATE = Getdate()
SELECT @TODATE = Getdate() + 7

;WITH DATEINFO(DATES)
     AS (SELECT @FROMDATE
         UNION ALL
         SELECT DATES + 1
         FROM   DATEINFO
         WHERE  DATES < @TODATE)
SELECT *
FROM   DATEINFO
OPTION (MAXRECURSION 0)

我尝试了很多方法，但没有找到有效的。

我正在使用

declare @adate datetime
DECLARE @FROMDATE DATETIME 
DECLARE @TODATE DATETIME 
select @FROMDATE=getdate()
select @TODATE =getdate()+7

declare @weekdates cursor for
WITH DATEINFO(DATES) AS (SELECT @FROMDATE UNION ALL SELECT DATES + 1 FROM DATEINFO WHERE DATES < @TODATE) 
SELECT * FROM DATEINFO OPTION (MAXRECURSION 0)

open @weekdates
fetch next from @weekdates into @adate
while @@fetch_status=0
begin
print 'success'
fetch next from @weekdates into @adate
end
close @weekdates
deallocate @weekdates

我仍然收到错误

Answer 1

只需将其放在公共(public)表表达式之前即可:

DECLARE @FROMDATE DATETIME 
DECLARE @TODATE DATETIME 
select @FROMDATE=getdate()
select @TODATE =getdate()+7

declare boris cursor for

WITH DATEINFO(DATES)
     AS (SELECT @FROMDATE
         UNION ALL
         SELECT DATES + 1
         FROM   DATEINFO
         WHERE  DATES < @TODATE)
SELECT *
FROM   DATEINFO
OPTION (MAXRECURSION 0) 

(但是，插入关于游标的常见警告几乎总是错误的工具。如果您可以找到一种方法以基于集合的方式完成整个操作，那么它通常是更好的选择，并且可能会表现得更好(或者在至少更适合性能调整))