我有一个使用嵌套游标的代码。当我解析它时,SQL Studio告诉我“命令已成功完成”,但是每执行一次,我都会得到一堆重复的信息:“名称为'cursor_stats'的游标不存在。”对于每行提到的cursor_stats,都会显示错误消息,然后重复多次。知道我的问题是什么吗?
DECLARE @dc_grp AS VARCHAR(50)
DECLARE @reqt_id AS INT
DECLARE cursor_pairs CURSOR FOR
SELECT DISTINCT dc.dc_grp, dcx.reqt_id
FROM DC_GRP dc INNER JOIN
DC_GRPX dcx ON dc.dc_grp = dcx.dc_grp INNER JOIN
REQT req ON dcx.reqt_id = req.reqt_id
WHERE dc.calc_stddev = 1 AND req.v_a = 'V' AND dcx.stddev_last_update != CONVERT(datetime, Convert(int, GetDate()))
ORDER BY dc.dc_grp, dcx.reqt_id
--------------------------------------
DECLARE @vavg AS FLOAT
DECLARE @vstddev AS FLOAT
DECLARE cursor_stats CURSOR FOR
SELECT AVG(r.[var]), STDEV(r.[var])
FROM RESULTS r INNER JOIN
INSTANCE i ON r.inst_id = i.inst_id
WHERE i.dc_grp = @dc_grp AND r.reqt_id = @reqt_id AND r.[var] != 0 AND r.inst_id IN
(
SELECT TOP 100 inst_id
FROM RESULTS
WHERE reqt_id = @reqt_id
ORDER BY inst_id DESC
)
---------------------------------------
OPEN cursor_pairs
FETCH NEXT FROM cursor_pairs INTO @dc_grp, @reqt_id
WHILE @@FETCH_STATUS = 0
BEGIN
OPEN cursor_stats
FETCH NEXT FROM cursor_stats INTO @vavg, @vstddev
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT @dc_grp + ' ' + @reqt_id + ' ' + @vavg + ' ' + @vstddev
FETCH NEXT FROM cursor_stats INTO @vavg, @vstddev
END
CLOSE cursor_stats
DEALLOCATE cursor_stats
FETCH NEXT FROM cursor_pairs INTO @dc_grp, @reqt_id
END
CLOSE cursor_pairs
DEALLOCATE cursor_pairs
最佳答案
您不应在循环内添加DEALLOCATE cursor_stats
。
http://msdn.microsoft.com/en-us/library/ms188782.aspx
仅在所有处理完成后再做
关于sql - 名称为 'cursor_name'的游标不存在,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17972022/