在Advantage中尝试更新临时表中的值,但每次加1。起始值必须比另一个表的最大值大一个,并且每次更新新行时,都会在其中添加一个。忽略除顶部的声明游标和@nevid字符串外的所有内容。我可以在临时表中填充它的evid列,但是它会向每条记录添加71,这是正确的下一个数字,但是我需要将其设为71,72,73等。我在哪里出错? >
DECLARE cur CURSOR;
DECLARE @nevid INTEGER;
DECLARE @startdate string;
DECLARE @starttime string;
DECLARE @expectedenddate string;
DECLARE @expectedendtime string;
DECLARE @enddate string;
DECLARE @endtime string;
@nevid =
(
SELECT (max(evid)+1)
FROM pcplevnt
);
SELECT *
INTO #tmpev
FROM <table>;open cur
AS
SELECT *
FROM #tmpev;
WHILE
FETCH cur do
UPDATE #tmpev
SET evid = cast(@nevid AS sql_char(4));SET @nevid = @nevid + 1;
END WHILE;
close cur;
答案 0 :(得分:1)
我已经建立了MVCE以重现并解决您的问题:
DECLARE cur CURSOR;
DECLARE @nevid INTEGER;
TRY DROP TABLE #pcplevnt; CATCH ALL END TRY;
TRY DROP TABLE #tmpev; CATCH ALL END TRY;
CREATE TABLE
#pcplevnt
(
evid INTEGER
);
DELETE FROM #pcplevnt;
INSERT INTO #pcplevnt (evid) SELECT 111 FROM system.iota;
SET @nevid = (
SELECT
max(evid) + 1
FROM #pcplevnt
);
CREATE TABLE
#tmpev
(
id AUTOINC,
evid NVARCHAR(4)
);
INSERT INTO
#tmpev
(
evid
)
SELECT '1' FROM system.iota
UNION SELECT '2' FROM system.iota
UNION SELECT '3' FROM system.iota
;
OPEN cur AS SELECT * FROM #tmpev;
WHILE FETCH cur DO
UPDATE
#tmpev
SET
evid = CAST(@nevid AS SQL_CHAR(4))
WHERE
id = cur.id
;
SET @nevid = @nevid + 1;
END WHILE;
CLOSE cur;
select * from #tmpev;
请注意循环内WHERE
中的UPDATE
条件:
UPDATE
#tmpev
SET
evid = CAST(@nevid AS SQL_CHAR(4))
WHERE
id = cur.id
;
SET @nevid = @nevid + 1;
我添加了一个主键字段id
,可以在循环内与之进行比较,以便一次只更新临时表的一行。