[英]Convert PL SQL function to T-SQL with cursor loop and fetch
該函數的代碼如下:
CREATE OR REPLACE FUNCTION FTTH_GETBUSZONECODEMULTI(
p_house_nbr IN VARCHAR2,
p_as_of_date IN DATE DEFAULT SYSDATE)
RETURN VARCHAR2
AS
CURSOR l_get_cur
IS
SELECT
LTRIM(RTRIM(BZO.B2FEDC)) BusinessZoneCode
FROM
[not wasting your time with business logic]
l_return VARCHAR2(32767);
BEGIN
--
FOR l_get_rec IN l_get_cur LOOP
l_return := l_return || '|' || l_get_rec.BusinessZoneCode;
END LOOP;
--
CASE
WHEN l_return IS NULL THEN RETURN NULL;
ELSE RETURN l_return || '|';
END CASE;
--
END FTTH_GETBUSZONECODEMULTI;
我的翻譯嘗試如下:
CREATE FUNCTION ftth_GETBUSZONECODEMULTI(
@p_house_nbr VARCHAR(4000),
@p_as_of_date DATETIME)
RETURNS VARCHAR(4000)
AS
BEGIN
SET @p_as_of_date = GETDATE()
DECLARE l_get_cur CURSOR LOCAL
FOR
SELECT
LTRIM(RTRIM(BZO.B2FEDC)) BusinessZoneCode
FROM
[not wasting your time with business logic]
DECLARE @l_return VARCHAR(MAX);
--
SET @l_return = isnull(@l_return, '') + '|' + ISNULL((FETCH BusinessZoneCode from l_get_cur), '');
--
if @l_return IS NULL begin RETURN NULL END
if @l_return is not null BEGIN RETURN isnull(@l_return, '') + '|' END;
END
我認為問題在於我如何嘗試獲取值 - 即使我在其中放置了“NEXT”,它也無法正常工作。 我已經嘗試了 6 種不同的方式來安排 FETCH,但都沒有奏效。
這是游標使用的一些變化,我可能在游標循環結束的地方錯了,所以你可能需要調整它:
CREATE FUNCTION ftth_GETBUSZONECODEMULTI(
@p_house_nbr VARCHAR(4000),
@p_as_of_date DATETIME)
RETURNS VARCHAR(4000)
AS
BEGIN
declare @BusinessZoneCode varchar(500)
SET @p_as_of_date = GETDATE()
DECLARE l_get_cur CURSOR LOCAL
FOR
SELECT
LTRIM(RTRIM(BZO.B2FEDC)) BusinessZoneCode
FROM
[not wasting your time with business logic]
OPEN l_get_cur
fetch next from l_get_cur
into @BusinessZoneCode
WHILE @@FETCH_STATUS = 0
begin
DECLARE @l_return VARCHAR(MAX);
--
SET @l_return = isnull(@l_return, '') + '|' + ISNULL((@BusinessZoneCode), '');
--
if @l_return IS NULL begin RETURN NULL END
if @l_return is not null BEGIN RETURN isnull(@l_return, '') + '|' END
fetch next from l_get_cur
into @BusinessZoneCode
end
close l_get_cur
deallocate l_get_cur
END
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