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sql - 丑陋的大光标

转载 作者:行者123 更新时间:2023-12-02 05:30:52 27 4
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我正在从一个大约有 1000 列的表中填充一个大约有 15 列的表。我需要从大 table 上抢时间。该时间分为分钟和小时 [rn-min] 和 [rn-hr],我需要在新表中以 am/pm 格式显示它们。该表由一家外部公司填写,因此我不能对其进行太多更改,我确实让他们放入了一个转移的列中供我检查。它又大又慢,我只需要几列,而且有很多重复/相似的行。无论如何,我都是用大 table 做小 table 。我写了一个光标,它很慢,我想知道是否有更好的方法来做到这一点。我不能只使用简单的插入(选择列),因为我想更改时间和日期的存储方式。谢谢,感谢任何帮助或建议

declare data CURSOR READ_ONLY FORWARD_ONLY
for
select [raID],
(otherfields),
CAST([RA-rent-mm] as varchar(2)) + '/' + CAST([RA-rent-dd] as varchar(2)) + '/' +
CAST([RA-Rent-CC] as varchar(2)) + CAST([RA-RENT-YY] as varchar(2)) [Date_Out],
CAST([RA-Rtrn-mm] as varchar(2)) + '/' + CAST([RA-Rtrn-dd] as varchar(2)) +
'/' + CAST([RA-Rtrn-CC] as varchar(2)) + CAST([RA-Rtrn-YY] as varchar(2)) [Date_In],
CAST([RA-RENTAL-HOURS] as varchar(2)),
CAST([RA-RENTAL-Minutes] as varchar(2)),
CAST([RA-RTRN-HOURS] as varchar(2)),
CAST([RA-RTRN-MINUTES] as varchar(2)),
(other fields)
from table_name
where Transfered is null
and [RA-rtrn-mm] != 0 --this keeps me from getting the duplicate/similar rows, once this doesn't equal 0 there aren't anymore rows so I just grab this one

declare @sql as varchar(max)
declare @raID int;
(other fields),
declare @rentDate varchar(8);
declare @rtrnDate varchar(8);
declare @rentHours varchar(2);
declare @rentMinutes varchar(2);
declare @rtrnHours varchar(2);
declare @rtrnMinutes varchar(2);
(other fields)

open data
fetch next from data into
@raID,
(other fields),
@rentDate ,
@rtrnDate ,
@rentHours ,
@rentMinutes ,
@rtrnHours ,
@rtrnMinutes ,
(other fields),
while @@FETCH_STATUS = 0
begin
set @rentMinutes = left('0' + @rentMinutes,2);--padding with 0 if minutes is 1-9
set @rtrnMinutes = left('0' + @rtrnMinutes,2);

--turning the varchar times into a time then back to varchar with correct am/pm notation
declare @rentT time = @rentHours + ':' + @rentMinutes;
declare @rtnT time = @rtrnHours + ':' + @rtrnMinutes;
declare @rentTime varchar(7) = convert(varchar(15),@rentT, 100);
declare @returnTime varchar(7) = convert(varchar(15),@rtnT, 100);

--print @rentTime;
set @sql = 'INSERT other_tbl_name(raID, (other fields), Date_Out, Date_In, Time_Out, Time_In, (other fields))
values ('+cast(@raID as varchar(max))+', (other fields),'''+@rentDate+''',
'''+@rtrnDate+''', '''+@rentTime+''', '''+@returnTime+''',
(other fields))';

--exec(@sql)
print @sql

--need a way to make sure the insert worked before updating
--need to update transferred to keep from updating the same info

declare @update as varchar(max) = '
UPDATE Capture.icokc_data
SET Transfered = 1
WHERE [raID] = '+cast(@raID as varchar(10))

--exec(@update)
--print @update

fetch next from data into
@raID,
(other fields)
@rentDate ,
@rtrnDate ,
@rentHours ,
@rentMinutes ,
@rtrnHours ,
@rtrnMinutes ,
(other fields)
end

close data;
deallocate data;

最佳答案

为什么不批量插入它,并在选择中转换日期和时间?

像这样:

INSERT other_tbl_name(raID, (other fields), Date_Out, Date_In, Time_Out, Time_In, (other fields))
select
[raID],
(otherfields),
CAST([RA-rent-mm] as varchar(2)) + '/' + CAST([RA-rent-dd] as varchar(2)) + '/' + CAST([RA-Rent-CC] as varchar(2)) + CAST([RA-RENT-YY] as varchar(2)) [Date_Out],
CAST([RA-Rtrn-mm] as varchar(2)) + '/' + CAST([RA-Rtrn-dd] as varchar(2)) + '/' + CAST([RA-Rtrn-CC] as varchar(2)) + CAST([RA-Rtrn-YY] as varchar(2)) [Date_In],
CONVERT(varchar(15),DATEADD(minute, [RA-RENTAL-Minutes], DATEADD(hour, [RA-RENTAL-HOURS], '00:00')), 100) as [Time_out],
CONVERT(varchar(15),DATEADD(minute, [RA-RTRN-MINUTES], DATEADD(hour, [RA-RTRN-HOURS], '00:00')), 100) as [Time_in],
(other fields)
from table_name
where Transfered is null
and [RA-rtrn-mm] != 0

UPDATE Capture.icokc_data
SET Transfered = 1
WHERE [raID] IN
(
select
[raID]
from table_name
where Transfered is null
-- and [RA-rtrn-mm] != 0 -- not sure about this one
)

关于sql - 丑陋的大光标,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12397851/

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