Question

我们要迁移到的ERP系统要求GL的5,000行以下的csv文件。每个文件中的借方和贷方事务必须平衡为零。有多个共享相同交易ID的借方和贷方交易行。

接下来使用偏移量和提取次数，我一次可以提取5000行，但是贷方和借方不平衡。

数据示例：

TranID  Credit  Debit   Balance Account#
1       250     0       250     ABC
1       0       250     0       DEF
2       0       100     -100    GHI
2       50      0       -50     JKL
2       50      0       0       MNO


declare @batchsize INT = 5000,
    @loopcount INT = 0;

while (@loopcount*@batchsize < (select  count(*) from [Apps2].[dbo].[GLTrans]))
begin
  SELECT *  FROM [Apps2].[dbo].[GLTrans]
  ORDER BY tranID
  offset (@batchsize * @loopcount) rows
  fetch next (@batchsize) rows only

  set @loopcount= @loopcount + 1
end

Answer 1

一个简单的解决方案是预处理所有交易并分配批次编号（对于每个CSV文件）。临时表存储了每个TranID的行数。

假定每个TranID的借方和贷方都将保持平衡。

之后，您可以基于临时表生成CSV。

-- create the temp table
create table #trans
(
    TranID      int identity,
    Cnt         int,
    Batch       int
)

-- populate the temp table
insert into #trans (TranID, Cnt)
select TranID, Cnt = count(*)
from   [Apps2].[dbo].[GLTrans]
group by TranID

declare @batchsize  int = 5000,
        @batch      int = 1

while   exists (select * from #trans where Batch is null)
begin
    update  t
    set     Batch   = @batch 
    from
    (
        select  *, cumm = sum(Cnt) over (order by TranID)
        from    #trans
        where   Batch   is null
    ) t
    where   cumm    <= @batchsize 

    select  @batch = @batch + 1
end

--  Verify
select  *, sum(Cnt) over (partition by Batch order by TranID)
from    #trans 
order by TranID

Answer 2

使用表变量遍历数据。有点喜欢在Oracle中使用游标...

如果我正确理解了样本数据，并且假设每个transID的nets都设置为0，那么您可以更改循环逻辑，使其更像do ......，而like this example here则在其中获取下一个交易集并决定是否将批次保持在5k以下。假设每个交易ID设置的净额为$ 0，这应该涵盖填充一批5000行或更少的净额为$ 0的行

Declare @batchCursor TABLE (
    TransID INT,
    Credit INT, -- chose int for expediency 
    Debit INT,
    Balance INT,
    AccountNo Varchar(4)

),

@batchsize INT = 5000,
@rowCount INT = 0,
@transID INT = 1,
@transSize INT = 0;

while (@rowcount <= 5000)
BEGIN
    INSERT INTO @batchCursor
    SELECT * FROM [Apps2].[dbo].[GLTrans] -- you might need to enumerate all your column names
    WHERE TransID = @transID;

    SELECT @transSize = COUNT(*) FROM @batchCursor where TransID = @transID);

    IF(@transSize > 0)
        BEGIN
        IF (@transSize + @rowCount < @batchSize)
           BEGIN
           Set @rowCount += transSize;
           Set @transID += 1;
           END;
        END;
    ELSE Set @transID += 1;

IF((Select count(*) FROM [Apps2].[dbo].[GLTrans] WHERE TransID = @transID) + @rowCount > @batch)
BREAK;

END;

如何一次选择并导出5,000行借方和贷方交易并将借方和贷方余额平衡为零？

2 个答案: