Sql server 2008 将SQL Server 2008查询分解为批处理

我正试图准备一些数据供第三方删除，不幸的是，他们只能批量处理2000条记录中的数据。我有10万条记录，可能需要多次分割和导出这些数据，所以我想以某种方式自动化这个过程

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使用SQLServer2008是否有一种相当简单的方法可以做到这一点？我并没有运行复杂的查询—它离按PKID从某个表顺序选择PKID不太远—虽然我可能可以使用光标来执行此操作，但我想知道是否有更好的方法。

我认为您可以利用使用ROW\u NUMBER，然后使用BETWEEN来指定您喜欢的行范围。或者，如果您知道不存在漏洞，或者不关心漏洞，则可以使用PKID

e、 g

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这通常用于分页结果。4GuysFromRolla有一个很好的

您可以在while@@ROWCOUNT循环中计算出范围，以确定所需的行。它可能比ROW_NUMBER更好，ROW_NUMBER必须从一开始就保持编号

declare @startid int
declare @endid int

-- get one range, these are efficient as they go over the PKID key by range
select top(1) @startid = pkid from sometable order by pkid  -- 1 key visited
select top(2000) @endid = pkid from sometable order by pkid  -- 2000 keys visited
-- note: top 2000 may end up with the 514th id if that is the last one

while @@ROWCOUNT > 0
begin
    insert otherdb.dbo.backupcopy
    select * from sometable
    where pkid between @startid and @endid

    select top(1) @startid = pkid from sometable
    WHERE pkid > @endid -- binary locate
    order by pkid

    select top(2000) @endid = pkid from sometable
    WHERE pkid > @endid -- binary locate, then forward range lookup, max 2000 keys
    order by pkid
end

---

我最终使用了cyberkiwi和Adam提供的方法的组合。我不需要使用ROW_NUMBER，因为我在表数据类型中使用了标识列

这是我使用的代码的一个修订版本，它工作起来很有魅力。再次感谢大家的帮助

use Testing
GO

SET NOCOUNT ON

declare
    @now datetime = GETDATE(), 
    @batchsize int = 2000, 
    @bcpTargetDir varchar(500) = '\\SomeServer\Upload\', 
    @csvQueryServer varchar(500) = '.\SQLExpress', 

    @rowcount integer, 
    @nowstring varchar(100), 
    @batch_id int, 
    @startid int, 
    @endid int, 
    @oidCSV varchar(max), 
    @csvQuery varchar(max), 
    @bcpFilename varchar(200), 
    @bcpQuery varchar(1000)

declare @tblBatchRanges table (
    batch_id integer NOT NULL IDENTITY(1,1) PRIMARY KEY, 
    oid_start integer NOT NULL, 
    oid_end integer NOT NULL, 
    csvQuery varchar(max)
)

-- Create a unique timestamp-based string, which will be used to name the exported files.
select @nowstring = CONVERT(varchar, @now, 112) + '-' + REPLACE(CONVERT(varchar, @now, 114), ':', '')


-- 
select top(1) @startid = oid from Testing..MyObjectIds order by oid
select top(@batchsize) @endid = oid from Testing..MyObjectIds order by oid
select @rowcount = @@ROWCOUNT

while (@rowcount > 0) begin
    -- Create a CSV of all object IDs in the batch, using the STUFF() function (http://goo.gl/EyE8L).
    select @csvQuery = 'select stuff((select distinct '','' + CAST(oid as varchar) from Testing..MyObjectIds where oid between ' + CAST(@startid as varchar) + ' and ' + CAST(@endid as varchar) + ' order by '','' + CAST(oid as varchar) for xml path('''')),1,1,'''')'


    -- Log the info and get the batch ID.   
    insert into @tblBatchRanges (oid_start, oid_end, csvQuery)
        values (@startid, @endid, @oidCSV, @csvQuery)

    select @batch_id = @@IDENTITY


    -- Advance @startid and @endid so that they point to the next batch
    select top(1) @startid = oid 
        from Testing..MyObjectIds
        where oid > @endid
        order by oid

    select top(@batchsize) @endid = oid 
        from Testing..MyObjectIds
        where oid > @endid
        order by oid

    select @rowcount = @@ROWCOUNT


    -- Export the current batch to a file.
    select @bcpFilename = 'MyExport-' + @nowstring + '-' + cast(@batch_id as varchar) + '.txt'
    select @bcpQuery = 'bcp "' + @csvQuery + '" QUERYOUT "' + @bcpTargetDir + @bcpFilename + '" -S ' + @csvQueryServer + ' -T -c'
    exec master..xp_cmdshell @bcpquery
end

SET NOCOUNT OFF


--Check all of the logged info.
select oid_start, oid_end, csvQuery from @tblBatchRanges

---

是的，在没有更优雅的解决方案的情况下，这就是我要走的方向。但是，我没有太多处理行数的经验，因此您的示例仍然非常有用：行数在其范围内越远，是否会逐渐变慢？Esp接近100k记录的结尾非常有趣-它直接导出到文件这一事实特别好。我还没有机会试一下，但今天下午我要试一试。太好了！这看起来很棒-我可以尝试将它与Adam的帖子结合起来，将输出直接导出到文本文件中。然而，我不理解下面的评论：注意：Top2000可能会以第514个id结束，如果这是最后一个id的话。你能解释一下吗？即使你要的是top2000，如果只剩下514条记录，那么最后一条记录就是514条。多行选择中的赋值是通过赋值给最后一行的值来工作的，因此@endid=pkid被赋值给最后一行的第514行的id，如果没有2000行。哦，我明白了-你的意思是，这就是你处理最后一批不完全包含2000行的情况的方式，对吗？@AspNyc-完全正确。第一批也可能是最后一批。

declare @startid int
declare @endid int

-- get one range, these are efficient as they go over the PKID key by range
select top(1) @startid = pkid from sometable order by pkid  -- 1 key visited
select top(2000) @endid = pkid from sometable order by pkid  -- 2000 keys visited
-- note: top 2000 may end up with the 514th id if that is the last one

while @@ROWCOUNT > 0
begin
    insert otherdb.dbo.backupcopy
    select * from sometable
    where pkid between @startid and @endid

    select top(1) @startid = pkid from sometable
    WHERE pkid > @endid -- binary locate
    order by pkid

    select top(2000) @endid = pkid from sometable
    WHERE pkid > @endid -- binary locate, then forward range lookup, max 2000 keys
    order by pkid
end

use Testing
GO

SET NOCOUNT ON

declare
    @now datetime = GETDATE(), 
    @batchsize int = 2000, 
    @bcpTargetDir varchar(500) = '\\SomeServer\Upload\', 
    @csvQueryServer varchar(500) = '.\SQLExpress', 

    @rowcount integer, 
    @nowstring varchar(100), 
    @batch_id int, 
    @startid int, 
    @endid int, 
    @oidCSV varchar(max), 
    @csvQuery varchar(max), 
    @bcpFilename varchar(200), 
    @bcpQuery varchar(1000)

declare @tblBatchRanges table (
    batch_id integer NOT NULL IDENTITY(1,1) PRIMARY KEY, 
    oid_start integer NOT NULL, 
    oid_end integer NOT NULL, 
    csvQuery varchar(max)
)

-- Create a unique timestamp-based string, which will be used to name the exported files.
select @nowstring = CONVERT(varchar, @now, 112) + '-' + REPLACE(CONVERT(varchar, @now, 114), ':', '')


-- 
select top(1) @startid = oid from Testing..MyObjectIds order by oid
select top(@batchsize) @endid = oid from Testing..MyObjectIds order by oid
select @rowcount = @@ROWCOUNT

while (@rowcount > 0) begin
    -- Create a CSV of all object IDs in the batch, using the STUFF() function (http://goo.gl/EyE8L).
    select @csvQuery = 'select stuff((select distinct '','' + CAST(oid as varchar) from Testing..MyObjectIds where oid between ' + CAST(@startid as varchar) + ' and ' + CAST(@endid as varchar) + ' order by '','' + CAST(oid as varchar) for xml path('''')),1,1,'''')'


    -- Log the info and get the batch ID.   
    insert into @tblBatchRanges (oid_start, oid_end, csvQuery)
        values (@startid, @endid, @oidCSV, @csvQuery)

    select @batch_id = @@IDENTITY


    -- Advance @startid and @endid so that they point to the next batch
    select top(1) @startid = oid 
        from Testing..MyObjectIds
        where oid > @endid
        order by oid

    select top(@batchsize) @endid = oid 
        from Testing..MyObjectIds
        where oid > @endid
        order by oid

    select @rowcount = @@ROWCOUNT


    -- Export the current batch to a file.
    select @bcpFilename = 'MyExport-' + @nowstring + '-' + cast(@batch_id as varchar) + '.txt'
    select @bcpQuery = 'bcp "' + @csvQuery + '" QUERYOUT "' + @bcpTargetDir + @bcpFilename + '" -S ' + @csvQueryServer + ' -T -c'
    exec master..xp_cmdshell @bcpquery
end

SET NOCOUNT OFF


--Check all of the logged info.
select oid_start, oid_end, csvQuery from @tblBatchRanges