Issue with BCP Exported File and How to Fix It.


Using bcp to export binary data from column varbinary(max) to file system is easy enough.
But when you try to open these files, you may run into problems.
The problem is that bcp added 8 bytes to the exported file when you use -n flag.
To change this behavior, you need to use format file to rescue.

Create a dummy table with one varbinary(max) column and use this table to create a format file.
You can use either fmt or xml format as your format file.
Modify this generated format file and change the 8 in the third column to 0 and save it.
The final step is to use this format file for your bcp export.

 

 if object_id('mytemp1','U') is not null
drop table mytemp1 

create table mytemp1 ( ABinaryCol varbinary(max))

DECLARE @cmd VARCHAR(4000)
set @cmd = 'BCP  [mydb1].[dbo].[mytemp1] format nul -f "C:\temp\myFormatFile1.xml" -n -T -S'+ @@servername
exec master..xp_cmdshell @cmd

 

12.0
1
1 SQLBINARY 8 0 “” 1 ABinaryCol “”

Change to:

12.0
1
1 SQLBINARY 0 0 “” 1 ABinaryCol “”
The final bcp:

  

declare @name varchar(300)='myfile.doc'
declare @Command VARCHAR(4000) 

SET @Command = 'bcp "select datacol from  db.[dbo].[datatable] where id =1 queryout "c:\temp\' + @name + '" -f "C:\temp\myFormatFile1.xml" -T  -S '+ @@servername  ;

   -- PRINT @Command
EXEC xp_cmdshell @Command,NO_OUTPUT

 

http://stackoverflow.com/questions/27301763/sql-server-bcp-export-corrupted-file

 

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