We help IT Professionals succeed at work.

Check out our new AWS podcast with Certified Expert, Phil Phillips! Listen to "How to Execute a Seamless AWS Migration" on EE or on your favorite podcast platform. Listen Now

x

T-SQL writing a blob to an external file

Medium Priority
1,051 Views
Last Modified: 2012-05-07
Having just figured out how to use OPENROWSET(BULK '...', SINGLE_BLOB) to read binary data from the file system into my SQL Server database, I now need to do the opposite:

Given an "image" type column in a table, I need T-SQL script to write this to a file somewhere on the file system. Again, ideally as NATIVE as possible.

(dang - why are examples of this so hard to find?)

So imagine your select statement to get the blob is

SELECT [data] from [dbo].[blobtable] where [id] = 5

the [data] happens to represent a JPG, so what I need is a wee bit o' T-SQL code that will write [data] out of the above select to 'C:\test.jpg'

many thanks
Comment
Watch Question

Guy Hengel [angelIII / a3]Billing Engineer
CERTIFIED EXPERT
Most Valuable Expert 2014
Top Expert 2009

Commented:
there are some methods:
http://www.sqlservercentral.com/articles/Miscellaneous/writingtoafileusingthesp_oacreatestoredprocedurean/1694/

note: the methods all write TEXT, however the ones with vbscript or sp_oaxxxx methods should be easily modifiable to write binary data.

Author

Commented:
:-(

I'm not sure it would be easy to modify them to write binary data. The only way I can imagine that would work is by using an ADODB.Stream - however in that case I would at some stage need to store the data locally in a variable of a binary type, and SQL Server dinnae like that?
Unlock this solution and get a sample of our free trial.
(No credit card required)
UNLOCK SOLUTION

Author

Commented:
damn. It involves invoking an external .exe but at least it's "native":

bcp "SELECT BULKCOLUMN from OpenRowSet(BULK 'somefile', SINGLE_BLOB) DMSData" queryout yetanotherfile -U someusername -P itspassword -n

Author

Commented:
obviously instead of the OpenRowSet I used above you can select a blob from another table
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a sample view!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.