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Out of Memory: How to save and read files stored as FileStream in SQL Server 2008 from MS Access 2007 vba ?

Posted on 2016-08-25
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Last Modified: 2016-08-26
I have been succesful using the procedure outline in:

https://www.experts-exchange.com/questions/26923910/How-to-save-and-read-files-stored-as-FileStream-in-SQL-Server-2008-from-MS-Access-2007-vba.html

The issue is that if it file is large, and for me, that was a file in the 100 MB range (50 MB is no issue), I get an out of memory problem at line 18: rs!FS = objStream.Read

I have plenty of RAM (4 GB free), so it isn't that simple.  I have tried adUseClient and adUseServer, but both a memory error, although the error messages read a bit different.

Do I need to somehow write the file in chunks < 100 MB?  If so, how?
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Question by:Airmaster
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aikimark earned 500 total points
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You might have to read and append the stream in chunks.
There is a parameter you can specify on the ADODB.STREAM Read() method for the number of bytes you want to read.
https://msdn.microsoft.com/en-us/library/ms676702(v=vs.85).aspx

Depending on the recordset field, you might be able to use the APPENDCHUNK method
https://msdn.microsoft.com/en-us/library/ms678268(v=vs.85).aspx
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by:Airmaster
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Thanks, I will give that a shot.  I noticed the Read doesn't specify an offset, just the # of bytes to read.  If so, how do I specify the next set of bytes to read?

Also an odd note AppendChunk Method
The AppendChunk method does not operate on Field objects of a Record Object (ADO) object. It does not perform any operation and will produce a run-time error.
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by:aikimark
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I read that too.  Not sure how/if it applies.

The way a stream behaves should be like a file open, your read operation leaves you positioned some place in the file, ready for the next read operation.
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Author Comment

by:Airmaster
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Okay, works just fine.  Here are the changes I made to the original code listing.

Dim varStreamTemp As Variant, lngMaxBytes As Long

lngMaxBytes = 1000000
varStreamTemp = objStream.Read(lngMaxBytes)
Do Until IsNull(varStreamTemp)
  rs("FS").AppendChunk varStreamTemp
  varStreamTemp = objStream.Read(lngMaxBytes)
Loop  

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Maybe there is a more elegant way of doing it, but works.

I think the Microsoft documentation is misleading/not specific enough.
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by:Airmaster
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Unless you have any other great comments, I will close this out.
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by:aikimark
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glad this worked for you
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by:Airmaster
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Just as an additional comment, on the original code, it asks you to do a

rs.Open "Select * from FSTest", con, adOpenDynamic, adLockOptimistic

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After adding that big file, the server ran to a crawl when encountering the embeded document.  This happened even if I ran it the SELECT from SQL Server Management Studio.

I got back that by replacing it with

rs.Open "Select TOP 1 * from FSTest", con, adOpenDynamic, adLockOptimistic

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