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Work with compressed data in BLOB-field (SPIS, tcompress)

Posted on 2009-04-08
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I have to work with a database which is filled by a third party program.

It seems that part of the contents (also text contents) is stored in a BLOB-field (of type 'image') where it is compressed with (as far as I could find out) tcompress.

Data in a field typically start with "0x535049531A4C4835" which could be read as "SPISLH5". Searching for that I found something about tcompress.  

This is something new for me, and searches on internet did not bring me much information. Can someone provide me with some more information about this.

* How can I extract information in these fields to readable text (I am quite sure there is text in it)
* Are there any tools to enable querying such fields, or should I just forget about that.




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Question by:sybe
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udaya kumar laligondla earned 1000 total points
ID: 24096042
I have to work with a database which is filled by a third party program.

It seems that part of the contents (also text contents) is stored in a BLOB-field (of type 'image') where it is compressed with (as far as I could find out) tcompress.

Data in a field typically start with "0x535049531A4C4835" which could be read as "SPISLH5". Searching for that I found something about tcompress.  

This is something new for me, and searches on internet did not bring me much information. Can someone provide me with some more information about this.

* How can I extract information in these fields to readable text (I am quite sure there is text in it)
* Are there any tools to enable querying such fields, or should I just forget about that.

you have to write an application to read the contents of the blob field.
the follwoing article explains how to read the field data
http://www.akadia.com/services/dotnet_read_write_blob.html
then you need to decompress the the contents using tcompress. you can get the tcompress component and documentation at
http://webcentre.co.nz/compress.htm
you can not do this in TSQL
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by:sybe
ID: 24107897
I hoped for something more then just some links. Blobs are not new for me.

But the documentation for TCompress is for Delphi applications. I am using asp.net, and it seems unusable with vb.net or c#.
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