Re: decoding BLOB's

On 02/22/2016 11:08 AM, CS DBA wrote:
> Hi All;
>
> we've found a post about dumping blobs:
> /
> /
>
> /I wrote: [fanlijing wants to write bytea to file] > A simple > COPY
> (SELECT byteacol WROM mytab WHERE ...) TO 'filename' (FORMAT binary) >
> should do the trick. Corrections: a) "binary" must be surrounded by
> single quotes. b) *that won't dump just the binary data - you would have
> to remove the first 25 bytes and the last 2 bytes...* So maybe using the
> functions I mentioned would be the best way after all. You could also
> write your own user defined function in C. /
>
>
>
> Can someone point me in the right direction per how I would remove the
> first 25 bytes and the last 2 bytes from a bytea column?

http://www.postgresql.org/docs/9.3/static/functions-binarystring.html

Substring might do it for you.

JD

>
> Thanks in advance
>
>


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