Re： Re: Can not decompress a compressed string under plpy!

> > Hi,
> > I have stored a compressed string in a table field.
> > The compressed string is created by zlib using python.
> > I want to decompress this string by zlib under plpy but plpy fails to do
> > so. Is plpy not support decompression? Why?
> >
> > Thanks!
>
> A bit more information is required. What version of Postgres are you using,
what
> OS? I am guessing that the compressed string is being created by a Python
> program external to the database and then inserted into a field, is this
> correct? You are then trying to decompress the string via a plpythonu
function
> within the database,correct? Did you import the zlib module into the
plpythonu
> function?
>
> --
> Adrian Klaver
> aklaver(at)comcast(dot)net
>

Yes, most of your guess is correct.
I'm using postgresql 8.3.x and ms windows 2000.
The compressed string is saved to the table in binary
format using the psycopg. I had set the table field to bytea data type.
I want to use the plpythonu to decompress the stored
string.
Althout I imported the zlib module, it still failed.
I can successfully get back the decompressed string if
I use the psycopg either inside or outside the plpythonu.
But if without psycopg, plpythonu itself can not decompress the string.
I can use the psycopg inside the plpythonu but I must need to write security information (including user
name,password,server ip,port number,...) to the connection string inside plpythonu too.
This is a problem.

Thanks!