Insert binary file into bytea where PG server does not have access to the file ?

On 12/3/21 12:13, David Gauthier wrote:

11.5 on linux

Big corp with an IT dept providing us with PG DBs running in instances
on their servers. (We/I amd not DBA).    We on the client side, the
"users" of these DBs, want to load binary files into bytea type
columns.  But the files we want to load are on disks that the server
does not have access to.

I googled around for a solution.  This failed...

insert into test_bytea (id,data) values
(1,pg_read_binary_file('/top/next.whatever/xyz.bin')::bytea);

ERROR:  could not stat file "/top/next.whatever/xyz.bin": No such file
or directory

Understandable because the server hasn't even mounted /top.

Is there a way to do what I want from the client side ?

Are you using some client side language(Java, Python, etc) library?

They generally have a way to deal with this:

Python via psycopg2:

https://www.psycopg.org/docs/usage.html#adapt-binary

Java via JDBC:

https://jdbc.postgresql.org/documentation/head/binary-data.html

If the file is transformed into some titanic string on the client side,
then passed along over the net to the server in the insert statement, is
there a max string length that I need to worry about ?

Thanks

--
Adrian Klaver
adrian.klaver@aklaver.com

On 12/3/21 12:42, David Gauthier wrote:
Please reply to list also.
Ccing list

Ya, perl, how about perl ?

That would depend on what Perl database driver you are using.

Assuming DBD::Pg:

https://metacpan.org/pod/DBD::Pg

Then search on binary.

Folks with Perl experience can provide more detailed information.

--
Adrian Klaver
adrian.klaver@aklaver.com