Re: Save and load jpg in a PostgreSQL database

I use Large Objects for my images (and any binary file type). there's
section in the PostgreSQL docs on it. In php, I need to get the oid
from pg_lo_import($conn, $imagefile) then manage an index table that
has a list of my images:

INSERT INTO images (filename, mimetype, datetime, image) VALUES
('$filename','$mimetype', $imagedate, $oid);

(I know you aren't useing php; this is just an example)

I can't help with your imageBox question :(

________________________________

From: pgsql-general-owner(at)postgresql(dot)org
[mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of lfmartinelli
Sent: 2010 November 5 2:46 PM
To: pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] Save and load jpg in a PostgreSQL database

Hey Dmitriy,

I'm using Visual Studio 2010 system.data.odbc becouse this worked good
and i tested psqlodbc lib to .Net, but i don't find any advantage to use
this.
In a Brazilian forum, i read a post and it was written:

-" Just use this line: INSERT INTO table (image) VALUES
(pg_escape_bytea(image.jpg))".

Changing "image.jpg" to my image file, the PostgreSQL already convert
this and save in a database.
Is this true? And how can i load this to imageBox in my system? Which
type must be declared my variable?

Thanks to your help.

Em 04/11/2010 15:40, Dmitriy Igrishin [via PostgreSQL] escreveu:

Hey Fernando,

If you need to store binary data in a table you should use bytea
data type.
Than, in case of libpq:
If you want to transmit binary data from client to server in
text format you
must prepare (escape) it for including into you SQL command
(e.g., INSERT).
If you can transmit the data from client to server in binary
format you don't
need escape you binary data, but you must tell libpq (or the
library you use)
that you transmission will be in a binary format.

What library do you use to work with PostgreSQL ?


2010/11/4 lfmartinelli <[hidden email]>

Hi,

My name is Fernando, i work with C# and PostgreSQL. I
need save a jpg in a
PostgreSQL table.
How do i this? I read in a forum to use this to save in
database:

INSERT INTO table (image) VALUES
(pg_escape_bytea(image.jpg))

Don't i need convert image file to binary before save in
a database?
How get i this image to a variable using c#?

Please help me!

Thanks.
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