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Connect to a PostgreSQL-Server by TCP/IP

From: Fischer Ulrich <ulrich(dot)fischer(at)aerodynamics(dot)ch>
To: pgsql-interfaces(at)postgresql(dot)org
Subject: Connect to a PostgreSQL-Server by TCP/IP
Date: 2005-06-22 15:37:58
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-interfaces

I'm new in this List.
I would like to connect to a Postgres-Server by a LabView-Client. The 
problem is, there is NO odbc-driver for LV on Linux and no LV-interface 
to postgreSQL.
So I decided to make my own simple LabView driver. Are there some docs, 
which describes the basic communication over a tcp connection between 
the postgres server and a client? I'm interested in 'message 
architecture' (header, data for login, sql-querys and so on...) and all 
this stuff.
I tried some backward engineering by sniffing the tcp connection, but it 
is rather anoying. It looks like the messages have some binary headers 
and they are a problem....

Has anybody an idea? Thanks for your help!!!


Sniffing the communication between a running perl-script (DBI) and postgres:

open tcp connection ..ok
client request .......296 bytes (???)
Postgres response ....1 byte (4e)
client request .......296 bytes (including dbname username in
Postgres response ....5 bytes (52 00 00 00 03)
client request .......14 bytes (including password in ascii)
Postgres response ....15 bytes (52 00 00 00 00 4b  00 00 78 6f 0c 43 eb 
70 5a)
client request .......44 bytes (Qbegin ; select getdatabaseencoding();
Postgres response ....79 bytes (CBEGIN Pblank getdatabaseencoding
                       SQL_ASCIICSELECT CCOMMIT)
client request .......60 bytes (Qselect pid, name, vorname from
                       mitarbeiter where pid= 'fiu')
Postgres response ....96 bytes (Pblank pid name Dvorname fiu Fischer
client request .......1 byte (58)

Ulrich G. Fischer                       Dipl. Natw. ETH
Center Aerodynamics                     Ruag Aerospace
P.O. Box 301                            CH-6032 Emmen
Tel. +41 41 268 23 53                   Fax. +41 41 268 38 97


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Next:From: Tom LaneDate: 2005-06-22 15:51:30
Subject: Re: Connect to a PostgreSQL-Server by TCP/IP
Previous:From: Greg Sabino MullaneDate: 2005-06-22 01:57:59
Subject: Version 1.42_1 (1.43 beta) of DBD::Pg uploaded to CPAN

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