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libpq or ESQL

From: Atif Jung <atifjung(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: libpq or ESQL
Date: 2010-03-03 15:45:59
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
We are migrating from INFORMIX to POSTGRES;

Currently we use the following code (for both INFORMIX and POSTGRES,) to
connect to the database:


If we need to cancel an SQL request in INFORMIX we call;


This interrupts the database server and cancels any SQL statement currently

As I understand it POSTGRES uses the libpq functions of:

PQgetCancel, PQfreeCancel and PQcancel.

However if we've used the above 'CONNECT TO' method to connect to the
database we don't have a PGconn connection object which is used by

My question is therefore, should we be using libpq C function PQconnectdb to
connect to the database which will return us the PGconn connection object to
use in PGgetCancel, or is there anotherway to interrupt the database server?

I should note that this is a multi-threaded application running on AIX 6.1.
The WARNING box in the POSTGRESQL guide says that "On Uunix, forking a
process with open libpg connections can lead to unpredictable results..." If
this is the case how should the database server be interrupted?

Thanks to all in advance.


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Subject: sql query on multiple contains
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