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Re: libpq - check PGconn* - is it valid

From: Terry Lee Tucker <terry(at)leetuckert(dot)net>
To: pgsql-interfaces(at)postgresql(dot)org
Subject: Re: libpq - check PGconn* - is it valid
Date: 2006-10-11 16:11:07
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-interfaces
On Wednesday 11 October 2006 11:33 am, Dmitriy Chumack <saint(at)apriorit(dot)com> 
thus communicated:
>  Hi everyone.
>  I have such a problem. My application, some server, use libpq librarry
>  to interact with PostgreSQL-8.1.0 database. Postgresql server and my
>  server work on different computers in the local network. When my server
>  starts, it creates pool of 10 connections to database. My server use
>  PQexec() to submit queries to db. But when there is no network
>  connection to the database (I simply unplug the network cable from
>  computer on which PG server is run) and my server calls PQexec() -
>  than it hangs in PQexec() call. And it will hang there for a very
>  long time (I wait about 30 minutes and there is no result). And
>  when I plug in the network cable back, PQexec() remains hanging (I
>  wait about 10 minutes and there is no result too).
>  I use simply (not ssl) connection to db.
>  So how can I check PGconn pointer if it represent a health connection
>  to prevent my server to hang in PQexec() call?
>  Thanks in advance.

Use: ConnStatusType PQstatus(const PGconn *conn);
See the docs for details.
Terry Lee Tucker
Turbo's IT Manager
Turbo, division of Ozburn-Hessey Logistics
2251 Jesse Jewell Pkwy NE
Gainesville, GA 30501
Tel: (336) 372-6812  Fax: (336) 372-6812  Cell: (336) 363-4719

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