It is a CGI (shell) script that is calling a C program. I found the issue -
which was external to Postgres.
I still have one remaining question - if the COPY to FILE command fails,
does it return an error? If the program uses:
int i;
i = PQexec("copy from <<table_name>> to <<fully_qualified_file_name>>");
and the table has (for example) 500 records, but only 350 were copied to the
file, what is returned in i? Or is the only method to check that all the
data was exported correctly to wc -l the file and select count(*) to check
against what was supposed to be exported?
Thanks,
Kevin
From: Michael Fuhr <mike@xxxxxxxx>
To: Kevin Keith <kevinrkeith@xxxxxxxxxxx>
CC: pgsql-admin@xxxxxxxxxxxxxx
Subject: Re: Copy command not writing complete data to text file
Date: Thu, 22 Sep 2005 08:52:36 -0600
On Thu, Sep 22, 2005 at 08:27:00AM -0500, Kevin Keith wrote:
> The platform is Free BSD, Postgres version 7.4.5 and the program
triggering
> the COPY command is a CGI script.
What language and API are you using? In the next paragraph you
mention PQexec(), which implies C or C++ and libpq (some people
argue that a C/C++ program isn't a "script," so that word could be
misleading).
> I am copying out to a text files using PQexec - there are no more than
500
> records in the tables being copied. What is happening, is one instance
of
> the COPY command is always stopping after dumping 16,384 bytes (16K) to
the
> text file - the last record is always truncated (i.e. the if the table
has
> 20 columns, the last record may only have 7 columns in the flat file).
> There is also no error returned in the program - to the program calling
the
> copy command everything gives an appearance of working.
Could you post the code that does the COPY and error checking?
Better yet, a short but complete program that exhibits the problem.
> What makes this problem difficult to resolve is that if I run the exact
> same COPY command from the PSQL prompt, everything works with no
problems.
Does the CGI program behave differently if you run it from the
command line instead of through the web server?
--
Michael Fuhr
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