Horton

Re: Retrieving query results

Michael Paquier <michael.paquier@gmail.com>

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From: Michael Paquier <michael.paquier@gmail.com>
To: Igor Korot <ikorot01@gmail.com>
Cc: pgsql-general <pgsql-general@postgresql.org>
Date: 2017-08-23T00:32:54Z
Lists: pgsql-general 
On Wed, Aug 23, 2017 at 3:19 AM, Igor Korot <ikorot01@gmail.com> wrote:
> [quote]
> PQntuples
>
> Returns the number of rows (tuples) in the query result. Because it
> returns an integer result, large result sets might overflow the return
> value on 32-bit operating systems.
>
> int PQntuples(const PGresult *res);
>  [/quote]
>
> Is there another way to not to overflow the result?

Not really with the existing API. Note that getting at 2 billion rows
is really a lot, and would cause performance issues on the application
side because a bunch of data would need to be processed, and getting
out this much data is not network-wise anyway.
-- 
Michael

Commits

  1. Doc: document libpq's restriction to INT_MAX rows in a PGresult.

  2. Teach libpq to detect integer overflow in the row count of a PGresult.