To: "pgsql-sql@postgresql.org" <pgsql-sql@postgresql.org>
From: Sebastien FLAESCH <sf@4js.com>
Subject: Determining the DATE format with libpq
Organization: Four Js Development Tools
Message-ID: <46935bcd-5754-9deb-fc63-8162bcdd4c46@4js.com>
Date: Thu, 24 Aug 2017 17:21:55 +0200
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Hi all,

The date format can be defined with SET DateStyle.

When fetching result set values using the libpq C API, we get plain text from PQgetvalue(), representing a date in the current format.

We need to extract date parts (year/month/day) to fill our own DATE type structure...

Is there a way to know the current date format used in the SQL session?

Ideally, we expect a libpq API.

We cannot do a "SHOW DateStyle" each time we executing a SELECT!

Other DB client C APIs provide a C structure to hold DATE values so it's easy to get year/month/day parts.

Seb


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