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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Igor Korot <ikorot01@gmail.com>
Cc: pgsql-generallists.postgresql.org <pgsql-general@lists.postgresql.org>
Subject: Re: Double prepare
Date: Sat, 16 May 2026 09:46:27 -0400
Message-ID: <1495292.1778939187@sss.pgh.pa.us> (raw)
In-Reply-To: <CA+FnnTycS2E-Bb7Wm+-mmTXwRQ-t4Wyfg=S2Upysf-zF0ty_2w@mail.gmail.com>
References: <CA+FnnTycS2E-Bb7Wm+-mmTXwRQ-t4Wyfg=S2Upysf-zF0ty_2w@mail.gmail.com>

Igor Korot <ikorot01@gmail.com> writes:
> Is there a way to see if the query has been prepared already (in libpq)?

Use the pg_prepared_statements view.  I don't think libpq keeps any
client-side state about this.

> Or is it better to run PQprepare for all known parameterized queries
> in the very beginning of the program and just execute them when needed?

Very probably.  Querying pg_prepared_statements every time would be
expensive.

			regards, tom lane

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