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From: Christophe Pettus <[email protected]>
To: Denis Laxalde <[email protected]>
Cc: Daniele Varrazzo <[email protected]>
Cc: [email protected]
Subject: Re: about client-side cursors
Date: Thu, 4 Feb 2021 06:44:07 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CA+mi_8a1ery2xvb+AdxMtVXydOdGC7wRMnfXNAvk8v73HsLFyw@mail.gmail.com>
	<[email protected]>



> On Feb 4, 2021, at 03:16, Denis Laxalde <[email protected]> wrote:
> But, unless I missed it, the PEP does not state how to implement query
> execution and result fetch operations if the database does not need a
> cursor.

First, any change like this would have to maintain their current API essentially forever, unless psycopg3 represents a completely incompatible break with the psycopg2 interface.  There is an enormous body of code out there that uses the current cursor() interface for client-side cursors.

Second, it would be very unwise to make guarantees about when these operations interact with the database.  I think that any client application should expect that both cursor.execute() and cursor.fetchone()/.fetchall() are asynchronous operations, and code appropriately.
--
-- Christophe Pettus
   [email protected]

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