Subject: Re: insert DEFAULT value
To: Hans Ginzel <hans@matfyz.cz>, psycopg@postgresql.org
References: <20210303215137.GI11758@artax.karlin.mff.cuni.cz>
From: Adrian Klaver <adrian.klaver@aklaver.com>
Message-ID: <05f8e563-162a-3a86-d939-7fb7f03811e6@aklaver.com>
Date: Wed, 3 Mar 2021 15:23:28 -0800
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On 3/3/21 1:51 PM, Hans Ginzel wrote:
> How to insert DEFAULT value, please?
> 
> import psycopg2
> from psycopg2.sql import DEFAULT    # 
> https://www.postgresql-archive.org/Inserting-default-values-into-execute-values-td6130148.html 
> 
> 
> db = psycopg2.connect(host='host', dbname='db')
> cursor = db.cursor()
> cursor.execute("DROP TABLE IF EXISTS test_default")
> cursor.execute("CREATE TABLE test_default(i int NOT NULL DEFAULT 1)")
> cursor.execute("INSERT INTO test_default VALUES (%s)", (DEFAULT,))
> 
> cursor.execute("DROP TABLE IF EXISTS test_default")
> cursor.execute("CREATE TABLE test_default(j jsonb NOT NULL DEFAULT 
> '{}'::jsonb)")
> cursor.execute("INSERT INTO test_default VALUES (%s)", (DEFAULT,))
> 
> For both cases I get
> psycopg2.ProgrammingError: can't adapt type 'SQL'

You need to do something like:

cur.execute(sql.SQL("INSERT INTO test_default VALUES ({})").format(DEFAULT))

> 
> Thank you in advance,
> HG
> 
> 


-- 
Adrian Klaver
adrian.klaver@aklaver.com