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From: Stephen Lagree <[email protected]>
To: [email protected]
Subject: Inserting default values into execute_values
Date: Tue, 31 Mar 2020 15:27:05 -0700
Message-ID: <CADkZaxXqU+c6_GnW_L0SOgc63iYHomm0RVSpb_+Kww5scVyA4w@mail.gmail.com> (raw)

Hello,

I am trying to insert into a table to generate sequential ids.  Is there a
way to do this repeatedly using execute_values if there is only one column
and it is auto incremented?
It seems the execute_values requires at least one non-default value.

I am trying to do this:
    query = "INSERT INTO MYTABLE (id) VALUES (DEFAULT) RETURNING id;"
    execute_values(cursor, query, args_list, template=None, page_size=100,
fetch=True)

If I don't use a %s argument and just put dummy values in the arglist, I
get error
E           ValueError: the query doesn't contain any '%s' placeholder
I understand why this doesn't work because it can't extract the placeholder
and replicate values there.

If I change DEFAULT to %s and try to use blank tuples I get this
E           psycopg2.errors.SyntaxError: syntax error at or near ")"
E           LINE 1: INSERT INTO MYTABLE (id) VALUES (),(),() RETURNING id;

If I use "DEFAULT" as a string it tries to insert a string into an int
column, not use the DEFAULT value.  Is there a way to insert the default
value here?  I don't see anything like this in the documentation.

My table looks like this:
"CREATE TABLE MYTABLE (id SERIAL PRIMARY KEY)"

Thanks,
Steve

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