Psycopg2 returns none when execute many is combined with returning id

问题

I want to insert many values into a table using execute_values. I also need the ids of the affected rows. I want to use RETURNING id. I have set the fetch flag. Still, the result is None.

• postgres 11
• python 3.6.9
• psycopg2 '2.8.3 (dt dec pq3 ext lo64)'

I create a table with

CREATE TABLE dummy_table (
    id serial,
    name text,
    age int
);

The values and query are

values = [('bob', 10), ('alice', 12)]
query = 'INSERT INTO dummy_table (name, age) VALUES %s RETURNING id;'

I call execute values like this

result = psycopg2.extras.execute_values(cursor, query, values, fetch=True)
connection.commit()
print(result)
> None

What am I doing wrong?

来源：https://stackoverflow.com/questions/59085374/psycopg2-returns-none-when-execute-many-is-combined-with-returning-id