psycopg2: insert multiple rows with one query

Question

I need to insert multiple rows with one query (number of rows is not constant), so I need to execute query like this one:

INSERT INTO t (a, b) VALUES (1, 2),         


        

Answer 1

If you're using SQLAlchemy, you don't need to mess with hand-crafting the string because SQLAlchemy supports generating a multi-row VALUES clause for a single INSERT statement:

rows = []
for i, name in enumerate(rawdata):
    row = {
        'id': i,
        'name': name,
        'valid': True,
    }
    rows.append(row)
if len(rows) > 0:  # INSERT fails if no rows
    insert_query = SQLAlchemyModelName.__table__.insert().values(rows)
    session.execute(insert_query)