sqlalchemy.exc.ArgumentError: list argument must contain only tuples or dictionaries

Question

I've been trying to use sqlalchemy to dump data into a mysql database. When I try to do this, it gives the error sqlalchemy.exc.ArgumentError: List arguments must contain only tuples or dictionaries . The following code is used for insertion.

def insert_data(db, table, rows):

    db.execute(f"INSERT INTO {table} VALUES (%s)", rows)
    db.commit()

The content in

rows is as follows.

[(1, 'asdsewadada', 'lajsdljasld', 'lol@gmail.com', 51)]

So, I'm inserting a list of tuples, but still getting the same error.

Answer 1

Starting with SQLAlchemy version 2, you should use dictionaries instead of tuples:

So this should fix your code:

def insert_data(db: sqlalchemy.engine.base.Engine, query: str, parameters: dict):
    log_headline: str = "insert_data() ::"
    """
    :param db:
    :param query: INSERT INTO votes (time_cast, candidate) VALUES (:time_cast, :candidate)
    :param parameters: {"time_cast": time_cast, "candidate": team}
    :return:
    """

    # Insert
    stmt = sqlalchemy.text(query)
    try:
        # Using a with statement ensures that the connection is always released
        # back into the pool at the end of statement (even if an error occurs)
        with db.connect() as conn:
            conn.execute(stmt, parameters=parameters)
            conn.commit()
        print(f"{log_headline} OK inserted data ")
    except Exception as e:
        # If something goes wrong, handle the error in this section. This might
        # involve retrying or adjusting parameters depending on the situation.
        print(f"{log_headline} Error {e}")