python - 如何在 SQLAlchemy 中的 python 中回滚 dataframe.to_sql？

Question

engine = create_engine('postgresql://username:password@host:5432/database')
transactions.to_sql('transactions', engine,if_exists='append',index=False,method='multi')

如何回滚？

Answer 1

您可以在调用 to_sql 之前开始事务，然后再进行回滚:

import pandas as pd
import sqlalchemy as sa

engine = sa.create_engine("mssql+pyodbc://@mssqlLocal64")

def dump_tran_test_table(conn):
    print(conn.execute(sa.text("SELECT * FROM tran_test")).fetchall())

# set up test environment
with engine.begin() as conn:
    conn.exec_driver_sql("DROP TABLE IF EXISTS tran_test")
    conn.exec_driver_sql(
        "CREATE TABLE tran_test "
        "(txt varchar(10), id int primary key)"
    )
    conn.exec_driver_sql(
        "INSERT INTO tran_test (txt, id) VALUES "
        "('old_foo', 1), ('old_bar', 2)"
    )

# test
with engine.connect() as conn:
    tran = conn.begin()
    df = pd.DataFrame([("new_baz", 3)], columns=["txt", "id"])
    df.to_sql("tran_test", conn, index=False, if_exists="append")
    dump_tran_test_table(conn)
    """console output:
    [('old_foo', 1), ('old_bar', 2), ('new_baz', 3)]
    """
    tran.rollback()
    dump_tran_test_table(conn)
    """console output:
    [('old_foo', 1), ('old_bar', 2)]
    """