def run_migrations_online():
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    set_mysql_engine()
    engine = session.create_engine(neutron_config.database.connection)

    connection = engine.connect()
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        include_object=include_object,
        version_table=alembic_migrations.VERSION_TABLE
    )

    try:
        with context.begin_transaction():
            context.run_migrations()
    finally:
        connection.close()
        engine.dispose()
Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.