def run_migrations_offline():
    """Run migrations in 'offline' mode.

    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the
    script output.

    """
    # for the --sql use case, run migrations for each URL into
    # individual files.

    engines = {}
    for name in re.split(r',\s*', db_names):
        engines[name] = rec = {}
        rec['url'] = context.config.get_section_option(name,
                                                       "sqlalchemy.url")

    for name, rec in engines.items():
        logger.info("Migrating database %s" % name)
        file_ = "%s.sql" % name
        logger.info("Writing output to %s" % file_)
        with open(file_, 'w') as buffer:
            context.configure(url=rec['url'], output_buffer=buffer,
                              target_metadata=target_metadata.get(name),
                              literal_binds=True)
            with context.begin_transaction():
                context.run_migrations(engine_name=name)
dataset/ETHPy150Open quantmind/lux/lux/extensions/odm/commands/template/lux/env.py/run_migrations_offline/original