code: def run_migrations_offline():
      
      # for the --sql use case, run migrations for each URL into
      # individual files.
  
      engines = {
          '': {
              'url': context.config.get_main_option('sqlalchemy.url')
          }
      }
      for name in bind_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 or '<default>'))
          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=get_metadata(name),
                  literal_binds=True,
              )
              with context.begin_transaction():
                  context.run_migrations(engine_name=name)
docs: 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.