How to use the jardin.database.DatabaseConnections function in jardin

def wrapper(*args, **kwargs):
            if DatabaseConnections.connection('jardin_test').db_config.scheme in schemes:
                return func(*args, **kwargs)

def db(self, role='replica', db_name=None):
        name = db_name or self.db_names.get(role)
        return DatabaseConnections.connection(name)

def reset_session():
    DatabaseConnections.shuffle_connections()