hmset method
Sets the specified fields to their respective values in the hash stored at key. This command overwrites any specified fields already existing in the hash. If key does not exist, a new key holding a hash is created.
True, if the operation was successful.
Implementation
Future<void> hmset(String key, Map<String, String> keysAndValues) async {
(await tier1.hmset(key, keysAndValues)).toSimpleString();
}