python: how to convert a valid uuid from String to UUID?
Just pass it to uuid.UUID: import uuid o = { “name”: “Unknown”, “parent”: “Uncategorized”, “uuid”: “06335e84-2872-4914-8c5d-3ed07d2a2f16” } print uuid.UUID(o[‘uuid’]).hex
uuid
UUID performance in MySQL?
At my job, we use UUID as PKs. What I can tell you from experience is DO NOT USE THEM as PKs (SQL Server by the way). It’s one of those things that when you have less than 1000 records it;s ok, but when you have millions, it’s the worst thing you can do. Why? … Read more
Generating 8-character only UUIDs
It is not possible since a UUID is a 16-byte number per definition. But of course, you can generate 8-character long unique strings (see the other answers). Also be careful with generating longer UUIDs and substring-ing them, since some parts of the ID may contain fixed bytes (e.g. this is the case with MAC, DCE … Read more
How big is the chance to get a Java UUID.randomUUID collision? [duplicate]
According to wikipedia, regarding the probability of duplicates in random UUIDs: Only after generating 1 billion UUIDs every second for the next 100 years, the probability of creating just one duplicate would be about 50%. Or, to put it another way, the probability of one duplicate would be about 50% if every person on earth … Read more
I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
There are plenty of options, I recommend not to add additional dependencies and use SecureRandom which is builtin: SecureRandom.uuid #=> “1ca71cd6-08c4-4855-9381-2f41aeffe59c” See other possible formats here.
Using a UUID as a primary key in Django models (generic relations impact)
As seen in the documentation, from Django 1.8 there is a built in UUID field. The performance differences when using a UUID vs integer are negligible. import uuid from django.db import models class MyUUIDModel(models.Model): id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False) You can also check this answer for more information.
Is there any way to generate the same UUID from a String
You can use UUID this way to get always the same UUID for your input String: String aString=”JUST_A_TEST_STRING”; String result = UUID.nameUUIDFromBytes(aString.getBytes()).toString();
How to Create Deterministic Guids
As mentioned by @bacar, RFC 4122 ยง4.3 defines a way to create a name-based UUID. The advantage of doing this (over just using a MD5 hash) is that these are guaranteed not to collide with non-named-based UUIDs, and have a very (very) small possibility of collision with other name-based UUIDs. There’s no native support in … Read more
How to generate unique id in Dart
1. There is a UUID pub package: http://pub.dartlang.org/packages/uuid example usage: import ‘package:uuid/uuid.dart’; // Create uuid object var uuid = Uuid(); // Generate a v1 (time-based) id uuid.v1(); // -> ‘6c84fb90-12c4-11e1-840d-7b25c5ee775a’ // Generate a v4 (random) id uuid.v4(); // -> ‘110ec58a-a0f2-4ac4-8393-c866d813b8d1’ // Generate a v5 (namespace-name-sha1-based) id uuid.v5(uuid.NAMESPACE_URL, ‘www.google.com’); // -> ‘c74a196f-f19d-5ea9-bffd-a2742432fc9c’ 2. This src has … Read more
How to determine if a string is a valid v4 UUID? [duplicate]
I found this question while I was looking for a Python answer. To help people in the same situation, I’ve added the Python solution. You can use the uuid module: #!/usr/bin/env python from uuid import UUID def is_valid_uuid(uuid_to_test, version=4): “”” Check if uuid_to_test is a valid UUID. Parameters ———- uuid_to_test : str version : {1, … Read more