dart-uuid
uuid7
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dart-uuid
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New UUID Formats from IETF
I maintain the Dart UUID library. For anyone using dart, or wants to see one of many implementations of v6,v7 and a custom v8 UUID, feel free to look at my in-progress branch linked below, I plan to merge it in once they add different string representations in a future draft (I've been involved in the conversations).
https://github.com/Daegalus/dart-uuid/tree/uuidv6
uuid7
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Sequential UUID in snowflake
Snowflake does not support UUID 7. What you could do is import UUID7 Python module and implement a Python UDF.
- New UUID Formats from IETF
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Understanding UUIDs, ULIDs and String Representations
To summarise the differences:
* UUIDv6 - sortable, with a layout matching UUIDv1 for backward compatibility, except the time chunks have been reordered so the uuid sorts chronologically
* UUIDv7 - sortable, based on nanoseconds since the Unix epoch. Simpler layout than UUIDv6 and more flexibility about the number of bits allocated to the time part versus sequence and randomness. The nice aspect here is the uuids sort chronologically even when created by systems using different numbers of time bits.
* UUIDv8 - more flexibility for layout. Should only be used if UUIDv6/7 aren't suitable. Which of course makes them specific to that one application which knows how to encode/decode them.
UUIDv7 is thus the better choice in general.
(I recently wrote Python and C# implementations - https://github.com/stevesimmons/uuid7 and https://github.com/stevesimmons/uuid7-csharp)
What are some alternatives?
uuid - Generate and parse UUIDs.
uuid7-csharp - UUIDv7 for C#. Time-ordered UUIDs with up to 50ns resolution and 48 bits of randomness.
uuid6-python - New time-based UUID formats which are suited for use as a database key
ksuid - K-Sortable Globally Unique IDs
prototypes - Draft Prototypes and Tests for UUIDv6 and beyond
Hashids.java - Hashids algorithm v1.0.0 implementation in Java
ulid - Universally Unique Lexicographically Sortable Identifier (ULID) in Python 3
uuid6-ietf-draft - Next Generation UUID Formats
presents - Like hashids, but based on block ciphers
vanity-uuid - Create "readable" UUIDs such as "5eedbed5-f05e-b055-ada0-d15ab11171e5" for all your UUID needs!
tiny_id - Rust library for generating non-sequential, tightly-packed short IDs.