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Module uuid
Overview
A "UUID" is a `Universally unique identifier <https://en.wikipedia.org/wiki/Universally_unique_identifier>`_. If an application requires that a value be unique only within a single computer or on a single database, then a simple counter is better than a UUID, because getting a UUID is time-consuming (it requires a `syscall <https://en.wikipedia.org/wiki/Syscall>`_). For clusters of computers, or widely distributed applications, UUIDs are better. Tarantool generates UUIDs following the rules for RFC 4122 `version 4 variant 1 <https://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_(random)>`_.
API Reference
Below is list of all ``uuid`` functions and members.
Name
Use
:ref:`uuid.NULL <uuid-null>`
A nil UUID object
:ref:`uuid() <uuid-__call>` |br| :ref:`uuid.bin() <uuid-bin>` |br| :ref:`uuid.str() <uuid-str>`
Get a UUID
:ref:`uuid.new() <uuid-new>`
Create a UUID
:ref:`uuid.fromstr() <uuid-fromstr>` |br| :ref:`uuid.frombin() <uuid-frombin>` |br| :ref:`uuid_object:bin() <uuid-object_bin>` |br| :ref:`uuid_object:str() <uuid-object_str>`
Get a converted UUID
:ref:`uuid.is_uuid() <uuid-is_uuid>`
Check if the specified value has UUID type
:ref:`uuid_object:isnil() <uuid-isnil>`
Check if a UUID is an all-zero value
A nil UUID object. Contains the all-zero UUID value -- ``00000000-0000-0000-0000-000000000000``.
Since version :doc:`2.4.1 </release/2.4.1>`. Create a UUID sequence. You can use it in an index over a :ref:`UUID field <index-box_indexed-field-types>`. For example, to create such index for a space named ``test``, say:
tarantool> box.space.test:create_index("pk", {parts={{field = 1, type = 'uuid'}}})
Now you can insert UUIDs into the space:
tarantool> box.space.test:insert{uuid.new()}
---
- [e631fdcc-0e8a-4d2f-83fd-b0ce6762b13f]
...

tarantool> box.space.test:insert{uuid.fromstr('64d22e4d-ac92-4a23-899a-e59f34af5479')}
---
- [64d22e4d-ac92-4a23-899a-e59f34af5479]
...

tarantool> box.space.test:select{}
---
- - [64d22e4d-ac92-4a23-899a-e59f34af5479]
- [e631fdcc-0e8a-4d2f-83fd-b0ce6762b13f]
...
return
a UUID
rtype

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:ref:`uuid.new() <uuid-new>`
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