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34 lines
1.1 KiB
Markdown
34 lines
1.1 KiB
Markdown
# Generating UUIDs With pgcrypto
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If you check out the docs for the [`uuid-ossp`
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extension](https://www.postgresql.org/docs/current/static/uuid-ossp.html),
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you'll come across the following message.
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> The OSSP UUID library... is not well maintained, and is becoming
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> increasingly difficult to port to newer platforms.
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A little bit later, it says:
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> If you only need randomly-generated (version 4) UUIDs, consider using the
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> gen_random_uuid() function from the pgcrypto module instead.
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So, if we are using the UUID data type and only need to generate random
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UUIDs, we can rely on the [`pgcrypto`
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extension](https://www.postgresql.org/docs/current/static/pgcrypto.html). It
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comes with the `gen_random_uuid()` function which generates random v4 UUIDs.
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```sql
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> create extension "pgcrypto";
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CREATE EXTENSION
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> select gen_random_uuid();
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gen_random_uuid
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--------------------------------------
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0a557c31-0632-4d3e-a349-e0adefb66a69
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> select gen_random_uuid();
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gen_random_uuid
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--------------------------------------
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83cdd678-8198-4d56-935d-d052f2e9db37
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```
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