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<h1><a id="user-content-uuid-or-else" class="anchor" aria-hidden="true" href="#uuid-or-else"><span aria-hidden="true" class="octicon octicon-link"></span></a>UUID or else</h1>
<p>There are many use cases where we need to use a unique ID.
In my experience, I only encouter 2 cases:</p>
<ul>
<li>ID to trace request from client to server, from service to service (microservice architecture or nanoservice I don't know).</li>
<li>Primary key for database.</li>
</ul>
<p>In my Go universe, there are some libs to help us with this:</p>
<ul>
<li><a href="https://github.com/google/uuid">google/uuid</a></li>
<li><a href="https://github.com/rs/xid">rs/xid</a></li>
<li><a href="https://github.com/segmentio/ksuid">segmentio/ksuid</a></li>
<li><a href="https://github.com/oklog/ulid">oklog/ulid</a></li>
</ul>
<h2><a id="user-content-first-use-case-is-trace-id-or-context-aware-id" class="anchor" aria-hidden="true" href="#first-use-case-is-trace-id-or-context-aware-id"><span aria-hidden="true" class="octicon octicon-link"></span></a>First use case is trace ID, or context aware ID</h2>
<p>The ID is used only for trace and log.
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If same ID is generated twice (because maybe the possibilty is too small but not 0), honestly I don't care.
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When I use that ID to search log , if it pops more than things I care for, it is still no harm to me.</p>
<p>My choice for this use case is <strong>rs/xid</strong>.
Because it is small (not span too much on log line) and copy friendly.</p>
<h2><a id="user-content-second-use-case-is-primary-key-also-hard-choice" class="anchor" aria-hidden="true" href="#second-use-case-is-primary-key-also-hard-choice"><span aria-hidden="true" class="octicon octicon-link"></span></a>Second use case is primary key, also hard choice</h2>
<p>Why I don't use auto increment key for primary key?
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The answer is simple, I don't want to write database specific SQL.
SQLite has some different syntax from MySQL, and PostgreSQL and so on.
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Every logic I can move to application layer from database layer, I will.</p>
<p>In the past and present, I use <strong>google/uuid</strong>, specificially I use UUID v4.
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In the future I will look to use <strong>segmentio/ksuid</strong> and <strong>oklog/ulid</strong> (trial and error of course).
Both are sortable, but <strong>google/uuid</strong> is not.
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The reason I'm afraid because the database is sensitive subject, and I need more testing and battle test proof to trust those libs.</p>
<h2><a id="user-content-what-else" class="anchor" aria-hidden="true" href="#what-else"><span aria-hidden="true" class="octicon octicon-link"></span></a>What else?</h2>
<p>I think about adding prefix to ID to identify which resource that ID represents.</p>
<h2><a id="user-content-thanks" class="anchor" aria-hidden="true" href="#thanks"><span aria-hidden="true" class="octicon octicon-link"></span></a>Thanks</h2>
<ul>
<li><a href="https://www.cybertec-postgresql.com/en/uuid-serial-or-identity-columns-for-postgresql-auto-generated-primary-keys/" rel="nofollow">UUID, SERIAL OR IDENTITY COLUMNS FOR POSTGRESQL AUTO-GENERATED PRIMARY KEYS?</a></li>
<li><a href="https://brandur.org/nanoglyphs/026-ids" rel="nofollow">Identity Crisis: Sequence v. UUID as Primary Key</a></li>
<li><a href="https://blog.kowalczyk.info/article/JyRZ/generating-good-unique-ids-in-go.html" rel="nofollow">Generating good unique ids in Go</a></li>
<li><a href="https://encore.dev/blog/go-1.18-generic-identifiers" rel="nofollow">How we used Go 1.18 when designing our Identifiers</a></li>
<li><a href="https://blog.daveallie.com/ulid-primary-keys" rel="nofollow">ULIDs and Primary Keys</a></li>
<li><a href="https://0pointer.net/blog/projects/ids.html" rel="nofollow">On IDs</a></li>
</ul>
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<div>
Feel free to ask me via
<a href="mailto:hauvipapro+posts@gmail.com">email</a> or
<a rel="me" href="https://hachyderm.io/@haunguyen">Mastodon</a>
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