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class=\"sect1\" id=\"DATATYPE-UUID\">\n<div class=\"titlepage\">\n<div>\n<div>\n<h2 class=\"title\" lang=\"zh\">\n<div>\n<div>\n<h2 class=\"title\" style=\"clear: both\">8.12. <acronym class=\"acronym\">UUID</acronym>类型 </h2>\n</div>\n</div>\n</h2>\n</div>\n</div>\n</div>\n<p lang=\"zh\"><code class=\"type\">uuid</code> 数据类型用于存储由 <a class=\"ulink\" href=\"https://datatracker.ietf.org/doc/html/rfc9562\" target=\"_top\">RFC 9562</a>、ISO/IEC 9834-8:2005 及相关标准定义的通用唯一标识符（UUID）。（有些系统把这种数据类型称为全局唯一标识符，或 GUID<a class=\"indexterm\" id=\"id-1.5.7.20.3.3\" name=\"id-1.5.7.20.3.3\"></a>。）这种标识符是一个 128 位的量，由某种算法生成，该算法的设计目标是：使已知宇宙中其他人用同一算法生成出相同标识符的概率极低。因此，对于分布式系统而言，这类标识符能比序列生成器提供更好的唯一性保证，因为序列生成器仅在单个数据库内唯一。</p>\n<p lang=\"zh\">RFC 9562 定义了 8 种不同的 UUID 版本。每个版本对生成新 UUID 值都有各自的要求，也各自具备不同的优缺点。<span class=\"productname\">PostgreSQL</span> 原生支持使用 UUIDv4 和 UUIDv7 算法生成 UUID。或者，也可以在数据库外部使用任意算法生成 UUID 值。<code class=\"type\">uuid</code> 数据类型可用于存储任何 UUID，无论其来源和版本为何。</p>\n<p lang=\"zh\">UUID 写作一串小写十六进制数字，并用连字符分隔成若干组：先是 8 位一组，接着是三个 4 位组，最后是一个 12 位组。总共 32 个十六进制数字表示 128 个二进制位。标准形式的 UUID 例如：</p>\n<pre class=\"programlisting\">a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11\n</pre>\n<p lang=\"zh\">PostgreSQL 还接受以下替代输入形式：使用大写十六进制数字、用花括号包围标准格式、省略部分或全部连字符，以及在任意四位数字组后添加连字符。例如：</p>\n<pre class=\"programlisting\">A0EEBC99-9C0B-4EF8-BB6D-6BB9BD380A11\n{a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11}\na0eebc999c0b4ef8bb6d6bb9bd380a11\na0ee-bc99-9c0b-4ef8-bb6d-6bb9-bd38-0a11\n{a0eebc99-9c0b4ef8-bb6d6bb9-bd380a11}\n</pre>\n<p lang=\"zh\">输出总是采用标准形式。</p>\n<p lang=\"zh\">关于如何在 <span class=\"productname\">PostgreSQL</span> 中生成 UUID，请参见<a class=\"xref\" href=\"/docs/18/functions-uuid.html\" title=\"9.14. UUID 函数\">第 9.14 节</a>。</p>\n</div>", "manual_path": "datatype-uuid.html", "localization": {"status": "complete", "sources": [{"url": "/docs/18/datatype-uuid.html", "method": "same-major semantic node", "sha256": "7069d17b49583a9c54eae2187aa29e86d36e6a65f04b52d259ce4bc6cda64f1f", "language": "zh", 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