{"title":"PostgreSQL 特有数据库函数","version":"6.1","locale":"zh-hans","docname":"ref/contrib/postgres/functions","url":"/zh-hans/6.1/ref/contrib/postgres/functions/","canonical":"https://djangodocs.dev/zh-hans/6.1/ref/contrib/postgres/functions/","summary":"所有这些函数都可以从 django.contrib.postgres.function 模块中获得。返回一个版本 4 的 UUID。","html":"

PostgreSQL 特有数据库函数Link to this heading#

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所有这些函数都可以从 django.contrib.postgres.function 模块中获得。

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RandomUUIDLink to this heading#

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\nclass RandomUUIDLink to this definition#
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返回一个版本 4 的 UUID。

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用法示例：

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Python console
>>> from django.contrib.postgres.functions import RandomUUID\n>>> Article.objects.update(uuid=RandomUUID())\n
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TransactionNowLink to this heading#

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\nclass TransactionNowLink to this definition#
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返回数据库服务器上当前事务开始的日期和时间。如果你不在事务中，它将返回当前语句的日期和时间。这是对 django.db.models.function.Now 的补充，后者返回当前语句的日期和时间。

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Note that only the outermost call to atomic()\nsets up a transaction and thus sets the time that TransactionNow() will\nreturn; nested calls create savepoints which do not affect the transaction\ntime.

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用法示例：

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Python console
>>> from django.contrib.postgres.functions import TransactionNow\n>>> Article.objects.filter(published__lte=TransactionNow())\n<QuerySet [<Article: How to Django>]>\n
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