{"title":"PostgreSQL specific database functions","version":"2.1","locale":"pt-br","docname":"ref/contrib/postgres/functions","url":"/pt-br/2.1/ref/contrib/postgres/functions/","canonical":"https://djangodocs.dev/pt-br/2.1/ref/contrib/postgres/functions/","summary":"All of these functions are available from the django.contrib.postgres.functions module. RandomUUID Link para este cabeçalho # class RandomUUID Link para esta…","html":"

PostgreSQL specific database functionsLink para este cabeçalho#

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All of these functions are available from the\ndjango.contrib.postgres.functions module.

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RandomUUIDLink para este cabeçalho#

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\nclass RandomUUIDLink para esta definição#
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Returns a version 4 UUID.

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The pgcrypto extension must be installed. You can use the\nCryptoExtension migration\noperation to install it.

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Usage example:

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Code
>>> from django.contrib.postgres.functions import RandomUUID\n>>> Article.objects.update(uuid=RandomUUID())\n
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TransactionNowLink para este cabeçalho#

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\nclass TransactionNowLink para esta definição#
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Returns the date and time on the database server that the current transaction\nstarted. If you are not in a transaction it will return the date and time of\nthe current statement. This is a complement to\ndjango.db.models.functions.Now, which returns the date and time of the\ncurrent statement.

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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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Usage example:

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Code
>>> 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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