大约有 40,000 项符合查询结果（耗时：0.0539秒） [XML]
Difference between socket and websocket?
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How do I find out which computer is the domain controller in Windows programmatically?
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Re-entrant locks in C#
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Hide all warnings in ipython
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SQL DELETE with INNER JOIN
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Are there any downsides to enabling git rerere?
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Matplotlib different size subplots
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Create Django model or update if exists
...ase refer to @Zags excellent answer
Django already has a get_or_create, https://docs.djangoproject.com/en/dev/ref/models/querysets/#get-or-create
For you it could be :
id = 'some identifier'
person, created = Person.objects.get_or_create(identifier=id)
if created:
# means you have created a...
Java: Difference between the setPreferredSize() and setSize() methods in components
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What is the meaning of addToBackStack with null parameter?
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