如何在常规SQL中编写此Django查询？

Question

results = Content.objects.filter(next_decay_at__lte=datetime.datetime.now())

Answer 1

The query that did the ORM of Django is equivalent (Django got the datetime directly from Python) to:

SELECT field1, field2, fieldn FROM app_content WHERE next_decay_at <= NOW()

NOW() is a SQL function that provide the actual datetime. You can get more info at:

http://www.w3schools.com/sql/sql_func_now.asp

Answer 2

You can find out exactly what Django sends with results._as_sql() . In your particular case it's going to write a query with the specific date you passed in. If you were really writing the query directly in SQL you'd probably want to use a symbolic NOW() instead.

Answer 3

You should consider leveraging https://github.com/robhudson/django-debug-toolbar and check out the SQL tab. You'll get a chance to see all queries ran within your app.