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Refs #25774 -- Adjusted datetime database function docs field names.
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Simon Charette
parent
c4a876a0c1
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90468079ec
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@ -286,9 +286,9 @@ Date Functions
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We'll be using the following model in examples of each function::
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class Experiment(models.Model):
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start_time = models.DateTimeField()
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start_datetime = models.DateTimeField()
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start_date = models.DateField(null=True, blank=True)
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end_time = models.DateTimeField(null=True, blank=True)
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end_datetime = models.DateTimeField(null=True, blank=True)
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end_date = models.DateField(null=True, blank=True)
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``Extract``
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@ -349,16 +349,16 @@ Usage example::
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>>> start = datetime(2015, 6, 15)
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>>> end = datetime(2015, 7, 2)
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>>> Experiment.objects.create(
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... start_time=start, start_date=start.date(),
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... end_time=end, end_date=end.date())
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... start_datetime=start, start_date=start.date(),
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... end_datetime=end, end_date=end.date())
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>>> # Add the experiment start year as a field in the QuerySet.
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>>> experiment = Experiment.objects.annotate(
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... start_year=Extract('start_time', 'year')).get()
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... start_year=Extract('start_datetime', 'year')).get()
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>>> experiment.start_year
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2015
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>>> # How many experiments completed in the same year in which they started?
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>>> Experiment.objects.filter(
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... start_time__year=Extract('end_time', 'year')).count()
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... start_datetime__year=Extract('end_datetime', 'year')).count()
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1
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``DateField`` extracts
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@ -395,8 +395,8 @@ that deal with date-parts can be used with ``DateField``::
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>>> start_2015 = datetime(2015, 6, 15, 23, 30, 1, tzinfo=timezone.utc)
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>>> end_2015 = datetime(2015, 6, 16, 13, 11, 27, tzinfo=timezone.utc)
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>>> Experiment.objects.create(
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... start_time=start_2015, start_date=start_2015.date(),
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... end_time=end_2015, end_date=end_2015.date())
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... start_datetime=start_2015, start_date=start_2015.date(),
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... end_datetime=end_2015, end_date=end_2015.date())
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>>> Experiment.objects.annotate(
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... year=ExtractYear('start_date'),
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... month=ExtractMonth('start_date'),
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@ -440,19 +440,19 @@ Each class is also a ``Transform`` registered on ``DateTimeField`` as
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>>> start_2015 = datetime(2015, 6, 15, 23, 30, 1, tzinfo=timezone.utc)
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>>> end_2015 = datetime(2015, 6, 16, 13, 11, 27, tzinfo=timezone.utc)
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>>> Experiment.objects.create(
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... start_time=start_2015, start_date=start_2015.date(),
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... end_time=end_2015, end_date=end_2015.date())
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... start_datetime=start_2015, start_date=start_2015.date(),
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... end_datetime=end_2015, end_date=end_2015.date())
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>>> Experiment.objects.annotate(
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... year=ExtractYear('start_time'),
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... month=ExtractMonth('start_time'),
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... day=ExtractDay('start_time'),
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... weekday=ExtractWeekDay('start_time'),
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... hour=ExtractHour('start_time'),
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... minute=ExtractMinute('start_time'),
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... second=ExtractSecond('start_time'),
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... year=ExtractYear('start_datetime'),
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... month=ExtractMonth('start_datetime'),
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... day=ExtractDay('start_datetime'),
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... weekday=ExtractWeekDay('start_datetime'),
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... hour=ExtractHour('start_datetime'),
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... minute=ExtractMinute('start_datetime'),
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... second=ExtractSecond('start_datetime'),
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... ).values(
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... 'year', 'month', 'day', 'weekday', 'hour', 'minute', 'second',
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... ).get(end_time__year=ExtractYear('start_time'))
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... ).get(end_datetime__year=ExtractYear('start_datetime'))
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{'year': 2015, 'month': 6, 'day': 15, 'weekday': 2, 'hour': 23, 'minute': 30, 'second': 1}
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When :setting:`USE_TZ` is ``True`` then datetimes are stored in the database
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@ -465,11 +465,11 @@ values that are returned::
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>>> tzinfo = pytz.timezone('Australia/Melbourne') # UTC+10:00
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>>> with timezone.override(tzinfo):
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... Experiment.objects.annotate(
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... day=ExtractDay('start_time'),
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... weekday=ExtractWeekDay('start_time'),
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... hour=ExtractHour('start_time'),
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... day=ExtractDay('start_datetime'),
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... weekday=ExtractWeekDay('start_datetime'),
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... hour=ExtractHour('start_datetime'),
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... ).values('day', 'weekday', 'hour').get(
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... end_time__year=ExtractYear('start_time'),
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... end_datetime__year=ExtractYear('start_datetime'),
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... )
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{'day': 16, 'weekday': 3, 'hour': 9}
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@ -479,11 +479,11 @@ way, and takes priority over an active timezone::
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>>> import pytz
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>>> tzinfo = pytz.timezone('Australia/Melbourne')
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>>> Experiment.objects.annotate(
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... day=ExtractDay('start_time', tzinfo=melb),
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... weekday=ExtractWeekDay('start_time', tzinfo=melb),
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... hour=ExtractHour('start_time', tzinfo=melb),
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... day=ExtractDay('start_datetime', tzinfo=melb),
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... weekday=ExtractWeekDay('start_datetime', tzinfo=melb),
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... hour=ExtractHour('start_datetime', tzinfo=melb),
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... ).values('day', 'weekday', 'hour').get(
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... end_time__year=ExtractYear('start_time'),
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... end_datetime__year=ExtractYear('start_datetime'),
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... )
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{'day': 16, 'weekday': 3, 'hour': 9}
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@ -546,11 +546,11 @@ Usage example::
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>>> from datetime import datetime
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>>> from django.db.models import Count, DateTimeField
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>>> from django.db.models.functions import Trunc
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>>> Experiment.objects.create(start_time=datetime(2015, 6, 15, 14, 30, 50, 321))
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>>> Experiment.objects.create(start_time=datetime(2015, 6, 15, 14, 40, 2, 123))
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>>> Experiment.objects.create(start_time=datetime(2015, 12, 25, 10, 5, 27, 999))
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>>> Experiment.objects.create(start_datetime=datetime(2015, 6, 15, 14, 30, 50, 321))
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>>> Experiment.objects.create(start_datetime=datetime(2015, 6, 15, 14, 40, 2, 123))
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>>> Experiment.objects.create(start_datetime=datetime(2015, 12, 25, 10, 5, 27, 999))
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>>> experiments_per_day = Experiment.objects.annotate(
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... start_day=Trunc('start_time', 'day', output_field=DateTimeField())
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... start_day=Trunc('start_datetime', 'day', output_field=DateTimeField())
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... ).values('start_day').annotate(experiments=Count('id'))
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>>> for exp in experiments_per_day:
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... print(exp['start_day'], exp['experiments'])
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@ -558,10 +558,10 @@ Usage example::
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2015-06-15 00:00:00 2
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2015-12-25 00:00:00 1
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>>> experiments = Experiment.objects.annotate(
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... start_day=Trunc('start_time', 'day', output_field=DateTimeField())
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... start_day=Trunc('start_datetime', 'day', output_field=DateTimeField())
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... ).filter(start_day=datetime(2015, 6, 15))
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>>> for exp in experiments:
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... print(exp.start_time)
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... print(exp.start_datetime)
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...
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2015-06-15 14:30:50.000321
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2015-06-15 14:40:02.000123
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@ -592,9 +592,9 @@ that deal with date-parts can be used with ``DateField``::
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>>> start1 = datetime(2014, 6, 15, 14, 30, 50, 321, tzinfo=timezone.utc)
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>>> start2 = datetime(2015, 6, 15, 14, 40, 2, 123, tzinfo=timezone.utc)
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>>> start3 = datetime(2015, 12, 31, 17, 5, 27, 999, tzinfo=timezone.utc)
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>>> Experiment.objects.create(start_time=start1, start_date=start1.date())
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>>> Experiment.objects.create(start_time=start2, start_date=start2.date())
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>>> Experiment.objects.create(start_time=start3, start_date=start3.date())
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>>> Experiment.objects.create(start_datetime=start1, start_date=start1.date())
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>>> Experiment.objects.create(start_datetime=start2, start_date=start2.date())
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>>> Experiment.objects.create(start_datetime=start3, start_date=start3.date())
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>>> experiments_per_year = Experiment.objects.annotate(
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... year=TruncYear('start_date')).values('year').annotate(
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... experiments=Count('id'))
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@ -607,7 +607,7 @@ that deal with date-parts can be used with ``DateField``::
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>>> import pytz
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>>> melb = pytz.timezone('Australia/Melbourne')
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>>> experiments_per_month = Experiment.objects.annotate(
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... month=TruncMonth('start_time', tzinfo=melb)).values('month').annotate(
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... month=TruncMonth('start_datetime', tzinfo=melb)).values('month').annotate(
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... experiments=Count('id'))
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>>> for exp in experiments_per_month:
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... print(exp['month'], exp['experiments'])
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@ -659,14 +659,14 @@ Usage example::
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>>> from django.utils import timezone
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>>> import pytz
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>>> start1 = datetime(2014, 6, 15, 14, 30, 50, 321, tzinfo=timezone.utc)
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>>> Experiment.objects.create(start_time=start1, start_date=start1.date())
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>>> Experiment.objects.create(start_datetime=start1, start_date=start1.date())
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>>> melb = pytz.timezone('Australia/Melbourne')
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>>> Experiment.objects.annotate(
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... date=TruncDate('start_time'),
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... day=TruncDay('start_time', tzinfo=melb),
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... hour=TruncHour('start_time', tzinfo=melb),
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... minute=TruncMinute('start_time'),
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... second=TruncSecond('start_time'),
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... date=TruncDate('start_datetime'),
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... day=TruncDay('start_datetime', tzinfo=melb),
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... hour=TruncHour('start_datetime', tzinfo=melb),
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... minute=TruncMinute('start_datetime'),
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... second=TruncSecond('start_datetime'),
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... ).values('date', 'day', 'hour', 'minute', 'second').get()
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{'date': datetime.date(2014, 6, 15),
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'day': datetime.datetime(2014, 6, 16, 0, 0, tzinfo=<DstTzInfo 'Australia/Melbourne' AEST+10:00:00 STD>),
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