#24176: Incorrect SQL text when searching for datetime values with milliseconds
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Reporter: me21 | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.6
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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I have SQLite database where certain column in table is created as
TIMESTAMP. The database is created not by Django, but by SymmetricDS, a DB
replication software. The database is replicated from Microsoft SQL Server
2005, where it has datetime type. In my Django application, the model has
DateTimeField for that column.
{{{#!python
class Calendar(models.Model):
day_id = models.IntegerField(primary_key=True)
day_date = models.DateTimeField()
}}}
The table contains a row with day_date equal to '2015-01-18 00:00:00.000'.
If I try to search for that row with
{{{#!python
day = Calendar.objects.filter(day_date=date(2015,1,18))
}}}
I get SQL with the following WHERE clause:
{{{#!sql
WHERE day_date = '2015-01-18 00:00:00'
}}}
, i.e. it doesn't contain milliseconds part. As a consequence, the row is
not found. According to http://www.sqlite.org/datatype3.html, the text
representation of datetime values in SQLite should have milliseconds part.
In MS SQL it works fine (I use django-pyodbc-azure driver).
The workaround is:
{{{#!python
dt = datetime(2015,1,18) # datetime, not date
day = Calendar.objects.filter(day_date__lt=day+timedelta(seconds=1),
day_date__gt=day-timedelta(seconds=1))
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/24176>
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