I'm sorry, you should use hybrid_property:
from sqlalchemy.ext.hybrid import hybrid_property
class Plan(Base):
@hybrid_property
def calculated_date(self):
return date(self.year, self.month, self.day)
Also, in your query, don't use between:
session.query(Plan).\
filter(Plan.calculated_date >= from_date).\
filter(Plan.calculated_date <= to_date))
Cheers,
Ofir
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Enrico Morelli
Sent: Friday, October 04, 2013 4:05 PM
To: [email protected]
Subject: Re: [sqlalchemy] Query for date between a range
On Fri, 4 Oct 2013 15:55:07 +0300
"Ofir Herzas" <[email protected]> wrote:
> You can create a custom field in your model and check against it:
>
> class Plan(Base):
> .
> .
> .
> @property
> def calculated_date(self):
> return date(self.year, self.month, self.day)
>
>
> Then, in your query, use that field:
> session.query(Plan).filter(Plan.calculated_date.between(from_date,
> to_date))
>
> Haven't checked it myself, but I guess it should work ...
Thanks, but now I receive the error:
AttributeError: 'property' object has no attribute 'between'
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Enrico Morelli
> Sent: Friday, October 04, 2013 12:07 PM
> To: [email protected]
> Subject: [sqlalchemy] Query for date between a range
>
> Dear all,
>
> I've a table where the date is separated in single fields, one for
> year, one for day and one for month. So I need to query for a date
> range. I search in Internet and I found the following query that seems
> to be works: SELECT * FROM plan WHERE year * 10000 + month * 100 + day
> BETWEEN +'20130101' AND '20130131';
>
> Now I'm trying to translate to sqlalchemy, but I receive the following
> error:
>
> DataError: (DataError) invalid input syntax for integer:
> "2013-01-01T00:00:00" LINE 3: ...year * 1000 + plan.month * 100 +
> plan.day BETWEEN '2013-01-0... ^ 'SELECT plan.data AS plan_data,
> plan.month AS plan_month, plan.instrument_id AS plan_instrument_id,
> count(plan.instrument_id) AS count_1 \nFROM plan \nWHERE plan.year *
> %(year_1)s + plan.month * %(month_1)s + plan.day BETWEEN %(param_1)s
> AND %(param_2)s AND plan.data ILIKE %(data_1)s GROUP BY plan.data,
> plan.month, plan.instrument_id ORDER BY month, instrument_id'
> {'data_1': u'%#L%', 'param_1': datetime.datetime(2013, 1, 1, 0, 0),
> 'month_1': 100, 'year_1': 1000, 'param_2':
> datetime.datetime(2013, 10, 3, 0, 0)}
>
>
> The latest attempt to write the correct code is the following (the
> range come from a web form using a javascript plugin):
>
> from_date = request.POST.get('from_date', '') to_date =
> request.POST.get('to_date', '') from_date =
> datetime.strptime(from_date, '%Y-%m-%d') to_date =
> datetime.strptime(to_date, '%Y-%m-%d') if from_date.day < 10:
> day = "0%s" % from_date.day
> else:
> day = "%s" % from_date.day
> if from_date.month < 10:
> month = "0%s" % from_date.month
> else:
> month = "%s" % from_date.month
> if to_date.day < 10:
> tday = "0%s" % to_date.day
> else:
> tday = "%s" % to_date.day
> if to_date.month < 10:
> tmonth = "0%s" % to_date.month
> else:
> tmonth = "%s" % to_date.month
> fd = '%s%s%s' % (from_date.year, month, day) td = '%s%s%s' %
> (to_date.year, tmonth, tday) print fd, td results =
> Session.query(Plan.data,
> Plan.month,Plan.instrument_id,func.count(Plan.instrument_id)).filter(
> and_((Plan.year*1000+Plan.month*100+Plan.day).between(from_date,
> to_date), Plan.data.ilike('%%%s%%' % item),)).group_by(
> Plan.data, Plan.month,
> Plan.instrument_id ).order_by('month', 'instrument_id').all()
>
> Where I'm wrong?
>
> Thanks to all
> --
> -------------------------------------------------------------
> Enrico Morelli
> System Administrator | Programmer | Web Developer
>
> CERM - Polo Scientifico
> Via Sacconi, 6 - 50019 Sesto Fiorentino (FI) - ITALY
> phone: +39 055 457 4269
> fax: +39 055 457 4253
> -------------------------------------------------------------
>
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>
--
-------------------------------------------------------------
Enrico Morelli
System Administrator | Programmer | Web Developer
CERM - Polo Scientifico
Via Sacconi, 6 - 50019 Sesto Fiorentino (FI) - ITALY
phone: +39 055 457 4269
fax: +39 055 457 4253
-------------------------------------------------------------
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