On 11/10/2016 08:10 PM, horcle_buzz wrote:
I am using SQLAlchemy and am having an issue wrt to an SQLite error:
|
SQLiteDatetype only accepts Pythondate objects asinput.
[SQL:'SELECT anon_1.patient_sid AS sid FROM
(SELECT clinical_data.patient_sid AS patient_sid FROM clinical_data
WHERE clinical_data.event_date >= ?) AS anon_1']
|
I understand perfectly the meaning of the error, but I do not understand
why it is happening in my case.
nor do I. You'd need to provide a complete test. Here is one, modify it
to show how you get your error.
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
from datetime import datetime
Base = declarative_base()
class ClinicalData(Base):
__tablename__ = 'clinical_data'
id = Column(Integer, primary_key=True, autoincrement=True)
patient_id = Column(Integer)
event_date = Column(Date)
e = create_engine("sqlite://", echo=True)
Base.metadata.create_all(e)
valdate = datetime.strptime('1776-01-01 00:00:00', "%Y-%m-%d
%H:%M:%S").date()
s = Session(e)
s.add(ClinicalData(event_date=valdate))
s.commit()
print s.query(ClinicalData).filter(ClinicalData.event_date >= valdate).all()
The parameter that I am passing to do the date comparison in the query
above
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clinical_data.event_date >=?
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is set as:
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valdate =datetime.strptime('1776-01-01 00:00:00',"%Y-%m-%d %H:%M:%S").date()
|
and, I have validated that the data type of `valdate` is `<type
'datetime.date'>`
The class used to construct the query is:
|
classClinicalData(db.Model):
__tablename__ ='clinical_data'
id =Column(Integer,primary_key=True,autoincrement=True)
patient_id =Column(Integer)
patient_sid =Column(Integer)
string_value =Column(String(255))
double_value =Column(Float)
data_type_id =Column(Integer)
event_date =Column(Date)
ontology_id =Column(Integer)
attribute_id =Column(Integer)
project_id =Column(Integer)
replaced_by_id =Column(Integer)
date_record_added =Column(DateTime)
parent =Column(Integer)
num_children =Column(Integer)
lft =Column(Integer)
rgt =Column(Integer)
|
The SQLAlchemy documentation for SQLite states (see [SQLAlchemy SQLite
documentation][1] <
http://docs.sqlalchemy.org/en/latest/dialects/sqlite.html>) that
"SQLAlchemy’s own DateTime and related types provide date formatting and
parsing functionality when SQlite is used..."
Note that when I use `DateTime` as a data type in my class model on the
`event_date` attribute I get the following error
|
SQLiteDateTimetype only accepts Pythondatetime anddate objects asinput.
|
For this I define
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valdate =datetime.strptime('1776-01-01 00:00:00',"%Y-%m-%d %H:%M:%S")
|
without the `date()` method. As expected, `type(valdate)` in this case
yields
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<type'datetime.datetime'>
|
I have tried every combination of creating the variable `valdate` with
the `event_date` attribute of my class.
I am not asking how to convert my string object to a python datetime
object, nor am I asking what the error means. I am not sure exactly why
I keep getting this error when everything appears to be sufficiently
defined.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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