On Thu, Nov 30, 2017 at 10:31 AM, Kevin Foley <kfole...@gmail.com> wrote:
> I created a Boolean attribute for an Oracle table that checks if an address
> is the customer's current address.
>
> @is_current_address.expression
> def is_current_address(cls):
> return and_(cls.eff_date <= func.current_date(), cls.term_date >=
> func.current_date())
>
> When I try to run a query with this it generates the following where clause:
>
> WHERE (addresses.eff_date <= CURRENT_DATE AND addresses.term_date >=
> CURRENT_DATE) = 1
can you show me the "try to run a query" part, because that expression
alone would not be doing the "= 1" thing you are describing. it
would do that if it were being interpreted in some boolean context
like "expr == True" or something like that.
Here's an MCVE:
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.hybrid import hybrid_property
import datetime
from sqlalchemy.dialects import oracle
Base = declarative_base()
class A(Base):
__tablename__ = 'a'
id = Column(Integer, primary_key=True)
eff_date = Column(DateTime)
term_date = Column(DateTime)
@hybrid_property
def is_current_address(self):
return self.eff_date <= datetime.datetime.now() and \
self.term_date >= datetime.datetime.now()
@is_current_address.expression
def is_current_address(cls):
return and_(
cls.eff_date <= func.current_date(),
cls.term_date >= func.current_date())
s = Session()
q = s.query(A.is_current_address).filter(A.is_current_address)
print q.statement.compile(dialect=oracle.dialect())
output:
SELECT a.eff_date <= CURRENT_DATE AND a.term_date >= CURRENT_DATE AS
is_current_address
FROM a
WHERE a.eff_date <= CURRENT_DATE AND a.term_date >= CURRENT_DATE
tried it back to 1.0.x doesn't render an =1
>
> and generates the Oracle error:
>
>> ORA-00933: SQL command not properly ended
>
>
> I believe this type of expression isn't supported in Oracle, however
> manually removing the "= 1" from the clause makes the query work. Is there
> a different approach I need to take to make sure this is handled properly?
>
> --
> 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
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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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