Greetings, I'm using SQLAlchemy 0.6 with Python 2.6
medical-app/
facility/
recalls.py
common/
__init__.py
patient.py
common.py
settings.py
So the application I'm working on has directory structure as above.
Program starts when
I run recalls.py (which is under /medical-app/facility). Also,
recalls.py imports common.py
(which is under medical-app/common/common.py). Common.py further
imports settings.py which
has code like following
USERNAME = 'root'
PASSWORD = ''
SERVER = 'localhost'
DB_NAME = localdb'
DB = create_engine('mysql://'+USERNAME+':'+PASSWORD+'@'+SERVER
+'/'+DB_NAME, pool_size = 20, pool_recycle=100)
db_session = session.sessionmaker(bind=DB, expire_on_commit=False)
alchemy_session = db_session()
META = MetaData(DB)
In patient.py, I've declarative style classes as below
from common.settings import alchemy_session, DB, META
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Table
Base = declarative_base()
class Patient(Base):
__table__ = Table('Patient', Base.metadata,
autoload=True, autoload_with=DB)
Then finally in recalls I do the following
from common import alchemy_session
from common.patient import Patient
patient = alchemy_session.query(Patient).filter(Patient.patientId ==
1).first()#this works
patient = alchemy_session.query(Patient).filter(Patient.patientId ==
2).first()#this fails
#with following error
patient = alchemy_session.query(Patient).filter(
File c:\python26\lib\site-packages\sqlalchemy-0.7.1-py2.6.egg
\sqlalchemy\orm\
session.py, line 897, in query
return self._query_cls(entities, self, **kwargs)
File c:\python26\lib\site-packages\sqlalchemy-0.7.1-py2.6.egg
\sqlalchemy\orm\
query.py, line 105, in __init__
self._set_entities(entities)
File c:\python26\lib\site-packages\sqlalchemy-0.7.1-py2.6.egg
\sqlalchemy\orm\
query.py, line 112, in _set_entities
entity_wrapper(self, ent)
File c:\python26\lib\site-packages\sqlalchemy-0.7.1-py2.6.egg
\sqlalchemy\orm\
query.py, line 2800, in __init__
expected - got '%r' % column
sqlalchemy.exc.InvalidRequestError: SQL expression, column, or mapped
entity exp
ected - got 'class 'vi_pycommon.patient.Patient''
D:\integration-scripts
\allendale_bone_jointalchemy_session.query(Patient).filte
r(Patient.patientId == 2).first()
---
so if you notice this line didn't fail
patient = alchemy_session.query(Patient).filter(Patient.patientId ==
1).first()
but next line did, which was
patient = alchemy_session.query(Patient).filter(Patient.patientId ==
2).first()#this fails
So I'm actually really stumped as to why this second call is failing
with that error. I am absolutely
sure I'm doing something wrong here, so kindly let me know how can I
fix this one.
Thanks in advance for all help.
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