Re: [sqlalchemy] Could not locate column in row for column
Hello, Mike
thank you for your answer
for now it works fine with the patch create_engine(
description_encoding = 'utf8')
2014-06-20 22:36 GMT+04:00 Mike Bayer :
>
> On 6/20/14, 12:14 PM, Mike Bayer wrote:
> > On 6/20/14, 7:32 AM, Mike Bayer wrote:
> >> NoSuchColumnError: "Could not locate column in row for column
> >>
> '\\u0417\\u0430\\u043a\\u0430\\u0437\\u044b.\\u041d\\u043e\\u043c\\u0435\\u0440
> >> \\u0437\\u0430\\u043a\\u0430\\u0437\\u0430'"
> >>
> >> The problem is i can't really debug this error because it isn't clear
> >> what should be in pk_cols
> >>
> >> Previously in orm/loading.py there is a string
> >> pk_cols = mapper.primary_key # line number 250
> >>
> >> So, pk_cols is a list of Column() objects.
> >> row is a list of values from query
> >> Surely, [row[column] for column in pk_cols] raises error, because
> >> column is a Column() object and can't be index for row. But i can't
> >> imagine how this code may work. Is this a bug?
> >> the ResultProxy contains translation logic that receives Column objects
> >> and locates the data by name. This is documented at
> >> http://docs.sqlalchemy.org/en/rel_0_9/core/tutorial.html#selecting and
> >> is the primary method by which the ORM relates mapped columns to result
> >> sets.
> >>
> >> In this case the issue is most likely yet another pyodbc + unicode
> >> encoding issue, of which there are many, and often there's no way to
> >> work around. Need to know 1. OS platform 2. FreeTDS version 3. UnixODBC
> >> or iODBC (and what version) 4. pyodbc version 5. SQL Server version. I
> >> can try to test but often these unicode issues aren't easy to resolve
> >> (have you tried pymssql? ).thanks.
> > good news, I can reproduce this, and on my end at least it needs the
> > so-called "description_encoding" workaround. We may have to revisit
> > the defaults on this parameter for modern versions of Pyodbc. The test
> > below produces your error without the param, resolves with it. Please
> > try this out on your create_engine(), thanks.
> >
> > #! coding: utf-8
> >
> > from sqlalchemy import *
> >
> > engine = create_engine("mssql+pyodbc://scott:tiger@ms_2008", echo=True,
> > description_encoding='utf8')
> >
> > colname = u'Заказ.Номер заказа'
> >
> > m = MetaData()
> > t = Table(u"Заказы", m, Column(colname, String(30), key='somecol'))
> >
> > m.drop_all(engine)
> > m.create_all(engine)
> >
> > engine.execute(t.insert().values(somecol='some value'))
> > result = engine.execute(t.select().where(t.c.somecol == 'some value'))
> > row = result.fetchone()
> > print row[t.c.somecol]
> yeah this is the workaround for now, but totally this is a bug back to
> 0.8 and further, should be backported for 0.8, 0.9 and 1.0 in
>
> https://bitbucket.org/zzzeek/sqlalchemy/issue/3091/update-description_encoding-for-pyodbc
> .
> Two different issues located.
>
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Re: [sqlalchemy] Could not locate column in row for column
On 6/20/14, 12:14 PM, Mike Bayer wrote:
> On 6/20/14, 7:32 AM, Mike Bayer wrote:
>> NoSuchColumnError: "Could not locate column in row for column
>> '\\u0417\\u0430\\u043a\\u0430\\u0437\\u044b.\\u041d\\u043e\\u043c\\u0435\\u0440
>> \\u0437\\u0430\\u043a\\u0430\\u0437\\u0430'"
>>
>> The problem is i can't really debug this error because it isn't clear
>> what should be in pk_cols
>>
>> Previously in orm/loading.py there is a string
>> pk_cols = mapper.primary_key # line number 250
>>
>> So, pk_cols is a list of Column() objects.
>> row is a list of values from query
>> Surely, [row[column] for column in pk_cols] raises error, because
>> column is a Column() object and can't be index for row. But i can't
>> imagine how this code may work. Is this a bug?
>> the ResultProxy contains translation logic that receives Column objects
>> and locates the data by name. This is documented at
>> http://docs.sqlalchemy.org/en/rel_0_9/core/tutorial.html#selecting and
>> is the primary method by which the ORM relates mapped columns to result
>> sets.
>>
>> In this case the issue is most likely yet another pyodbc + unicode
>> encoding issue, of which there are many, and often there's no way to
>> work around. Need to know 1. OS platform 2. FreeTDS version 3. UnixODBC
>> or iODBC (and what version) 4. pyodbc version 5. SQL Server version. I
>> can try to test but often these unicode issues aren't easy to resolve
>> (have you tried pymssql? ).thanks.
> good news, I can reproduce this, and on my end at least it needs the
> so-called "description_encoding" workaround. We may have to revisit
> the defaults on this parameter for modern versions of Pyodbc. The test
> below produces your error without the param, resolves with it. Please
> try this out on your create_engine(), thanks.
>
> #! coding: utf-8
>
> from sqlalchemy import *
>
> engine = create_engine("mssql+pyodbc://scott:tiger@ms_2008", echo=True,
> description_encoding='utf8')
>
> colname = u'Заказ.Номер заказа'
>
> m = MetaData()
> t = Table(u"Заказы", m, Column(colname, String(30), key='somecol'))
>
> m.drop_all(engine)
> m.create_all(engine)
>
> engine.execute(t.insert().values(somecol='some value'))
> result = engine.execute(t.select().where(t.c.somecol == 'some value'))
> row = result.fetchone()
> print row[t.c.somecol]
yeah this is the workaround for now, but totally this is a bug back to
0.8 and further, should be backported for 0.8, 0.9 and 1.0 in
https://bitbucket.org/zzzeek/sqlalchemy/issue/3091/update-description_encoding-for-pyodbc.
Two different issues located.
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Re: [sqlalchemy] Could not locate column in row for column
On 6/20/14, 7:32 AM, Mike Bayer wrote:
> NoSuchColumnError: "Could not locate column in row for column
> '\\u0417\\u0430\\u043a\\u0430\\u0437\\u044b.\\u041d\\u043e\\u043c\\u0435\\u0440
> \\u0437\\u0430\\u043a\\u0430\\u0437\\u0430'"
>
> The problem is i can't really debug this error because it isn't clear
> what should be in pk_cols
>
> Previously in orm/loading.py there is a string
> pk_cols = mapper.primary_key # line number 250
>
> So, pk_cols is a list of Column() objects.
> row is a list of values from query
> Surely, [row[column] for column in pk_cols] raises error, because
> column is a Column() object and can't be index for row. But i can't
> imagine how this code may work. Is this a bug?
> the ResultProxy contains translation logic that receives Column objects
> and locates the data by name. This is documented at
> http://docs.sqlalchemy.org/en/rel_0_9/core/tutorial.html#selecting and
> is the primary method by which the ORM relates mapped columns to result
> sets.
>
> In this case the issue is most likely yet another pyodbc + unicode
> encoding issue, of which there are many, and often there's no way to
> work around. Need to know 1. OS platform 2. FreeTDS version 3. UnixODBC
> or iODBC (and what version) 4. pyodbc version 5. SQL Server version. I
> can try to test but often these unicode issues aren't easy to resolve
> (have you tried pymssql? ).thanks.
good news, I can reproduce this, and on my end at least it needs the
so-called "description_encoding" workaround. We may have to revisit
the defaults on this parameter for modern versions of Pyodbc. The test
below produces your error without the param, resolves with it. Please
try this out on your create_engine(), thanks.
#! coding: utf-8
from sqlalchemy import *
engine = create_engine("mssql+pyodbc://scott:tiger@ms_2008", echo=True,
description_encoding='utf8')
colname = u'Заказ.Номер заказа'
m = MetaData()
t = Table(u"Заказы", m, Column(colname, String(30), key='somecol'))
m.drop_all(engine)
m.create_all(engine)
engine.execute(t.insert().values(somecol='some value'))
result = engine.execute(t.select().where(t.c.somecol == 'some value'))
row = result.fetchone()
print row[t.c.somecol]
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Re: [sqlalchemy] Could not locate column in row for column
On 6/20/14, 3:59 AM, Belegnar Dragon wrote:
> Hello.
>
> SQLAlchemy 0.9.4
>
> In this code
>
> def unidecode_column_name(inspector, table, column_info):
> column_info['key'] = unidecode(column_info['name']).replace(u' ',
> u'_')
>
> engine = create_engine("mssql+pyodbc://%s:%s@RTBD" %
> (settings.RT_USER, settings.RT_PWD), echo = True)
> metadata = MetaData(bind = engine)
> metadata.reflect(engine, only = [u"Заказы",], listeners =
> [('column_reflect', unidecode_column_name)])
> orders = metadata.tables[u'Заказы']
> class Order(object):
> pass
> mapper(Order, orders)
>
> sess = Session(engine)
> q = sess.query(Order)
> q.filter_by(Kod_zakazchika = u'F07301m').all()
>
> I've got the following error
>
> NoSuchColumnError Traceback (most recent call
> last)
> in ()
> > 1 q.filter_by(Kod_zakazchika = u'F07301m').all()
>
> local/lib/python2.7/site-packages/sqlalchemy/orm/query.pyc in all(self)
>2290
>2291 """
> -> 2292 return list(self)
>2293
>2294 @_generative(_no_clauseelement_condition)
>
> local/lib/python2.7/site-packages/sqlalchemy/orm/loading.py in
> instances(query, cursor, context)
> 70 process[0](row, rows)
> 71 elif single_entity:
> ---> 72 rows = [process[0](row, None) for row in fetch]
> 73 else:
> 74 rows = [util.KeyedTuple([proc(row, None) for proc
> in process],
>
> local/lib/python2.7/site-packages/sqlalchemy/orm/loading.py in
> _instance(row, result)
> 359 identitykey = (
> 360 identity_class,
> --> 361 tuple([row[column] for column in
> pk_cols])
> 362 )
> 363
>
> local/lib/python2.7/site-packages/sqlalchemy/engine/result.pyc in
> _key_fallback(self, key, raiseerr)
> 330 raise exc.NoSuchColumnError(
> 331 "Could not locate column in row for column
> '%s'" %
> --> 332 expression._string_or_unprintable(key))
> 333 else:
> 334 return None
>
> NoSuchColumnError: "Could not locate column in row for column
> '\\u0417\\u0430\\u043a\\u0430\\u0437\\u044b.\\u041d\\u043e\\u043c\\u0435\\u0440
> \\u0437\\u0430\\u043a\\u0430\\u0437\\u0430'"
>
> The problem is i can't really debug this error because it isn't clear
> what should be in pk_cols
>
> Previously in orm/loading.py there is a string
> pk_cols = mapper.primary_key # line number 250
>
> So, pk_cols is a list of Column() objects.
> row is a list of values from query
> Surely, [row[column] for column in pk_cols] raises error, because
> column is a Column() object and can't be index for row. But i can't
> imagine how this code may work. Is this a bug?
the ResultProxy contains translation logic that receives Column objects
and locates the data by name. This is documented at
http://docs.sqlalchemy.org/en/rel_0_9/core/tutorial.html#selecting and
is the primary method by which the ORM relates mapped columns to result
sets.
In this case the issue is most likely yet another pyodbc + unicode
encoding issue, of which there are many, and often there's no way to
work around. Need to know 1. OS platform 2. FreeTDS version 3. UnixODBC
or iODBC (and what version) 4. pyodbc version 5. SQL Server version. I
can try to test but often these unicode issues aren't easy to resolve
(have you tried pymssql? ).thanks.
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[sqlalchemy] Could not locate column in row for column
Hello.
SQLAlchemy 0.9.4
In this code
def unidecode_column_name(inspector, table, column_info):
column_info['key'] = unidecode(column_info['name']).replace(u' ', u'_')
engine = create_engine("mssql+pyodbc://%s:%s@RTBD" % (settings.RT_USER,
settings.RT_PWD), echo = True)
metadata = MetaData(bind = engine)
metadata.reflect(engine, only = [u"Заказы",], listeners =
[('column_reflect', unidecode_column_name)])
orders = metadata.tables[u'Заказы']
class Order(object):
pass
mapper(Order, orders)
sess = Session(engine)
q = sess.query(Order)
q.filter_by(Kod_zakazchika = u'F07301m').all()
I've got the following error
NoSuchColumnError Traceback (most recent call last)
in ()
> 1 q.filter_by(Kod_zakazchika = u'F07301m').all()
local/lib/python2.7/site-packages/sqlalchemy/orm/query.pyc in all(self)
2290
2291 """
-> 2292 return list(self)
2293
2294 @_generative(_no_clauseelement_condition)
local/lib/python2.7/site-packages/sqlalchemy/orm/loading.py in
instances(query, cursor, context)
70 process[0](row, rows)
71 elif single_entity:
---> 72 rows = [process[0](row, None) for row in fetch]
73 else:
74 rows = [util.KeyedTuple([proc(row, None) for proc in
process],
local/lib/python2.7/site-packages/sqlalchemy/orm/loading.py in
_instance(row, result)
359 identitykey = (
360 identity_class,
--> 361 tuple([row[column] for column in
pk_cols])
362 )
363
local/lib/python2.7/site-packages/sqlalchemy/engine/result.pyc in
_key_fallback(self, key, raiseerr)
330 raise exc.NoSuchColumnError(
331 "Could not locate column in row for column
'%s'" %
--> 332 expression._string_or_unprintable(key))
333 else:
334 return None
NoSuchColumnError: "Could not locate column in row for column
'\\u0417\\u0430\\u043a\\u0430\\u0437\\u044b.\\u041d\\u043e\\u043c\\u0435\\u0440
\\u0437\\u0430\\u043a\\u0430\\u0437\\u0430'"
The problem is i can't really debug this error because it isn't clear what
should be in pk_cols
Previously in orm/loading.py there is a string
pk_cols = mapper.primary_key # line number 250
So, pk_cols is a list of Column() objects.
row is a list of values from query
Surely, [row[column] for column in pk_cols] raises error, because column is
a Column() object and can't be index for row. But i can't imagine how this
code may work. Is this a bug?
--
WBR,
Belegnar
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Re: [sqlalchemy] Could not locate column in row for column
updated pymysql to version 0.6.1 and it worked for me. thx alot
2014-02-12 19:27 GMT+02:00 Michael Bayer :
> And you updated pymysql? Or no?
>
> Sent from my iPhone
>
> On Feb 12, 2014, at 10:56 AM, Igal Kreimer wrote:
>
> yes it does. exactly the same problem, copy pasted ur code and received:
>
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 2264, in all
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in instances
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 74, in
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 3440, in proc
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 71, in __getitem__
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 317, in _key_fallback
> sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
> column 'a.id'"
>
>
> 2014-02-12 16:26 GMT+02:00 Michael Bayer :
>
>>
>> On Feb 12, 2014, at 4:49 AM, Igal Kreimer wrote:
>>
>> > Hello sqlalchemy team.
>> >
>> > im a new user to the alchemy, and doing the tutorial on ur site.
>> > ran ur tutorial on adding information to databases and querying against
>> a virtual db (sqlite in memory)
>> >
>> > after i thought i got that, i tried testing against a real db - mysql
>> db.
>> > im using the driver of pymysql version 0.4 (i know its kinda old, but
>> when was using newer version i had other bugs, not related to this topic).
>>
>> OK well definitely get on the latest pymysql, that driver is not super
>> mature so you want to be on the latest. I tried 0.6.1 here and can't
>> reproduce your issue.
>>
>>
>> >
>> > Traceback (most recent call last):
>> > File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line
>> 39, in
>> > read_from_DB()
>> > File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line
>> 26, in read_from_DB
>> > print(str(session.query(CpuTable.id.label('id')).all()))
>> > File
>> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
>> line 2264, in all
>> > File
>> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
>> line 75, in instances
>> > File
>> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
>> line 75, in
>> > File
>> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
>> line 74, in
>> > File
>> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
>> line 3440, in proc
>> > File
>> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
>> line 71, in __getitem__
>> > File
>> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
>> line 317, in _key_fallback
>> > sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
>> column 'cpu.id'"
>>
>> yes that's a totally strange issue that I cannot reproduce, running SQLA
>> 0.9.0 / py3.3 / pymysql.
>>
>> one thing that *may* be going wrong is that I see you're on windows, and
>> there might be case sensitivity issues happening. Though I'm not really
>> sure how, I can use any name for the label and of course it works.
>>
>> here's the test case I'm using, you get the same results with this?
>>
>> from sqlalchemy import *
>> from sqlalchemy.orm import *
>> from sqlalchemy.ext.declarative import declarative_base
>>
>> Base = declarative_base()
>>
>> class A(Base):
>> __tablename__ = 'a'
>>
>> id = Column(Integer, primary_key=True)
>>
>> e = create_engine("mysql+pymysql://scott:tiger@localhost/test",
>> echo=True)
>> Base.metadata.drop_all(e)
>> Base.metadata.create_all(e)
>>
>> sess = Session(e)
>> sess.add_all([A(), A(), A()])
>>
>> print(sess.query(A.id.label('id')).all())
>> print(sess.query(A.id.label('foobar')).all())
>>
>>
>>
>>
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Re: [sqlalchemy] Could not locate column in row for column
And you updated pymysql? Or no?
Sent from my iPhone
> On Feb 12, 2014, at 10:56 AM, Igal Kreimer wrote:
>
> yes it does. exactly the same problem, copy pasted ur code and received:
>
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 2264, in all
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in instances
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 74, in
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 3440, in proc
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 71, in __getitem__
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 317, in _key_fallback
> sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for column
> 'a.id'"
>
>
> 2014-02-12 16:26 GMT+02:00 Michael Bayer :
>>
>> On Feb 12, 2014, at 4:49 AM, Igal Kreimer wrote:
>>
>> > Hello sqlalchemy team.
>> >
>> > im a new user to the alchemy, and doing the tutorial on ur site.
>> > ran ur tutorial on adding information to databases and querying against a
>> > virtual db (sqlite in memory)
>> >
>> > after i thought i got that, i tried testing against a real db - mysql db.
>> > im using the driver of pymysql version 0.4 (i know its kinda old, but when
>> > was using newer version i had other bugs, not related to this topic).
>>
>> OK well definitely get on the latest pymysql, that driver is not super
>> mature so you want to be on the latest. I tried 0.6.1 here and can’t
>> reproduce your issue.
>>
>>
>> >
>> > Traceback (most recent call last):
>> > File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 39,
>> > in
>> > read_from_DB()
>> > File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 26,
>> > in read_from_DB
>> > print(str(session.query(CpuTable.id.label('id')).all()))
>> > File
>> > "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
>> > line 2264, in all
>> > File
>> > "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
>> > line 75, in instances
>> > File
>> > "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
>> > line 75, in
>> > File
>> > "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
>> > line 74, in
>> > File
>> > "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
>> > line 3440, in proc
>> > File
>> > "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
>> > line 71, in __getitem__
>> > File
>> > "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
>> > line 317, in _key_fallback
>> > sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
>> > column 'cpu.id’"
>>
>> yes that’s a totally strange issue that I cannot reproduce, running SQLA
>> 0.9.0 / py3.3 / pymysql.
>>
>> one thing that *may* be going wrong is that I see you’re on windows, and
>> there might be case sensitivity issues happening. Though I’m not really
>> sure how, I can use any name for the label and of course it works.
>>
>> here’s the test case I’m using, you get the same results with this?
>>
>> from sqlalchemy import *
>> from sqlalchemy.orm import *
>> from sqlalchemy.ext.declarative import declarative_base
>>
>> Base = declarative_base()
>>
>> class A(Base):
>> __tablename__ = 'a'
>>
>> id = Column(Integer, primary_key=True)
>>
>> e = create_engine("mysql+pymysql://scott:tiger@localhost/test", echo=True)
>> Base.metadata.drop_all(e)
>> Base.metadata.create_all(e)
>>
>> sess = Session(e)
>> sess.add_all([A(), A(), A()])
>>
>> print(sess.query(A.id.label('id')).all())
>> print(sess.query(A.id.label('foobar')).all())
>
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Re: [sqlalchemy] Could not locate column in row for column
yes it does. exactly the same problem, copy pasted ur code and received:
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
line 2264, in all
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
line 75, in instances
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
line 75, in
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
line 74, in
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
line 3440, in proc
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
line 71, in __getitem__
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
line 317, in _key_fallback
sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
column 'a.id'"
2014-02-12 16:26 GMT+02:00 Michael Bayer :
>
> On Feb 12, 2014, at 4:49 AM, Igal Kreimer wrote:
>
> > Hello sqlalchemy team.
> >
> > im a new user to the alchemy, and doing the tutorial on ur site.
> > ran ur tutorial on adding information to databases and querying against
> a virtual db (sqlite in memory)
> >
> > after i thought i got that, i tried testing against a real db - mysql db.
> > im using the driver of pymysql version 0.4 (i know its kinda old, but
> when was using newer version i had other bugs, not related to this topic).
>
> OK well definitely get on the latest pymysql, that driver is not super
> mature so you want to be on the latest. I tried 0.6.1 here and can't
> reproduce your issue.
>
>
> >
> > Traceback (most recent call last):
> > File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 39,
> in
> > read_from_DB()
> > File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 26,
> in read_from_DB
> > print(str(session.query(CpuTable.id.label('id')).all()))
> > File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 2264, in all
> > File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in instances
> > File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in
> > File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 74, in
> > File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 3440, in proc
> > File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 71, in __getitem__
> > File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 317, in _key_fallback
> > sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
> column 'cpu.id'"
>
> yes that's a totally strange issue that I cannot reproduce, running SQLA
> 0.9.0 / py3.3 / pymysql.
>
> one thing that *may* be going wrong is that I see you're on windows, and
> there might be case sensitivity issues happening. Though I'm not really
> sure how, I can use any name for the label and of course it works.
>
> here's the test case I'm using, you get the same results with this?
>
> from sqlalchemy import *
> from sqlalchemy.orm import *
> from sqlalchemy.ext.declarative import declarative_base
>
> Base = declarative_base()
>
> class A(Base):
> __tablename__ = 'a'
>
> id = Column(Integer, primary_key=True)
>
> e = create_engine("mysql+pymysql://scott:tiger@localhost/test", echo=True)
> Base.metadata.drop_all(e)
> Base.metadata.create_all(e)
>
> sess = Session(e)
> sess.add_all([A(), A(), A()])
>
> print(sess.query(A.id.label('id')).all())
> print(sess.query(A.id.label('foobar')).all())
>
>
>
>
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Re: [sqlalchemy] Could not locate column in row for column
On Feb 12, 2014, at 4:49 AM, Igal Kreimer wrote:
> Hello sqlalchemy team.
>
> im a new user to the alchemy, and doing the tutorial on ur site.
> ran ur tutorial on adding information to databases and querying against a
> virtual db (sqlite in memory)
>
> after i thought i got that, i tried testing against a real db - mysql db.
> im using the driver of pymysql version 0.4 (i know its kinda old, but when
> was using newer version i had other bugs, not related to this topic).
OK well definitely get on the latest pymysql, that driver is not super mature
so you want to be on the latest. I tried 0.6.1 here and can’t reproduce your
issue.
>
> Traceback (most recent call last):
> File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 39, in
>
> read_from_DB()
> File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 26, in
> read_from_DB
> print(str(session.query(CpuTable.id.label('id')).all()))
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 2264, in all
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in instances
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 75, in
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
> line 74, in
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
> line 3440, in proc
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 71, in __getitem__
> File
> "C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
> line 317, in _key_fallback
> sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for column
> 'cpu.id’"
yes that’s a totally strange issue that I cannot reproduce, running SQLA 0.9.0
/ py3.3 / pymysql.
one thing that *may* be going wrong is that I see you’re on windows, and there
might be case sensitivity issues happening. Though I’m not really sure how, I
can use any name for the label and of course it works.
here’s the test case I’m using, you get the same results with this?
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class A(Base):
__tablename__ = 'a'
id = Column(Integer, primary_key=True)
e = create_engine("mysql+pymysql://scott:tiger@localhost/test", echo=True)
Base.metadata.drop_all(e)
Base.metadata.create_all(e)
sess = Session(e)
sess.add_all([A(), A(), A()])
print(sess.query(A.id.label('id')).all())
print(sess.query(A.id.label('foobar')).all())
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[sqlalchemy] Could not locate column in row for column
Hello sqlalchemy team.
im a new user to the alchemy, and doing the tutorial on ur site.
ran ur tutorial on adding information to databases and querying against a
virtual db (sqlite in memory)
after i thought i got that, i tried testing against a real db - mysql db.
im using the driver of pymysql version 0.4 (i know its kinda old, but when
was using newer version i had other bugs, not related to this topic).
my code is as follows:
import sqlalchemy
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from CpuTable import CpuTable
def read_from_DB():
engine = create_engine('mysql+pymysql://***@***/test', echo=True)
Session = sessionmaker(bind=engine)
session=Session()
#insert = CpuTable(id='15',name= 'igal')
#session.add(insert)
#session.commit()
print()
print(str(session.query(CpuTable.id.label('id')).all()))
for cpu_id,cpu_name in session.query(CpuTable).all():
print(cpu_id,cpu_name)
my stack trace is as follows:
C:\Python33\python.exe J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py
2014-02-12 11:23:57,193 INFO sqlalchemy.engine.base.Engine SELECT DATABASE()
2014-02-12 11:23:57,193 INFO sqlalchemy.engine.base.Engine ()
2014-02-12 11:23:57,196 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES
LIKE 'character_set%%'
2014-02-12 11:23:57,196 INFO sqlalchemy.engine.base.Engine ()
2014-02-12 11:23:57,198 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES
LIKE 'sql_mode'
2014-02-12 11:23:57,198 INFO sqlalchemy.engine.base.Engine ()
2014-02-12 11:23:57,199 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)
2014-02-12 11:23:57,199 INFO sqlalchemy.engine.base.Engine SELECT cpu.id AS
id
FROM cpu
2014-02-12 11:23:57,199 INFO sqlalchemy.engine.base.Engine ()
Traceback (most recent call last):
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
line 69, in __getitem__
KeyError:
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 39, in
read_from_DB()
File "J:/working_dir/TLM/lib/DB_Wrapper/Lab_DB/DB_Reader.py", line 26, in
read_from_DB
print(str(session.query(CpuTable.id.label('id')).all()))
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
line 2264, in all
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
line 75, in instances
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
line 75, in
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
line 74, in
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\query.py",
line 3440, in proc
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
line 71, in __getitem__
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\engine\result.py",
line 317, in _key_fallback
sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
column 'cpu.id'"
when debugging this issue, i managed to find out that i do get the result
from the db, only if the quesry was "select table.id" it returns as
"table_id". (i talked with some friends using this, and they confirmed it
happens on their hand as well, only their sqlalchemy wrapper knows how to
handle with this, while mine throws this error) . the commented out insert
lines are to check i had connection to the db, and also to check it inserts
the data, and it does, the query part is the problem. also while testing
this against the sqlite in memory db it does work.
hence my question is what can be the problem when working against mysql db
with pymysql driver?
tried searching the web for 1 day for similar problems couldnt find even 1.
my sqlalchemy version was 0.9.1 and i downgraded it to 0.9 and still the
problem persists.
thx
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