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: <sqlalchemy.sql.elements.Label object at 0x0000000003C6FDA0>
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
<module>
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 <listcomp>
File
"C:\Python33\lib\site-packages\sqlalchemy-0.9.0-py3.3.egg\sqlalchemy\orm\loading.py",
line 74, in <listcomp>
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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