Since upgrading to 0.3.8 (from 0.3.6), I've run in to a problem with long
identifiers. It seems that _truncate_bindparam is being applied to both
parts of the ClauseElements (that is, the parts both before and after the
AS), and is testing >= (instead of >) max_identifier_length, so that when I
have a column identifier that is the maximum length, it ends up creating a
"no such column" error.
An example test-case follows:
from sqlalchemy import *
from sqlalchemy.engine.url import URL
class Underwriter(object):
def __init__(self, source, explan):
self.primaryHeatSource = source
self.primaryHeatSourceExplan = explan
def init_database(db):
metadata = BoundMetaData(db)
underwriting = Table('und_underwriting_tbl', metadata,
Column('und_underwriting_id', Integer, primary_key=True,
key='id'),
Column('und_primary_heat_source', String(20),
key='primaryHeatSource'),
Column('und_primary_heat_source_explan', String(100),
key='primaryHeatSourceExplan'),
)
mapper(Underwriter, underwriting)
# Add a test record to the DB
session = create_session()
underwriting.create()
uw = Underwriter('bonfire', 'Maybe she lives in the woods?')
session.save(uw)
session.flush()
session.close()
db = create_engine(URL(drivername='sqlite', database=':memory:'))
# simulate running under Oracle
db.dialect.max_identifier_length = lambda: 30
db.echo = True
# insert for test record seems to work OK
init_database(db)
session = create_session()
# select, however, fails
query = session.query(Underwriter)
underwriters = query.select()
session.close()
Throws the following error (note the
"und_underwriting_tbl.und_primary_heat_source__1 AS
und_underwriting_tbl_und_2"):
...
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 602,
in _execute
sqlalchemy.exceptions.SQLError: (OperationalError) no such column:
und_underwriting_tbl.und_primary_heat_source__1 u'SELECT
und_underwriting_tbl.und_primary_heat_source__1 AS
und_underwriting_tbl_und_2, und_underwriting_tbl.und_underwriting_id AS
und_underwriting_tbl_und_3, und_underwriting_tbl.und_primary_heat_source AS
und_underwriting_tbl_und_4 \nFROM und_underwriting_tbl ORDER BY
und_underwriting_tbl.oid' []
Thank you,
Cory Johns
Systems
Tower Hill Insurance Group, Inc.
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