Hi there. I have some code that works ok in PG and now I need to make it
work with Oracle, however I am hitting this error with NVARCHAR and I am
not sure how to handle it.
First a small code in order you can reproduce it (as you can see "name" has
been defined as UnicodeText):
from sqlalchemy import create_engine, Integer, UnicodeText, Column, func
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
engine = create_engine('oracle://scott:tiger@localhost:1521/xe', echo=True)
Base = declarative_base()
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
name = Column(UnicodeText)
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()
qry = session.query(func.count('1'), User.name).group_by(User.name)
print(qry.all())
but each time I get to the actually execution of the query I hit the same
error (see below, it is related to the use of an UnicodeText field) and I
wonder if there is a way to avoid the issue transparently.
TIA,
Mariano
2014-09-30 16:48:12,028 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)
2014-09-30 16:48:12,029 INFO sqlalchemy.engine.base.Engine SELECT
count(:param_1) AS count_1, users.name AS users_name
FROM users GROUP BY users.name
2014-09-30 16:48:12,030 INFO sqlalchemy.engine.base.Engine {'param_1': '1'}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/orm/query.py",
line 2300, in all
return list(self)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/orm/query.py",
line 2412, in __iter__
return self._execute_and_instances(context)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/orm/query.py",
line 2427, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py",
line 729, in execute
return meth(self, multiparams, params)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/sql/elements.py",
line 321, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py",
line 826, in _execute_clauseelement
compiled_sql, distilled_params
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py",
line 958, in _execute_context
context)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py",
line 1160, in _handle_dbapi_exception
exc_info
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/util/compat.py",
line 199, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py",
line 951, in _execute_context
context)
File
"/home/mariano/Code/env/local/lib/python2.7/site-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/engine/default.py",
line 436, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.DatabaseError: (DatabaseError) ORA-00932: inconsistent
datatypes: expected - got NCLOB
'SELECT count(:param_1) AS count_1, users.name AS users_name \nFROM users
GROUP BY users.name' {'param_1': '1'}
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