Sorry, I meant NCLOB, not NVARCHAR.
2014-09-30 16:57 GMT-03:00 Mariano Mara <mariano.m...@gmail.com>:
> 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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