Update:
I dropped down to psycopg2 and was finally able to get a query to go
through doing the following:
conn = psycopg2.connect(**options)
conn.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)
cur = conn.cursor()
cur.execute("SELECT COUNT(*) FROM users;")
print cur.fetchone()
cur.close()
conn.close()
I noticed that in SA there isn't a ISOLATION_LEVEL_AUTOCOMMIT in the
isolation lookup in the PGDialect_psycopg2 dialect. Is the best way to go
forard to create my own dialect?
thanks,
Matt
On Saturday, February 16, 2013 1:12:20 PM UTC-6, matt g wrote:
>
> After seeing the announcement for Amazon Redshift yesterday I thought I
> would see how hard it's going to be to connect from psycopyg/SqlAlchemy. So
> far I'm not having any luck. Below is what I'm trying and the error that
> follows:
>
> engine = create_engine(URL('postgres', **options), poolclass=NullPool,
> execution_options={'no_parameters': True})
> conn = engine.connect()
>
> Traceback (most recent call last):
> File "redshift.py", line 14, in <module>
> conn = engine.connect()
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
>
> line 2472, in connect
> return self._connection_cls(self, **kwargs)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
>
> line 878, in __init__
> self.__connection = connection or engine.raw_connection()
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
>
> line 2558, in raw_connection
> return self.pool.unique_connection()
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/pool.py",
> line 183, in unique_connection
> return _ConnectionFairy(self).checkout()
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/pool.py",
> line 387, in __init__
> rec = self._connection_record = pool._do_get()
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/pool.py",
> line 802, in _do_get
> return self._create_connection()
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/pool.py",
> line 188, in _create_connection
> return _ConnectionRecord(self)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/pool.py",
> line 273, in __init__
> pool.dispatch.first_connect.exec_once(self.connection, self)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/event.py",
> line 282, in exec_once
> self(*args, **kw)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/event.py",
> line 291, in __call__
> fn(*args, **kw)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/strategies.py",
>
> line 167, in first_connect
> dialect.initialize(c)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/dialects/postgresql/base.py",
>
> line 1000, in initialize
> super(PGDialect, self).initialize(connection)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/default.py",
>
> line 171, in initialize
> self._get_server_version_info(connection)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/dialects/postgresql/base.py",
>
> line 1184, in _get_server_version_info
> v = connection.execute("select version()").scalar()
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
>
> line 1449, in execute
> params)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
>
> line 1628, in _execute_text
> statement, parameters
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
>
> line 1698, in _execute_context
> context)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
>
> line 1685, in _execute_context
> context)
> File
> "/Users/matt/envs/health/lib/python2.7/site-packages/sqlalchemy/engine/default.py",
>
> line 334, in do_execute_no_params
> cursor.execute(statement)
> sqlalchemy.exc.ProgrammingError: (ProgrammingError) permission denied to
> set parameter "transaction_isolation" to "serializable"
> 'select version()' {}
>
> Any ideas?
>
> thanks,
> Matt
>
>
>
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