django postgreSQL连接问题

django postgreSQL connection problem

我在连接Django中的PostgreSql时遇到了问题

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>>python manage.py shell
>>> FROM django.db import connection
>>> cursor = connection.cursor()
Traceback (most recent CALL LAST):
File"", line 1, IN
File"/usr/local/lib/python2.6/dist-packages/django/db/backends/__init__.py", line 250, IN cursor
cursor = SELF.make_debug_cursor(SELF._cursor())
File"/usr/local/lib/python2.6/dist-packages/django/db/backends/postgresql_psycopg2/base.py", line 148, IN _cursor
cursor.execute("SET TIME ZONE %s", [settings_dict['TIME_ZONE']])
DataError: unrecognized TIME zone name:"America/Chicago"

但是，当我尝试

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>>> c=connection.cursor()
>>> c

>>> c.execute("select * from test")
Traceback (most recent CALL LAST):
File"", line 1, IN
File"/usr/local/lib/python2.6/dist-packages/django/db/backends/util.py", line 34, IN EXECUTE
RETURN SELF.cursor.execute(SQL, params)
File"/usr/local/lib/python2.6/dist-packages/django/db/backends/postgresql_psycopg2/base.py", line 44, IN EXECUTE
RETURN SELF.cursor.execute(query, args)
DatabaseError: CURRENT TRANSACTION IS aborted, commands ignored until END OF TRANSACTION block

>>> connection.commit()
Traceback (most recent CALL LAST):
File"", line 1, IN
File"/usr/local/lib/python2.6/dist-packages/django/db/backends/__init__.py", line 202, IN commit
SELF.set_clean()
File"/usr/local/lib/python2.6/dist-packages/django/db/backends/__init__.py", line 147, IN set_clean
raise TransactionManagementError("This code isn't under transaction management")
TransactionManagementError: This code isn't under transaction management
>>> c.execute("select * from test")
>>> c.fetchone()
(1, 100, u'abd')

我不知道问题出在哪里
我做谷歌，但它没有帮助，任何人都可以帮忙吗？非常感谢。
我的设置是：

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DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2', # ADD 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' OR 'oracle'.
'NAME': 'mydb', # OR path TO DATABASE file IF USING sqlite3.
'USER': 'postgres', # NOT used WITH sqlite3.
'PASSWORD': '123', # NOT used WITH sqlite3.
'HOST': '/tmp', # SET TO empty string FOR localhost. NOT used WITH sqlite3.
'PORT': '5432', # SET TO empty string FOR DEFAULT. NOT used WITH sqlite3.
#'OPTIONS':TRUE,
}
}