SQLAlchemy的PK插入

Question

我想从与原始SQL查询插入新entrie PK ID与SQLAlchemy的这样 https://gist.github.com/greggyNapalm/6045595

>>> sys.version 
'2.7.3 (default, Aug 1 2012, 05:14:39) \n[GCC 4.6.3]' 
>>> sqlalchemy.__version__ 
'0.8.1' 
>>> from sqlalchemy import create_engine 
>>> engine = create_engine('postgresql://usr:psswd/db', convert_unicode=True, implicit_returning=True) 
>>> conn = engine.connect() 
>>> 
>>> rv = conn.execute('select * from engine') 
>>> [el for el in rv] 
[(1, u'phantom', u'Yandex cretaed IO engine.'), (2, u'jmeter', u'apache foundation load testing tool.')] 
>>> 
>>> rv = conn.execute('''insert into "engine" (name, description) values ('someth-new', 'New secr')''') 
>>> rv.inserted_primary_key 
Traceback (most recent call last): 
    File "<input>", line 1, in <module> 
    File "/home/gkomissarov/.virtualenvs/lunaport_server/local/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 614, in __get__ 
    obj.__dict__[self.__name__] = result = self.fget(obj) 
    File "/home/gkomissarov/.virtualenvs/lunaport_server/local/lib/python2.7/site-packages/sqlalchemy/engine/result.py", line 566, in inserted_primary_key 
    "Statement is not a compiled " 
InvalidRequestError: Statement is not a compiled expression construct. 
>>> 
>>> [el for el in rv] 
Traceback (most recent call last): 
    File "<input>", line 1, in <module> 
    File "/home/gkomissarov/.virtualenvs/lunaport_server/local/lib/python2.7/site-packages/sqlalchemy/engine/result.py", line 531, in __iter__ 
    row = self.fetchone() 
    File "/home/gkomissarov/.virtualenvs/lunaport_server/local/lib/python2.7/site-packages/sqlalchemy/engine/result.py", line 790, in fetchone 
    self.cursor, self.context) 
    File "/home/gkomissarov/.virtualenvs/lunaport_server/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1027, in _handle_dbapi_exception 
    util.reraise(*exc_info) 
    File "/home/gkomissarov/.virtualenvs/lunaport_server/local/lib/python2.7/site-packages/sqlalchemy/engine/result.py", line 720, in _non_resultmpl 
    "This result object does not return rows. " 
ResourceClosedError: This result object does not return rows. It has been closed automatically. 
>>> 
>>> [el for el in conn.execute('select * from engine')] 
[(1, u'phantom', u'Yandex cretaed IO engine.'), (2, u'jmeter', u'apache foundation load testing tool.'), (3, u'someth-new', u'New secr')] 

没有运气，我在做什么错？如何获得？

Answer 1

rv = conn.execute(''' 
    insert into "engine" (name, description) 
    values ('someth-new', 'New secr') 
    returning * 
''') 
[el for el in rv]