我是SQLAlchemy的新手，我正在尝试实现这个SQL：
SELECT
node.*,
alarms.*
FROM
node
LEFT JOIN
alarms ON alarms.nodeid = node.nodeid
WHERE
node.foreignid IN ('foreignid_1','foreignid_2','foreignid_3')
ORDER BY node.nodeid;
我想出了这个声明：
stmt = session.query(Node, Alarms).outerjoin(Alarms, Alarms.nodeid == Node.nodeid).filter(Node.foreignid.in_(['foreignid_1','foreignid_2','foreignid_3'])).order_by(asc(Node.nodeid))
results = stmt.all()
生成的SQL如下所示：
SELECT
node.nodeid AS node_nodeid,
node.dpname AS node_dpname,
node.nodecreatetime AS node_nodecreatetime,
node.nodeparentid AS node_nodeparentid,
node.nodetype AS node_nodetype,
node.nodesysoid AS node_nodesysoid,
node.nodesysname AS node_nodesysname,
node.nodesysdescription AS node_nodesysdescription,
node.nodesyslocation AS node_nodesyslocation,
node.nodesyscontact AS node_nodesyscontact,
node.nodelabel AS node_nodelabel,
node.nodelabelsource AS node_nodelabelsource,
node.nodenetbiosname AS node_nodenetbiosname,
node.nodedomainname AS node_nodedomainname,
node.operatingsystem AS node_operatingsystem,
node.lastcapsdpoll AS node_lastcapsdpoll,
node.foreignsource AS node_foreignsource,
node.foreignid AS node_foreignid,
alarms.alarmid AS alarms_alarmid,
alarms.eventuei AS alarms_eventuei,
alarms.dpname AS alarms_dpname,
alarms.nodeid AS alarms_nodeid,
alarms.ipaddr AS alarms_ipaddr,
alarms.serviceid AS alarms_serviceid,
alarms.reductionkey AS alarms_reductionkey,
alarms.alarmtype AS alarms_alarmtype,
alarms.counter AS alarms_counter,
alarms.severity AS alarms_severity,
alarms.lasteventid AS alarms_lasteventid,
alarms.firsteventtime AS alarms_firsteventtime,
alarms.lasteventtime AS alarms_lasteventtime,
alarms.firstautomationtime AS alarms_firstautomationtime,
alarms.lastautomationtime AS alarms_lastautomationtime,
alarms.description AS alarms_description,
alarms.logmsg AS alarms_logmsg,
alarms.operinstruct AS alarms_operinstruct,
alarms.tticketid AS alarms_tticketid,
alarms.tticketstate AS alarms_tticketstate,
alarms.mouseovertext AS alarms_mouseovertext,
alarms.suppresseduntil AS alarms_suppresseduntil,
alarms.suppresseduser AS alarms_suppresseduser,
alarms.suppressedtime AS alarms_suppressedtime,
alarms.alarmackuser AS alarms_alarmackuser,
alarms.alarmacktime AS alarms_alarmacktime,
alarms.managedobjectinstance AS alarms_managedobjectinstance,
alarms.managedobjecttype AS alarms_managedobjecttype,
alarms.applicationdn AS alarms_applicationdn,
alarms.ossprimarykey AS alarms_ossprimarykey,
alarms.x733alarmtype AS alarms_x733alarmtype,
alarms.x733probablecause AS alarms_x733probablecause,
alarms.qosalarmstate AS alarms_qosalarmstate,
alarms.clearkey AS alarms_clearkey,
alarms.ifindex AS alarms_ifindex,
alarms.eventparms AS alarms_eventparms
FROM
node
LEFT OUTER JOIN
alarms ON alarms.nodeid = node.nodeid
WHERE
node.foreignid IN ('foreignid_2' , 'foreignid_1', 'foreignid_3')
ORDER BY node.nodeid ASC
但它也会抛出此错误（来自iPython）：
In [86]: stmt = session.query(Node, Alarms).outerjoin(Alarms, Alarms.nodeid == Node.nodeid).filter(Node.foreignid.in_(['foreignid_1','foreignid_3','foreignid_2'])).order_by(asc(Node.nodeid))
In [87]: results = stmt.all()
---------------------------------------------------------------------------
InternalError Traceback (most recent call last)
<ipython-input-87-1110c354b407> in <module>()
----> 1 results = stmt.all()
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/query.pyc in all(self)
2113
2114 """
-> 2115 return list(self)
2116
2117 @_generative(_no_clauseelement_condition)
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/query.pyc in __iter__(self)
2225 if self._autoflush and not self._populate_existing:
2226 self.session._autoflush()
-> 2227 return self._execute_and_instances(context)
2228
2229 def _connection_from_session(self, **kw):
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/query.pyc in _execute_and_instances(self, querycontext)
2240 close_with_result=True)
2241
-> 2242 result = conn.execute(querycontext.statement, self._params)
2243 return self.instances(result, querycontext)
2244
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.pyc in execute(self, object, *multiparams, **params)
1447 object,
1448 multiparams,
-> 1449 params)
1450 else:
1451 raise exc.InvalidRequestError(
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.pyc in _execute_clauseelement(self, elem, multiparams, params)
1582 compiled_sql,
1583 distilled_params,
-> 1584 compiled_sql, distilled_params
1585 )
1586 if self._has_events:
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.pyc in _execute_context(self, dialect, constructor, statement, parameters, *args)
1696 parameters,
1697 cursor,
-> 1698 context)
1699 raise
1700
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.pyc in _execute_context(self, dialect, constructor, statement, parameters, *args)
1689 statement,
1690 parameters,
-> 1691 context)
1692 except Exception, e:
1693 self._handle_dbapi_exception(
/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/default.pyc in do_execute(self, cursor, statement, parameters, context)
329
330 def do_execute(self, cursor, statement, parameters, context=None):
--> 331 cursor.execute(statement, parameters)
332
333 def do_execute_no_params(self, cursor, statement, context=None):
InternalError: (InternalError) current transaction is aborted, commands ignored until end of transaction block
'SELECT node.nodeid AS node_nodeid, node.dpname AS node_dpname, node.nodecreatetime AS node_nodecreatetime, node.nodeparentid AS node_nodeparentid, node.nodetype AS node_nodetype, node.nodesysoid AS node_nodesysoid, node.nodesysname AS node_nodesysname, node.nodesysdescription AS node_nodesysdescription, node.nodesyslocation AS node_nodesyslocation, node.nodesyscontact AS node_nodesyscontact, node.nodelabel AS node_nodelabel, node.nodelabelsource AS node_nodelabelsource, node.nodenetbiosname AS node_nodenetbiosname, node.nodedomainname AS node_nodedomainname, node.operatingsystem AS node_operatingsystem, node.lastcapsdpoll AS node_lastcapsdpoll, node.foreignsource AS node_foreignsource, node.foreignid AS node_foreignid, alarms.alarmid AS alarms_alarmid, alarms.eventuei AS alarms_eventuei, alarms.dpname AS alarms_dpname, alarms.nodeid AS alarms_nodeid, alarms.ipaddr AS alarms_ipaddr, alarms.serviceid AS alarms_serviceid, alarms.reductionkey AS alarms_reductionkey, alarms.alarmtype AS alarms_alarmtype, alarms.counter AS alarms_counter, alarms.severity AS alarms_severity, alarms.lasteventid AS alarms_lasteventid, alarms.firsteventtime AS alarms_firsteventtime, alarms.lasteventtime AS alarms_lasteventtime, alarms.firstautomationtime AS alarms_firstautomationtime, alarms.lastautomationtime AS alarms_lastautomationtime, alarms.description AS alarms_description, alarms.logmsg AS alarms_logmsg, alarms.operinstruct AS alarms_operinstruct, alarms.tticketid AS alarms_tticketid, alarms.tticketstate AS alarms_tticketstate, alarms.mouseovertext AS alarms_mouseovertext, alarms.suppresseduntil AS alarms_suppresseduntil, alarms.suppresseduser AS alarms_suppresseduser, alarms.suppressedtime AS alarms_suppressedtime, alarms.alarmackuser AS alarms_alarmackuser, alarms.alarmacktime AS alarms_alarmacktime, alarms.managedobjectinstance AS alarms_managedobjectinstance, alarms.managedobjecttype AS alarms_managedobjecttype, alarms.applicationdn AS alarms_applicationdn, alarms.ossprimarykey AS alarms_ossprimarykey, alarms.x733alarmtype AS alarms_x733alarmtype, alarms.x733probablecause AS alarms_x733probablecause, alarms.qosalarmstate AS alarms_qosalarmstate, alarms.clearkey AS alarms_clearkey, alarms.ifindex AS alarms_ifindex, alarms.eventparms AS alarms_eventparms \nFROM node LEFT OUTER JOIN alarms ON alarms.nodeid = node.nodeid \nWHERE node.foreignid IN (%(foreignid_1)s, %(foreignid_2)s, %(foreignid_3)s) ORDER BY node.nodeid ASC' {'foreignid_1': 'foreignid_1', 'foreignid_3': 'foreignid_3', 'foreignid_2': 'foreignid_2'}
我只是不明白生成的SQL是好的时候错误是什么。
谢谢。
答案 0 :(得分：4)
您的异常与生成的SQL无关，这正是您想要的。
您的数据库连接处于错误状态;事务中止（可能是由于某处的完整性错误）并且没有启动新事务，并且您的数据库不喜欢这样。
在从iPython提示中尝试使用SQLAlchemy时，最好打开自动提交，这样您就不必处理事务管理的复杂性。