Re: [sqlalchemy] Re: ObjectDeletedError: Instance 'xxx' has been deleted
Hi, Michael Bayer.
Thanks, that example is really helpful.
In your example I used
*Session.object_session*http://docs.sqlalchemy.org/en/latest/orm/session.html#sqlalchemy.orm.session.Session.object_sessionmethod
to verify that main_method
and method1 running in two different sessions.
But my test result showing that main_method and method1 running in same
session.
I think, we can check this using method *Session.object_session** *, I am
not sure about that.
* added following code in main_method
s1 = Session.object_session(db_obj1)
print ===main_methodsession=, vars(s1)
* added following code in method1
s2 = Session.object_session(db_obj2)
print ===method1session=, vars(s2)
*Result
=*
*===main_methodsession=* {'autocommit': False, 'autoflush':
True, 'transaction': sqlalchemy.orm.session.SessionTransaction object at
0x22a5f90, *'hash_key': 36330896*, 'expire_on_commit': True, '_new': {},
'bind': Engine(mysql://root:cvt@localhost/cvt_ee), '_deleted': {},
'_flushing': False, 'identity_map': {(class '__main__.A', (1L,)):
sqlalchemy.orm.state.InstanceState object at 0x22a5c90},
'_enable_transaction_accounting': True, 'extensions': [], '_identity_cls':
class 'sqlalchemy.orm.identity.WeakInstanceDict', 'twophase': False,
'_Session__binds': {}, '_query_cls': class 'sqlalchemy.orm.query.Query',
'_mapper_flush_opts': {}}
===method1session= {'autocommit': False, 'autoflush': True,
'transaction': sqlalchemy.orm.session.SessionTransaction object at
0x2073190,* 'hash_key': 36330896,* 'expire_on_commit': True, '_new': {},
'bind': Engine(mysql://root:cvt@localhost/cvt_ee), '_deleted': {},
'_flushing': False, 'identity_map': {(class '__main__.A', (2L,)):
sqlalchemy.orm.state.InstanceState object at 0x2073550, (class
'__main__.A', (1L,)): sqlalchemy.orm.state.InstanceState object at
0x22a5c90}, '_enable_transaction_accounting': True, 'extensions': [],
'_identity_cls': class 'sqlalchemy.orm.identity.WeakInstanceDict',
'twophase': False, '_Session__binds': {}, '_query_cls': class
'sqlalchemy.orm.query.Query', '_mapper_flush_opts': {}}
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Re: [sqlalchemy] Re: ObjectDeletedError: Instance 'xxx' has been deleted
On Nov 17, 2012, at 1:16 AM, sajuptpm wrote: H, Michael Bayer Thanks You are correct, the rollback in method1 rollbacking transaction in main_method. I want to isolate transaction in main_method from rollback in method1. I attached more code. from sqlalchemy.orm import scoped_session, sessionmaker maker = sessionmaker(autoflush=True, autocommit=False,expire_on_commit=False, extension=ZopeTransactionExtension()) zopelessmaker = sessionmaker(autoflush=True, \ autocommit=False, \ expire_on_commit=False) DBSession = scoped_session(maker) def main_method(): db_obj1 = DBModelclass1(Hello) DBSession.add(db_obj1) DBSession.fush() for x in lst: try: method1(db_obj1.id) excpt Exception, ex: pass def method1(id): try: s1 = DBSession() s1.begin_nested() db_obj2 = DBModelclass2(Test) db_obj2.refname = name_%s %(id) DBSession.add(db_obj2) DBSession.fush() if some-codition: raise Exception(Failedd) s1.commit() except Exception, ex: s1.rollback() raise ex other than the typos, as well as the multiple calls to method1() for every x in a list where the x is apparently ignored, there is nothing obviously wrong with this code. If you're using begin_nested(), it has to be on a platform that supports SAVEPOINT. Currently Postgresql and MySQL with InnoDB are the two main platforms supported. As I have already stated in my previous email, turning on echo=True and/or echo='debug' will illustrate the SQL being emitted as well as where transactions start and end. This is a *critical* step to being able to understand your issue. I'd also recommend using pdb so that you can step into the code and examine the state of the database and program state one line at a time. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
[sqlalchemy] Re: ObjectDeletedError: Instance 'xxx' has been deleted
The code bellow throwing error ObjectDeletedError: Instance 'xxx' has been deleted. when a exception throwing from method1. Eroor in line method1(db_obj1.id), db_obj1.id failing. How fix this issue. def main_method(): DBSession.add(db_obj1) DBSession.fush() for x in lst: try: method1(db_obj1.id) excpt Exception, ex: pass def method1(id): try: s1 = DBSession() s1.begin_nested() db_obj2 = create_new_obj(id) DBSession.add(db_obj1) DBSession.fush() if some-codition: raise Exception(Failedd) s1.commit() except Exception, ex: s1.rollback() raise ex -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/ya-rKw3XinwJ. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
Re: [sqlalchemy] Re: ObjectDeletedError: Instance 'xxx' has been deleted
H, Michael Bayer Thanks You are correct, the rollback in method1 rollbacking transaction in main_method. I want to isolate transaction in main_method from rollback in method1. I attached more code. from sqlalchemy.orm import scoped_session, sessionmaker maker = sessionmaker(autoflush=True, autocommit=False,expire_on_commit=False, extension=ZopeTransactionExtension()) zopelessmaker = sessionmaker(autoflush=True, \ autocommit=False, \ expire_on_commit=False) DBSession = scoped_session(maker) def main_method(): db_obj1 = DBModelclass1(Hello) DBSession.add(db_obj1) DBSession.fush() for x in lst: try: method1(db_obj1.id) excpt Exception, ex: pass def method1(id): try: s1 = DBSession() s1.begin_nested() db_obj2 = DBModelclass2(Test) db_obj2.refname = name_%s %(id) DBSession.add(db_obj2) DBSession.fush() if some-codition: raise Exception(Failedd) s1.commit() except Exception, ex: s1.rollback() raise ex -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/uIJwy6KOAdsJ. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
