python - SQLAlchemy + postgres : (InternalError) current transaction is aborted, commands ignored until end of transaction block -


i attempting save parent/children set of records, , want wrap inserts in transaction. using sqlalchemy postgresql 8.4.

here snippet of code:

def insert_data(parent, child_rows):     # start transaction     conn = _get_connection()     tran = conn.begin()      try:         sql = get_sql_from_parent(parent)         res = conn.execute(sql)  # <- code barfs @ line         item = res.fetchone() if res else none         parent_id = item['id'] if ((item) , ('id' in item)) else -1          if parent_id == -1:             raise exception('parent not saved in database')          # import children         child in child_rows:             child_sql = get_child_sql(parent_id, child)                                     conn.execute(child_sql)          tran.commit()      except integrityerror:         pass  # rollback?      except exception e:         tran.rollback()         print "exception in user code:"         print '-'*60         traceback.print_exc(file=sys.stdout)         print '-'*60

when invoke function, following stacktrace:

traceback (most recent call last):   file "import_data.py", line 125, in <module>     res = conn.execute(sql)   file "/usr/local/lib/python2.6/dist-packages/sqlalchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1405, in execute     params)   file "/usr/local/lib/python2.6/dist-packages/sqlalchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1582, in _execute_text     statement, parameters   file "/usr/local/lib/python2.6/dist-packages/sqlalchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1646, in _execute_context     context)   file "/usr/local/lib/python2.6/dist-packages/sqlalchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1639, in _execute_context     context)   file "/usr/local/lib/python2.6/dist-packages/sqlalchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/default.py", line 330, in do_execute     cursor.execute(statement, parameters) internalerror: (internalerror) current transaction aborted, commands ignored until end of transaction block ...

does know why getting cryptic error - , how resolve it?

can activate log query on postgresql ? (min_duration set 0 in postgresql.conf restart).

then @ postgresql logs debug it.


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