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Essential SQLAlchemy: Chapter 8 (fix)

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Pavel Vavilin
2026-09-25 15:43:45 +05:00
parent 9f12aed661
commit d0c69163c5
1 changed files with 7 additions and 5 deletions
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Essential-SQLAlchemy-2nd.org
+7 -5
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@@ -5723,7 +5723,7 @@ sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled
def trans_ship_it(order_id: int) -> None: def trans_ship_it(order_id: int) -> None:
try: try:
with session.nested_begin(): with session.begin_nested():
order = session.get(Order, order_id) order = session.get(Order, order_id)
if order is None: if order is None:
raise ValueError(f"Order {order_id} not found") raise ValueError(f"Order {order_id} not found")
@@ -5740,7 +5740,7 @@ sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled
print(session.execute(stmt).all()) print(session.execute(stmt).all())
#+END_SRC #+END_SRC
#+RESULTS[a47407ad9a3195076bce967c19c880f1bb5d3ce9]: #+RESULTS[6b80bda7ad50095f9d5b584ed9e5f8e557b0dfd5]:
#+begin_example #+begin_example
shipped order ID: 1 shipped order ID: 1
[('chocolate chip', 3), ('dark chocolate chip', 1)] [('chocolate chip', 3), ('dark chocolate chip', 1)]
@@ -5761,10 +5761,10 @@ sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled
The above exception was the direct cause of the following exception: The above exception was the direct cause of the following exception:
Traceback (most recent call last): Traceback (most recent call last):
File "/tmp/babel-0NE78C/python-VGomxl", line 201, in <module> File "/tmp/babel-0NE78C/python-uG2oyE", line 201, in <module>
ship_it(2) ship_it(2)
~~~~~~~^^^ ~~~~~~~^^^
File "/tmp/babel-0NE78C/python-VGomxl", line 191, in ship_it File "/tmp/babel-0NE78C/python-uG2oyE", line 191, in ship_it
session.commit() session.commit()
~~~~~~~~~~~~~~^^ ~~~~~~~~~~~~~~^^
File "/home/octopus/study/Python/sqlalchemy-study/.venv/lib/python3.14/site-packages/sqlalchemy/orm/session.py", line 2035, in commit File "/home/octopus/study/Python/sqlalchemy-study/.venv/lib/python3.14/site-packages/sqlalchemy/orm/session.py", line 2035, in commit
@@ -5872,7 +5872,7 @@ sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled
(Background on this error at: https://sqlalche.me/e/20/gkpj) (Background on this error at: https://sqlalche.me/e/20/gkpj)
ERROR:root:нужен rollback ERROR:root:нужен rollback
Traceback (most recent call last): Traceback (most recent call last):
File "/tmp/babel-0NE78C/python-VGomxl", line 206, in <module> File "/tmp/babel-0NE78C/python-uG2oyE", line 206, in <module>
print(session.execute(stmt).all()) print(session.execute(stmt).all())
~~~~~~~~~~~~~~~^^^^^^ ~~~~~~~~~~~~~~~^^^^^^
File "/home/octopus/study/Python/sqlalchemy-study/.venv/lib/python3.14/site-packages/sqlalchemy/orm/session.py", line 2373, in execute File "/home/octopus/study/Python/sqlalchemy-study/.venv/lib/python3.14/site-packages/sqlalchemy/orm/session.py", line 2373, in execute
@@ -5903,4 +5903,6 @@ sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled
[parameters: (-8, 2)] [parameters: (-8, 2)]
(Background on this error at: https://sqlalche.me/e/20/gkpj) (Background on this error at: https://sqlalche.me/e/20/7s2a) (Background on this error at: https://sqlalche.me/e/20/gkpj) (Background on this error at: https://sqlalche.me/e/20/7s2a)
[('chocolate chip', 3), ('dark chocolate chip', 1)] [('chocolate chip', 3), ('dark chocolate chip', 1)]
ERROR:root:CHECK constraint failed: quantity_positive
[('chocolate chip', 3), ('dark chocolate chip', 1)]
#+end_example #+end_example