我正在嘗試使用模型（用戶和專案）為燒瓶市場網站創建資料庫。我正在關注本教程并且我正在關注它：教程鏈接，本節在 2:14:00 到 2:25:00。
當我進入我的 python 終端并執行以下命令時：
from market import db
from market.models import User,Item
u1 = User(username='Hay', password_hash = '123', email_address='[email protected]')
db.session.add(u1)
db.session.commit()
User.query.all()
i1 = Item(name='Iphone X', description='New iphone', barcode='123456789101', price=760)
db.session.add(i1)
db.session.commit()
i2 = Item(name='Macbook', description='New macbook', barcode='123456789102', price=1000)
db.session.add(i2)
db.session.commit()
當我第二次輸入 db.session.commit() 時，我收到此錯誤：
Traceback (most recent call last):
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1702, in _execute_context
context = constructor(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1013, in _init_compiled
self.cursor = self.create_cursor()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1361, in create_cursor
return self.create_default_cursor()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1364, in create_default_cursor
return self._dbapi_connection.cursor()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\pool\base.py", line 1083, in cursor
return self.dbapi_connection.cursor(*args, **kwargs)
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 24304 and this is thread id 12744.
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3448, in _flush
flush_context.execute()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 456, in execute
rec.execute(self)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 630, in execute
util.preloaded.orm_persistence.save_obj(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 244, in save_obj
_emit_insert_statements(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 1221, in _emit_insert_statements
result = connection._execute_20(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1614, in _execute_20
return meth(self, args_10style, kwargs_10style, execution_options)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\sql\elements.py", line 325, in _execute_on_connection
return connection._execute_clauseelement(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1481, in _execute_clauseelement
ret = self._execute_context(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1708, in _execute_context
self._handle_dbapi_exception(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2026, in _handle_dbapi_exception
util.raise_(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1702, in _execute_context
context = constructor(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1013, in _init_compiled
self.cursor = self.create_cursor()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1361, in create_cursor
return self.create_default_cursor()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1364, in create_default_cursor
return self._dbapi_connection.cursor()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\pool\base.py", line 1083, in cursor
return self.dbapi_connection.cursor(*args, **kwargs)
sqlalchemy.exc.ProgrammingError: (sqlite3.ProgrammingError) SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 24304 and this is thread id 12744.
[SQL: INSERT INTO item (name, price, barcode, description, owner) VALUES (?, ?, ?, ?, ?)]
[parameters: [{'barcode': '123456789102', 'price': 760, 'description': 'New laptop', 'name': 'Laptop', 'owner': None}]]
(Background on this error at: https://sqlalche.me/e/14/f405)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 966, in _rollback_impl
self.engine.dialect.do_rollback(self.connection)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 682, in do_rollback
dbapi_connection.rollback()
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 24304 and this is thread id 12744.
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "<string>", line 2, in commit
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 1431, in commit
self._transaction.commit(_to_root=self.future)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 829, in commit
self._prepare_impl()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 808, in _prepare_impl
self.session.flush()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3348, in flush
self._flush(objects)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3488, in _flush
transaction.rollback(_capture_exception=True)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\util\langhelpers.py", line 84, in __exit__
compat.raise_(value, with_traceback=traceback)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3488, in _flush
transaction.rollback(_capture_exception=True)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 900, in rollback
util.raise_(rollback_err[1], with_traceback=rollback_err[2])
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\orm\session.py", line 865, in rollback
t[1].rollback()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2340, in rollback
self._do_rollback()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2544, in _do_rollback
self._close_impl(try_deactivate=True)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2527, in _close_impl
self._connection_rollback_impl()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2519, in _connection_rollback_impl
self.connection._rollback_impl()
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 968, in _rollback_impl
self._handle_dbapi_exception(e, None, None, None, None)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2026, in _handle_dbapi_exception
util.raise_(
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
raise exception
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\base.py", line 966, in _rollback_impl
self.engine.dialect.do_rollback(self.connection)
File "C:\Users\simer\PycharmProjects\MarketWebsite_Flask\venv\lib\site-packages\sqlalchemy\engine\default.py", line 682, in do_rollback
dbapi_connection.rollback()
sqlalchemy.exc.ProgrammingError: (sqlite3.ProgrammingError) SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 24304 and this is thread id 12744.
(Background on this error at: https://sqlalche.me/e/14/f405)
我不知道為什么以及如何解決這個問題，有誰知道為什么會發生這種情況以及我如何解決它？
這是我的模型的代碼：
from market import db
class User(db.Model):
id = db.Column(db.Integer(), primary_key=True)
username = db.Column(db.String(length=30), nullable=False, unique=True)
email_address = db.Column(db.String(length=50), nullable=False, unique=True)
password_hash = db.Column(db.String(length=60), nullable=False)
budget = db.Column(db.Integer(), nullable=False, default=1000) # Users have 1000 points to spend at the start
items = db.relationship('Item', backref='owned_user', lazy=True)
class Item(db.Model):
id = db.Column(db.Integer(), primary_key=True)
name = db.Column(db.String(length=30), nullable=False, unique=True)
price = db.Column(db.Integer(), nullable=False)
barcode = db.Column(db.String(length=12), nullable=False, unique=True)
description = db.Column(db.String(length=1000), nullable=False)
owner = db.Column(db.Integer(), db.ForeignKey('user.id'))
def __repr__(self):
return f'Item {self.name}'
uj5u.com熱心網友回復：
我正在 PyCharm repl 中執行所有這些資料庫命令。我相信它與記憶體有關，這就是為什么它不能在 Pycharm 的 python 控制臺中作業。它在命令提示符終端和 python 檔案中作業正常。
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