Получение ошибки при использовании метода query.all () в sqlalchemy - PullRequest
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Получение ошибки при использовании метода query.all () в sqlalchemy

0 голосов
/ 05 октября 2019

Я пытался отобразить все записи, которые я сделал в моем файле test.db, но в среде IDE возникла следующая ошибка: 

Usr.query.all()

Трассировка (последний последний вызов): 

**(sqlite3.ProgrammingError) **SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 16064 and this is thread id 9372.**
[SQL: SELECT usr.id AS usr_id, usr.username AS usr_username, usr.email AS usr_email, usr.profile_img AS usr_profile_img, usr.password AS usr_password 
FROM usr]
[parameters: [{}]]**

(Справочная информация об этой ошибке: http://sqlalche.me/e/f405)

Кто-нибудь знает, что это значит?

Ниже приведен мой источник app.py 

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
db = SQLAlchemy(app)

class Usr(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.VARCHAR, unique=True, nullable=False)
    email = db.Column(db.VARCHAR(64), unique=True, nullable=False)
    profile_img = db.Column(db.VARCHAR(32), nullable=False, default='default.jpg')
    password = db.Column(db.VARCHAR(40), nullable=False)
    tweets = db.relationship('Tweet', backref='author', lazy=True)

    def __repr__(self):
        return f"Usr('{self.username}', '{self.email}', '{self.profile_img}')"

class Tweet(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    title = db.Column(db.Text(64), )
    content = db.Column(db.NVARCHAR(280), nullable = False)
    date_modified = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
    user_id = db.Column(db.Integer, db.ForeignKey('usr.id'), nullable=False)

    def __repr__(self):
        return f"Tweet('{self.title}', '{self.date_modified}')"@app.route('/')
@app.route('/home')
def home():
    return render_template('home.html', blog_db=blogs, headlines=news)

@app.route('/register', methods=['GET', 'POST'])
def registration():
    form = Register_Form()
    if form.validate_on_submit():
        flash(f'Welcome {form.username.data}, your account has been created!', 'success')
        return redirect(url_for('home'))
    return render_template('signup.html', title='Sign Up', form=form)

@app.route('/login', methods=['GET', 'POST'])
def usr_login():
    form = Login_Form()
    if form.validate_on_submit():
        if form.username.data == 'analfister' and form.password.data == 'sex-t9':
            flash('Successfully logged in', 'success')
            return redirect(url_for('home'))
        else:
            flash('You aight man? cause I found zero records of your credentials', 'danger')
    return render_template('login.html', title='Login', form=form)

@app.route('/about')
def bleep():
    return render_template('about.html', title='About')

if __name__ == '__main__':
    app.run(debug=True)

Это дБ-запросы, которые я вставил прямо в консоль python с соответствующими выводами: 

from app import db
F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\flask_sqlalchemy\__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
db.create_all()
from app import Usr, Tweet
user0=Usr(username='test0', email='test0@pychat.app', password='TesT@0')
db.session.add(user0)
user1=Usr(username='test1', email='test1@pychat.app', password='TesT@1')
db.session.add(user1)
db.session.commit()
Usr.query.all()
Traceback (most recent call last):
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1179, in _execute_context
    context = constructor(dialect, self, conn, *args)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\default.py", line 688, in _init_compiled
    self.cursor = self.create_cursor()
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1042, in create_cursor
    return self._dbapi_connection.cursor()
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\pool\base.py", line 965, in cursor
    return self.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 16064 and this is thread id 9372.
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\orm\query.py", line 3178, in all
    return list(self)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\orm\query.py", line 3334, in __iter__
    return self._execute_and_instances(context)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\orm\query.py", line 3359, in _execute_and_instances
    result = conn.execute(querycontext.statement, self._params)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\base.py", line 988, in execute
    return meth(self, multiparams, params)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\sql\elements.py", line 287, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1107, in _execute_clauseelement
    distilled_params,
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1182, in _execute_context
    e, util.text_type(statement), parameters, None, None
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1473, in _handle_dbapi_exception
    util.raise_from_cause(sqlalchemy_exception, exc_info)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\util\compat.py", line 398, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\util\compat.py", line 152, in reraise
    raise value.with_traceback(tb)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1179, in _execute_context
    context = constructor(dialect, self, conn, *args)
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\default.py", line 688, in _init_compiled
    self.cursor = self.create_cursor()
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\engine\default.py", line 1042, in create_cursor
    return self._dbapi_connection.cursor()
  File "F:\PycharmProjects\BulletinBoard\venv\lib\site-packages\sqlalchemy\pool\base.py", line 965, in cursor
    return self.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 16064 and this is thread id 9372.
[SQL: SELECT usr.id AS usr_id, usr.username AS usr_username, usr.email AS usr_email, usr.profile_img AS usr_profile_img, usr.password AS usr_password 
FROM usr]
[parameters: [{}]]
(Background on this error at: http://sqlalche.me/e/f405)
...