SQLAlchemy和flask(sqlalchemy.exc.OperationalError:)

问题描述 投票:0回答:1

我收到此消息:

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: user
[SQL: INSERT INTO user (username, email, password) VALUES (?, ?, ?)]
[parameters: ('test', '[email protected]', 'password')]
(Background on this error at: http://sqlalche.me/e/e3q8)

当我尝试:db.session.commit()

我正在学习教程,并尝试对代码进行个性化设置,但效果不佳。

我为得到该错误所做的事情是:

>>> from lagerut import db
>>> db.create_all()
>>> from models import User
>>> user_1 = User(username='test', email='[email protected]', password='password')
>>> db.session.add(user_1)
>>> db.session.commit()

这里是lagerut.py:

from datetime import datetime
from flask import Flask, render_template, url_for, flash, redirect
from flask_sqlalchemy import SQLAlchemy
from form import RegistrationForm, LoginForm


app = Flask(__name__)
app.config['SECRET_KEY'] = '2a1de6eea4126191912d6e702c6aa8f9'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///lagerut.db'
db = SQLAlchemy(app)

@app.route('/')
@app.route('/home')
def home():
    return render_template ('home.html')


@app.route('/how-it-works')
def howitworks():
    return render_template ('how-it-works.html', title='How it works')


@app.route('/lager-out')
def lagerout():
    return render_template ('lager-out.html', title='Lager out')


@app.route('/lager-in')
def lagerin():
    return render_template ('lager-in.html', title='Lager in')

@app.route("/register", methods=['GET', 'POST'])
def register():
    form = RegistrationForm()
    if form.validate_on_submit():
        flash(f'Account created for {form.username.data}!', 'success')
        return redirect(url_for('home'))
    return render_template('register.html', title='Register', form=form)


@app.route("/login", methods=['GET', 'POST'])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        if form.email.data == '[email protected]' and form.password.data == 'password':
            flash('You have been logged in!', 'success')
            return redirect(url_for('home'))
        else:
            flash('Login Unsuccessful. Please check username and password', 'danger')
    return render_template('login.html', title='Login', form=form)





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

这里是models.py:


from datetime import datetime
from lagerut import db

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(20), unique=True, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)
    password = db.Column(db.String(60), nullable=False)

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

class Items(db.Model):
    item_number = db.Column(db.Integer, primary_key=True)
    description = db.Column(db.String(200), nullable=False)
    date_posted = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
    department = db.Column(db.String(100), nullable=False)
    content = db.Column(db.Text, nullable=False)

    def __repr__(self):
        return f"Items('{self.product}', '{self.date_posted}', '{self.content}', '{self.department}', '{self.content}')"

我应该再次尝试编写代码吗?我只是想学习如何为我的工作构建一个小应用程序。

python database flask sqlalchemy
1个回答
0
投票

这是因为在创建数据库时没有创建应用上下文,因为您是通过python shell执行此操作的,因此需要添加以下行

with app.app_context():

在此https://flask.palletsprojects.com/en/1.0.x/appcontext/了解更多信息>

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