sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) 没有这样的表：用户

Question

我一直收到此错误 sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: user 但我不知道为什么，因为我通过命令 sqlite3 在好目录中创建了我的数据库database.db 和 .tables 。我试过 db.create_all() 但如果它在 db 声明之前它当然不起作用但是如果我把它放在它之后它不会改变任何东西

我还有一个问题，那就是 db."" 总是被标记为错误。我尝试安装 pylint-flask 并将其加载到设置中。它工作了大约 5 分钟，然后错误又回来了（'SQLAlchemy' 的实例没有'Column' memberpylint(no-member)）

from flask import Flask, render_template, redirect, url_for
from flask_bootstrap import Bootstrap
from flask_wtf import FlaskForm 
from wtforms import StringField, PasswordField, BooleanField
from wtforms.validators import InputRequired, Email, Length
from flask_sqlalchemy  import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user


app = Flask(__name__)
app.config['SECRET_KEY'] = 'Thisissupposedtobesecret!'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///sqlite-tools-win32-x86-3290000/database.db'
bootstrap = Bootstrap(app)
db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(15), unique=True)
    email = db.Column(db.String(50), unique=True)
    password = db.Column(db.String(80))

@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

class LoginForm(FlaskForm):
    username = StringField('username', validators=[InputRequired(), Length(min=4, max=15)])
    password = PasswordField('password', validators=[InputRequired(), Length(min=8, max=80)])
    remember = BooleanField('remember me')

class RegisterForm(FlaskForm):
    email = StringField('email', validators=[InputRequired(), Email(message='Invalid email'), Length(max=50)])
    username = StringField('username', validators=[InputRequired(), Length(min=4, max=15)])
    password = PasswordField('password', validators=[InputRequired(), Length(min=8, max=80)])

Answer 1

定义模型后，您需要调用create_all() 和commit() 来更新对数据库的更改。

例如..

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(15), unique=True)
    email = db.Column(db.String(50), unique=True)
    password = db.Column(db.String(80))

db.create_all()
db.session.commit()