Python SQLAlchemy.exc.OperationalError:(sqlite3.OperationalError)没有这样的表:user
run.py文件:Python SQLAlchemy.exc.OperationalError:(sqlite3.OperationalError)没有这样的表:user,python,sqlite,flask,sqlalchemy,runtime-error,Python,Sqlite,Flask,Sqlalchemy,Runtime Error,run.py文件: from flaskblog import app, db if __name__ == '__main__': db.create_all() app.run(debug=True) models.py文件: from flaskblog import db from datetime import datetime class User(db.Model): __tablename__ = 'user' id = db.Colu
from flaskblog import app, db
if __name__ == '__main__':
db.create_all()
app.run(debug=True)
models.py文件:
from flaskblog import db
from datetime import datetime
class User(db.Model):
__tablename__ = 'user'
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(20), nullable=False)
email = db.Column(db.String(120), unique=True, nullable=False)
img_file = db.Column(db.String(20), nullable=False, default='default.jpeg')
password = db.Column(db.String(60), nullable=False)
posts = db.relationship('Post', backref='author', lazy=True)
def __repr__(self):
return f"User('{ self.username }', '{ self.email }', '{ self.img_file }')"
class Post(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(100), nullable=False)
date_posted = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
content = db.Column(db.Text, nullable=False)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
def __repr__(self):
return f"User { self.title }, { self.date_posted })"
init.py文件:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_bcrypt import Bcrypt
app = Flask(__name__)
app.config['SECRET_KEY'] = 'hard to guess'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'
app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN'] = True
db = SQLAlchemy(app)
bcrypt = Bcrypt(app)
from flaskblog import routes
在使用db.create_all()
运行应用程序之前,我曾尝试使用终端创建表,但仍然无法运行。
将引发以下错误:
SQLAlchemy.exc.OperationalError : (sqlite3.OperationalError) no such table: user
如果有人能解决这个问题,我将不胜感激。
谢谢。
#从flaskblog导入数据库创建表后,您是否可以使用sqlite3
命令行客户端手动打开site.db
文件并验证它是否确实存在?尝试将db.create\u all()
放在模型架构之后。您必须使用与SQLAlchemy
相同的实例,因此在您的模型定义中,您必须导入这些实例如果您使用flask run
启动应用程序,则不会执行if
位于db.create()
底部的块。
#from flaskblog import db <- this import is wrong!
from my_project_name import db # the instancfe of SQLAlchemy that you use in your app
from datetime import datetime
class User(db.Model):
__tablename__ = 'user'
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(20), nullable=False)
email = db.Column(db.String(120), unique=True, nullable=False)
img_file = db.Column(db.String(20), nullable=False, default='default.jpeg')
password = db.Column(db.String(60), nullable=False)
posts = db.relationship('Post', backref='author', lazy=True)
def __repr__(self):
return f"User('{ self.username }', '{ self.email }', '{ self.img_file }')"
class Post(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(100), nullable=False)
date_posted = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
content = db.Column(db.Text, nullable=False)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
def __repr__(self):
return f"User { self.title }, { self.date_posted })"