Python 的 SQLite URL 无效 (SQLAlchemy)

问题描述

我正在尝试使用教程制作一个简单的论坛网站，我正在为该网站制作一个数据库。但是，每当我尝试使用 db.create_all() 进行创建时，总是会出现 Invalid sqlite URL 错误。我是这方面的绝对初学者，所以我真的需要一些帮助。 :(我认为这主要是由于这段代码

app.config['sqlALCHEMY_DATABASE_URI'] = 'sqlite:///slisff.db'

尝试添加斜杠，粘贴我的项目/venv 的实际地址，什么也没有。 cmd 和 pycharm 都试过了，还是不成功。我使用的是 Windows 笔记本电脑和 PyCharm。

from flask import Flask,render_template,request,redirect,url_for,session,flash
from forms import RegistrationForm,LoginForm
import sqlite3
from flask_sqlalchemy import sqlAlchemy
from datetime import  datetime
# from flask_login import LoginManager
#
# login_manager = LoginManager()


app = Flask(__name__)
#Protect Against Cookie Modification
app.config['SECRET_KEY'] = 'f9a2fd8f07fae783cf24ae35997a2a7c'
app.config['sqlALCHEMY_DATABASE_URI'] = 'sqlite:///slisff.db'
db = sqlAlchemy(app)

#Unique ID for each user/entry in the user database
#User Info Class
class User(db.Model):
    id = db.Column(db.Integer,primary_key=True)
    username = db.Column(db.String(25),unique=True,nullable=False)
    email = db.Column(db.String(50),nullable=False)
    prof_pic = db.Column(db.String(20),nullable=False,default='default.jpg')
    password = db.Column(db.String(60),nullable=False)
    #shows relationship of posts made to a single author that wrote them,backref is adding pseudo column to post model
    posts = db.relationship('Post',backref='author',lazy=True)
    #How our user object (info) will be printed
    def __repr__(self):
        return f"User('{self.username}','{self.email}','{self.prof_pic}')"

#Class for posts made in the Freedom Forums
class Post(db.Model):
    id = db.Column(db.Integer,primary_key=True)
    title = db.Column(db.String(90),nullable=False)
    date_posted = db.Column(db.DateTime,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"Post('{self.title}','{self.date_posted}')"

这是我收到的错误消息。

>>> db.create_all()
Traceback (most recent call last):
  File "<stdin>",line 1,in <module>
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\flask_sqlalchemy\__init__.py",line 109
4,in create_all
    self._execute_for_all_tables(app,bind,'create_all')
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\flask_sqlalchemy\__init__.py",line 108
6,in _execute_for_all_tables
    op(bind=self.get_engine(app,bind),**extra)
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\flask_sqlalchemy\__init__.py",line 101
7,in get_engine
    return connector.get_engine()
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\flask_sqlalchemy\__init__.py",line 594,in get_engine
    self._engine = rv = self._sa.create_engine(sa_url,options)
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\flask_sqlalchemy\__init__.py",line 102
7,in create_engine
    return sqlalchemy.create_engine(sa_url,**engine_opts)
  File "<string>",line 2,in create_engine
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\sqlalchemy\util\deprecations.py",line
298,in warned
    return fn(*args,**kwargs)
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\sqlalchemy\engine\create.py",line 564,in create_engine
    (cargs,cparams) = dialect.create_connect_args(u)
  File "C:\Users\Francois\Desktop\LIS 161\SLISForums\venv\lib\site-packages\sqlalchemy\dialects\sqlite\pysqlite.py",line 545,in create_connect_args
    raise exc.ArgumentError(
sqlalchemy.exc.ArgumentError: Invalid sqlite URL: sqlite://site.db
Valid sqlite URL forms are:
 sqlite:///:memory: (or,sqlite://)
 sqlite:///relative/path/to/file.db
 sqlite:////absolute/path/to/file.db

解决方法

您是从 Python 文件中导入 db 吗？

您可以在此处访问我的烧瓶项目https://github.com/jakbin/flask