db.create_all() 报错上下文

This typically means that you attempted to use functionality that needed the current application. To solve this, set up an application context with app.app_context(). See the documentation for more information.

```python

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import os

app = Flask(__name__)


class BaseConfig():
    DEBUG = True
    # 获取项目目录
    APP_PATH = os.path.dirname(__file__)
    # # sqlite数据库url
    SQLALCHEMY_DATABASE_URI = f'sqlite:///{APP_PATH}/database'
    SQLALCHEMY_TRACK_MODIFICATIONS = True  # 跟踪数据库修改
    SQLALCHEMY_ECHO = True  # 对调试很有用


app.config.from_object(BaseConfig)




db = SQLAlchemy(app)

class User(db.Model):  # 模型类继承db.Model
    uid = db.Column(db.INTEGER, primary_key=True)
    username = db.Column(db.String(50))
    password = db.Column(db.String(40), index=True)



with app.app_context():
    db.drop_all()
    db.create_all()  # 创建所有表

```

with app.app_context():

db.drop_all() db.create_all() # 创建所有表

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