db.create_all() 未将特定列添加到数据库中

Question

我正在尝试使用 Flask sqlalchemy 将 Product 表添加到数据库中。它添加了除 userBudget 之外的所有列 有谁知道为什么？ 在cmd上，我做

from app import db
db.create_all()

然后我进入 sqlite3 并检查 .schema，但只有 userBudget 列丢失了

sqlite> .schema
CREATE TABLE user (
        id INTEGER NOT NULL,
        username VARCHAR(15),
        email VARCHAR(50),
        password VARCHAR(80),
        PRIMARY KEY (id),
        UNIQUE (username),
        UNIQUE (email)
);
CREATE TABLE product (
        "userId" INTEGER NOT NULL,
        "productURL" VARCHAR NOT NULL,
        "currentPrice" INTEGER,
        PRIMARY KEY ("userId"),
        FOREIGN KEY("userId") REFERENCES user (id)
);

import requests
from flask import Flask, render_template, redirect, url_for, request
from flask_bootstrap import Bootstrap
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user

# Instantiation
app = Flask(__name__) 

app.config['SECRET_KEY'] = 'secret'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'  # location of database
SQLALCHEMY_TRACK_MODIFICATIONS = False # no sqlalchemy warnings in console
bootstrap = Bootstrap(app) # allows use of flask-bootstrap
db = SQLAlchemy(app) # database

# Initialization
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'

# Database Tables
class User(UserMixin, db.Model): # UserMixin provides default implementations for the methods flask-login expects users to have
    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))

class Product(db.Model):
    userId = db.Column(db.Integer, db.ForeignKey(User.id), primary_key=True)
    productURL = db.Column(db.String(), nullable=False)
    currentPrice = db.Column(db.Integer)
    userBudget = db.Column(db.Integer, nullable=False)

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

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

Answer 1

如果您仍处于开发阶段，请执行

db.drop_all()

，然后执行

db.create_all()

。

您应该跟踪您的数据库更改，例如https://github.com/miguelgrinberg/Flask-Migrate

Answer 2

正如有人建议的 db.drop_all()，然后运行 db.create_all()，重新启动 为我工作