Flask 新手查询 sqlite3.OperationalError

Question

我是新手，试图通过创建一个简单的待办事项应用程序来学习 Flask，因为它位于 python 代码下方我很想执行，但是当我运行我得到 sqlite3.OperationalError: no such column: todo.task 我不确定我在这里遗漏了什么，请协助

import os
from flask import Flask, render_template, request, redirect
from flask_sqlalchemy import SQLAlchemy


project_dir = os.path.dirname(os.path.abspath(__file__))
# sqlite: // / prefix to tell SQLAlchemy which database engine we're using.
database_file = "sqlite:///{}".format(
    os.path.join(project_dir, "mydatabase.db"))

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = database_file
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False

db = SQLAlchemy(app)


class Todo(db.Model):
    
    id = db.Column(db.Integer, primary_key=True)
    task = db.Column(db.String(100))


@app.route('/', methods=["GET", "POST"])
def samplehome():
    todo_list = Todo.query.all()
    print(todo_list)

    
    return render_template("index.html", todo_list=todo_list)

    # if request.form:
    #     print(request.form)
    #     submitted = Todo(id=request.form.get("id"),task=request.form.get("task"))
    #     try:
    #         db.session.add(submitted)
    #         db.session.commit()
    #     except Exception as e:
    #         print(e)
    #         db.session.rollback()
    



if __name__ == "__main__":
    db.create_all()
    app.run(host='0.0.0.0', debug=True)

Answer 1

我认为问题是您没有在 db.create_all() 函数之后提交更改。你可以这样试试

if __name__ == "__main__":
    db.create_all()
    db.session.commit()
    app.run(host='0.0.0.0', debug=True)

有个类似的问题：SQLAlchemy create_all() does not create tables

除了你的问题，我不直接建议 return 你的数据库 class。您可以查看 MVC 设计模式。

Flask 新手查询 sqlite3.OperationalError

Flask Newbie Query sqlite3.OperationalError

python

flask