Question

我正在尝试使用PythonAnywhere将一个小型flask应用程序联机。我先将SqlAlchemy与MySql一起使用，但是每当我尝试通过我的应用程序查询内容时，标题中都会出现typeError。然后我转而使用Sqlite3，以为它可以解决问题，但仍然存在。

在尝试将其移植到PythonAnywhere之前，我使用了Sqlite并将其托管在自己的计算机上。我首先使用SqlAlchemy和MySql，因为它是推荐的。我的查询没有问题，因为当我通过控制台执行查询时，它们始终有效。

这是我的代码：

def register():

    if request.method == "POST":
        [unnecessary code snipped out]
        # This is a dummy query, I cut the original out because it was too  
        # long and unnecessary, but both produce the same error
        result = db.execute("""select * from users""")
        if not result:
            return apology("Username already exists.")

        # remember which user has logged in
        session["user_id"] = result

        # redirect user to home page
        return redirect(url_for("index"))

    elif request.method == "GET":
        return render_template("register.html")

如果用户成功注册，该函数应该将用户重定向到索引，并且查询应该可以工作，但我却收到此错误和回溯：

Traceback (most recent call last):
  File "/home/8BitRebellion/.virtualenvs/my-virtualenv/lib/python3.6/site-packages/flask/app.py", line 2311, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/8BitRebellion/.virtualenvs/my-virtualenv/lib/python3.6/site-packages/flask/app.py", line 1835, in full_dispatch_request
    return self.finalize_request(rv)
  File "/home/8BitRebellion/.virtualenvs/my-virtualenv/lib/python3.6/site-packages/flask/app.py", line 1852, in finalize_request
    response = self.process_response(response)
  File "/home/8BitRebellion/.virtualenvs/my-virtualenv/lib/python3.6/site-packages/flask/app.py", line 2133, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/home/8BitRebellion/.virtualenvs/my-virtualenv/lib/python3.6/site-packages/flask_session/sessions.py", line 355, in save_session
    total_seconds(app.permanent_session_lifetime))
  File "/home/8BitRebellion/.virtualenvs/my-virtualenv/lib/python3.6/site-packages/werkzeug/contrib/cache.py", line 839, in set
    pickle.dump(value, f, pickle.HIGHEST_PROTOCOL)
TypeError: can't pickle sqlite3.Cursor objects

我不明白为什么会触发此错误，并且当我进行搜索时也会遇到类似的错误，但是没有一个与此相关。预先感谢

编辑：已解决多亏@roganjosh，我才意识到问题出在我执行查询的方式上，而不是我最初想到的那样处理查询的方式。

尝试在PythonAnywhere上使用Flask查询sqlite数据库时出现“ TypeError：无法腌制sqlite3.Cursor对象”

0 个答案: