Flask 和 Python sqlite3 集成中的错误

Question

好的！ 所以，我正在为我最近开发的一个网站创建一个简单登录程序！我正在使用 Flask 来提供我的 HTML 页面模板.... 我正在使用 sqlite3 Python 模块以便于使用模块...

所以，我为我的主网​​站创建了一个 App Route 用于登录页面。您可以查看以下代码：

def login():
    msg = ''
    
    if request.method == 'POST' and 'username' in request.form and 'password' in request.form:
        # Create variables for easy access
        username = request.form['username']
        password = request.form['password']

        #Connection Est.
        connection = sqlite3.connect("Users.db")

        #cursor
        USer_crsr = connection.cursor()

        user_cm = """SELECT username, password FROM accounts"""

        USer_crsr.execute(user_cm)
        USer_result = USer_crsr.fetchall()

        if username and password in USer_result:
            # Create session data, we can access this data in other routes
              session['loggedin'] = True
              session['id'] = USer_result['id']
              session['username'] = USer_result['username']
              # Redirect to home page
              return 'Logged in successfully!'
        else:
            # Account doesnt exist or username/password incorrect
            msg = 'Incorrect username/password!'
    return render_template("login.html", msg=msg)

我运行我的程序，我没有收到任何错误！我打开我的登录页面，页面打开时没有出现错误！这是页面外观： Login Page

但是当我提交表单时，我收到一个错误（不是在控制台中，而是在网页本身中）： 405 - Method Not allowed!

另外，这是我用来创建数据库的数据库文件的代码：

#Connection to FILE
User_DATA_connection = sqlite3.connect('Users.db')

crsr = User_DATA_connection.cursor()

#command here
command = """CREATE TABLE IF NOT EXISTS 'accounts' (
  'id' int(11) NOT NULL,
  'username' varchar(50) NOT NULL,
  'password' varchar(250) NOT NULL,
  'email' varchar(100) NOT NULL,
  PRIMARY KEY ('id')
) 
"""

#execute
crsr.execute(command)

comm = """INSERT INTO accounts VALUES (1, 'test', 'test', 'test@gmail.com');"""

crsr.execute(comm)

User_DATA_connection.commit()

#close data
User_DATA_connection.close()

Answer 1

当你装饰你的 Flask 路由的函数时，你需要允许 POST 方法。 示例：

@app.route('/login', methods=["GET", "POST"])
def login():
    if request.method == "GET":
        # Render your page
    if request.method == "POST":
        # Process the data you POST-ed from your frontend (insert them into the DB, etc.)