Question

我使用flask框架在python中编写代码来构建应用程序，但在重定向到下一页时显示内部服务器错误。登录页面包含将重定向到下一个路径 page.so如何解决该问题。这是app.py文件的代码。

from flask import Flask, request, render_template

from flaskext.mysql import  MySQL

app = Flask(__name__)

mysql = MySQL()
app = Flask(__name__)
app.config['MYSQL_DATABASE_USER'] = 'root'
app.config['MYSQL_DATABASE_PASSWORD'] = ''
app.config['MYSQL_DATABASE_DB'] = 'invertoryDb'
app.config['MYSQL_DATABASE_HOST'] = 'localhost'
MYSQL_DATABASE_SOCKET = '/tmp/mysql.sock'
mysql.init_app(app)



@app.route('/')
def my_form():
return render_template('loginPage.html')

@app.route('/login', methods=['POST'])
def Authenticate():

username = request.form['username']
password = request.form['password']
cursor = mysql.connect().cursor()
cursor.execute("SELECT * FROM user WHERE username='"+username+"' and password='"+password+"'")
data = cursor.fetchone()
if data is None:
    return "usernme and password is wrong"
else:
    return "logged in succesfully"

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

这是html文件的代码。

<!DOCTYPE html>
<html>
<head>
<title>Login page</title>
<style type="text/css">
    * {
    box-sizing: border-box;
    }

    *:focus {
    outline: none;
    }
    body {
    font-family: Arial;
    background-color: #3498DB;
    padding: 50px;
    }
    .login {
    margin: 20px auto;
    width: 300px;
    }
    .login-screen {
    background-color: #FFF;
    padding: 20px;
    border-radius: 5px
    }

    .app-title {
    text-align: center;
    color: #777;
    }

    .login-form {
    text-align: center;
    }
    .control-group {
    margin-bottom: 10px;
    }

    input {
    text-align: center;
    background-color: #ECF0F1;
    border: 2px solid transparent;
    border-radius: 3px;
    font-size: 16px;
    font-weight: 200;
    padding: 10px 0;
    width: 250px;
    transition: border .5s;
    }

    input:focus {
    border: 2px solid #3498DB;
    box-shadow: none;
    }

    .btn {
    border: 2px solid transparent;
    background: #3498DB;
    color: #ffffff;
    font-size: 16px;
    line-height: 25px;
    padding: 10px 0;
    text-decoration: none;
    text-shadow: none;
    border-radius: 3px;
    box-shadow: none;
    transition: 0.25s;
    display: block;
    width: 250px;
    margin: 0 auto;
    }

    .btn:hover {
    background-color: #2980B9;
    }

    .login-link {
    font-size: 12px;
    color: #444;
    display: block;
    margin-top: 12px;
    }
</style>
</head>
<body>
<form action="/login" method="POST">
    <div class="login">
        <div class="login-screen">
            <div class="app-title">
                <h1>Login</h1>
            </div>
            <div class="login-form">
            <div class="control-group">
                            <input type="text" class="login-field" value="" placeholder="username" 
name="username">
            <label class="login-field-icon fui-user" for="login-name"></label></div>
            <div class="control-group">
                            <input type="password" class="login-field" value="" 
 placeholder="password" name="password">
            <label class="login-field-icon fui-lock" for="login-pass"></label></div>

                <input type="submit" value="Log in" class="btn btn-primary btn-large btn-block">

            </div>
        </div>
    </div>
</form>
</body>
</html>

这是应用程序的运行控制台。（错误列表）

127.0.0.1 - - [03/Feb/2020 11:58:41] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [03/Feb/2020 11:58:41] "GET / HTTP/1.1" 200 -
[2020-02-03 11:58:54,752] ERROR in app: Exception on /login [POST]
Traceback (most recent call last):
File "C:\Users\OWNER\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 2446, in 
wsgi_app
response = self.full_dispatch_request()
File "C:\Users\OWNER\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1951, in 
full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\OWNER\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1820, in ha 
ndle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\OWNER\PycharmProjects\untitled\venv\lib\site-packages\flask\_compat.py", line 39, in 
reraise
raise value
File "C:\Users\OWNER\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1949, in 
full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\OWNER\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1935, in 
dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:\Users\OWNER\PycharmProjects\untitled\app.py", line 27, in Authenticate
cursor = mysql.connect().cursor()
File "C:\Users\OWNER\PycharmProjects\untitled\venv\lib\site-packages\flaskext\mysql.py", line 54, in 
connect
if self.app.config['MYSQL_DATABASE_SOCKET']:
KeyError: 'MYSQL_DATABASE_SOCKET'
127.0.0.1 - - [03/Feb/2020 11:58:54] "POST /login HTTP/1.1" 500 -

Answer 1

您需要在应用配置中定义MYSQL_DATABASE_SOCKET，而不是在文件中定义为静态变量。

app.config['MYSQL_DATABASE_USER'] = 'root'
app.config['MYSQL_DATABASE_PASSWORD'] = ''
app.config['MYSQL_DATABASE_DB'] = 'invertoryDb'
app.config['MYSQL_DATABASE_HOST'] = 'localhost'
app.config['MYSQL_DATABASE_SOCKET'] = '/tmp/mysql.sock'

MYSQL_DATABASE_SOCKET没有默认值，因此必须在初始化时指定它。在这种情况下，初始化没有发生，所以您遇到了关键错误。

此外，如果您将配置指定为app.config['MYSQL_DATABASE_SOCKET'] = None而不是/tmp/mysql.sock，它将加载默认的unix套接字。

如何解决它的Python烧瓶我们内部服务器的应用程序错误？

1 个答案: