Python的瓶 - “检查在MySQL数据库中存在的用户名”

Question

我运行一个python瓶应用程序，它需要一个用户名和密码。我想检查Mysql数据库上存在的用户名。如果是的话，我想回“的用户名存在”的网页上。

下面是我的烧瓶代码：

from flask import Flask,render_template,request,redirect
from flask_mysqldb import MySQL
import yaml

app = Flask(__name__)

db = yaml.load(open('db.yaml'))
app.config['MYSQL_HOST'] = db['mysql_host']
app.config['MYSQL_USER'] = db['mysql_user']
app.config['MYSQL_PASSWORD'] = db['mysql_password']
app.config['MYSQL_DB'] = db['mysql_db']

mysql =MySQL(app)

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

    if request.method == 'POST' and request.method=='GET':
        #fetch form data
        userdetails = request.form
        name = userdetails['name']
        email = userdetails['email']
        cur = mysql.connection.cursor()
        new_value= cur.execute("SELECT (name,email) FROM users where name = %s and email=%s",'name','email')
        if new_value> 0:
            return "the username exists"
        else:
            return "SUCCESS!,Successfully entered into the Database"

    return render_template('index.html')

---

当我运行的应用程序烧瓶，我的网页犯规返回任何东西。

Answer 1

行，所以我不能发表评论，因为我没有足够的声誉然而，因为这是当用户点击一个按钮提交表单获取表单数据的request.method需要被POST。布赖恩·德里斯科尔说，request.method不能同时POST和GET同时，它像是在说：

if bob.age == 15 and bob.age == 50 

鲍勃不能既是15岁到50岁在同一时间，以同样的方式request.method不能在同一时间POST和GET。所以你想要做的是

if request.method == 'POST':
        userdetails = request.form
        name = userdetails['name']
        email = userdetails['email']
        cur = mysql.connection.cursor()
        new_value= cur.execute("SELECT (name,email) FROM users where name = %s and email=%s",'name','email')
        if new_value> 0:
            return "the username exists"
        else:
            return "SUCCESS!,Successfully entered into the Database"

有关POST，GET和其他要求的详细信息，你可以参考文章here