[英]Python Flask - “ Check if the username exists in the MySQL database”
我正在運行一個使用用戶名和密碼的python Flask應用程序。 我想檢查用戶名是否存在於Mysql數據庫中。 如果是這樣,我想在網頁上返回“用戶名存在”。
下面是我的燒瓶代碼:
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')
當我運行flask應用程序時,我的網頁沒有返回任何內容。
好的,所以我不能發表評論,因為我沒有足夠的聲譽來獲取表單數據, request.method
必須是POST
因為那是當用戶單擊按鈕提交表單時。 正如Brian Driscoll所說, request.method
不能同時是POST
和GET
,就像這樣說:
if bob.age == 15 and bob.age == 50
bob不能同時使用15和50歲,也不能使用request.method
方式同時進行POST
和GET
。 所以你要做的是
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"
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