完成注册功能

from flask import Flask,render_template,request,redirect,url_for
from flask_sqlalchemy import SQLAlchemy
import config

app = Flask(__name__)
app.config.from_object(config)

db=SQLAlchemy(app)
class User(db.Model):
    __tablename__ = 'User'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20), nullable=False)
    nickname = db.Column(db.String(20))

db.create_all()
# user=User(username='mis1234',password='111111')
# db.session.add(user)
# db.session.commit()

@app.route('/',methods=['GET','POST'])
def register():
    if request.method=='GET':
        return render_template('登录.html')
    else:
        username=request.form.get('username')
        passward=request.form.get('passward')
        nickname=request.form.get('nickname')
        user=User.query.filter(User.username==username).first()
    if user:
        return 'username existed'
    else:
        user=User(username=username,passward=passward,nickname=nickname)
        db.session.add(user)
        db.session.commit()
        return redirect(url_for('登录'))

@app.route('/load',methods=['GET','POST'])
def load():
    if request.method == 'GET':
        return render_template('登录.html')


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

@app.route('/login/')
def login():
    return render_template('登录.html')

@app.route('/signin/')
def signin():
    return  render_template('zhuce.html')

@app.route('/fabu/')
def fabu():
    return  render_template('发布.html')

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

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