from flask import Flask, render_template, request, redirect, url_for, session
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=TabError, autoincrement=True)
username = db.Column(db.String(20), nullable=False)
password = db.Column(db.String(20), nullable=False)
nickname = db.Column(db.String(20), nullable=True)
# db.create_all() #是否链接成功
# 数据添加
# user=User(username='ma',password='gg')
# db.session.add(user)
# db.session.commit()
#
#
# 数据更新
#
# user = User.query.filter(User.username=='hh').first()
# user.password='gg'
# db.session.commit()
#
#
# 数据查询
# user = User.query.filter(User.username=='ma').first()
# print(user.username,user.password)
#
# 数据删除
# user = User.query.filter(User.username=='ma').first()
# db.session.delete(user)
# db.session.commit()
# session会话连接
# filter()过滤器
# route制定路径和函数之间的关系
# def定义一个变量
@app.route('/')
def switch():
return render_template('switch.html')
@app.route('/login/', methods=['GET', 'POST']) # 跳转登陆,methods定义它有两种请求方式
def login():
if request.method == 'GET':
return render_template('login.html')
else:
username = request.form.get('user')
password = request.form.get('psw')
user = User.query.filter(User.username == username).first() # 判断用户名是否存在
if user:
if user.password == password:
session['user']=username
session.permanent = True
return redirect(url_for('switch'))
else:
return '用户名不存在'
@app.context_processor
def mycontext():
username=session.get('user')
if username:
return {'username':username}
else:
return {}
@app.route('/register/', methods=['GET', 'POST']) # 跳转注册,methods定义它有两种请求方式
def register():
if request.method == 'GET':
return render_template('register.html')
else:
username = request.form.get('user')
password = request.form.get('psw')
nickname = request.form.get('nickname')
user = User.query.filter(User.username == username).first() # 判断用户名是否存在
if user:
return u'该用户已存在'
else:
user = User(username=username, password=password, nickname=nickname)
db.session.add(user)
db.session.commit()
return redirect(url_for('login'))
@app.route('/logout/')
def logout():
session.clear()
return render_template('switch.html')
@app.route('/wenda/')
def wenda():
return render_template('wenda.html')
if __name__ == '__main__':
app.run(debug=True)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>
首页
{% block logintitle %}{% endblock %}
{% block registertitle %}{% endblock %}
{% block wendatitle %}{% endblock %}
</title>
<script>
function mySwitch() {
var oBody= document.getElementById("myBody");
var oOnoff=document.getElementById("myOnOff");
if(oOnoff.src.match("bulbon")){
oOnoff.src="http://www.runoob.com/images/pic_bulboff.gif";
oBody.style.background="black";
oBody.style.color="yellow";
}else{oOnoff.src="http://www.runoob.com/images/pic_bulbon.gif";
oBody.style.background="lightcyan";
oBody.style.color="black";
}
}
</script>
<link rel="stylesheet" type="text/css" href="../static/css/switch.css">
{% block loginhead %}{% endblock %}
{% block registerhead %}{% endblock %}
{% block wendahead %}{% endblock %}
</head>
<body id="myBody" style="background-color: lightcyan">
<nav>
<img src="{{ url_for('static',filename='image/gzsxy.png') }}" alt="" width="20px">
<script>
document.write(Date())
</script>
<br>
<p>{{ username }}context</p>
<a href="{{ url_for('switch') }}">首页</a>
{% if username %}
<a href="#">{{ username }}</a>
<a href="{{ url_for('logout') }}">注销</a>
{% else %}
<a href="{{ url_for('login') }}">登录</a>
<a href="{{ url_for('register') }}">注册</a>
{% endif %}
<a href="{{ url_for('wenda') }}">问答</a>
<input type="text" placeholder="请输入关键字">
<button type="submit">搜索</button>
</nav>
{% block loginbody %}{% endblock %}
{% block registerbody %}{% endblock %}
{% block wendabody %}{% endblock %}
</body>
</html>
