作业21
1 from flask import Flask, render_template, request, redirect, url_for, session
2 from flask_sqlalchemy import SQLAlchemy
3 import config
4 from functools import wraps
5 from datetime import datetime
6
7 app = Flask(__name__)
8 app.config.from_object(config)
9 db = SQLAlchemy(app)
10
11
12 class User(db.Model):
13 __tablename__ = 'user'
14 id = db.Column(db.Integer, primary_key=True, autoincrement=True)
15 username = db.Column(db.String(20), nullable=False)
16 password = db.Column(db.String(20), nullable=False)
17 nickname = db.Column(db.String(20), nullable=True)
18
19 class Question(db.Model):
20 __tablename__ = 'question'
21 id = db.Column(db.Integer, primary_key=True, autoincrement=True)
22 author_id=db.column(db.Integer,db.ForeignKey('user.id'))
23 title=db.Column(db.String(100), nullable=False)
24 detail=db.Column(db.Text, nullable=False)
25 creat_time=db.column(db.DateTime,default=datetime.now)
26 author=db.relationship('User',backref=db.backref('question'))
27
28 db.create_all() #是否链接成功
29
30
31 # 数据添加
32 # user=User(username='ma',password='gg')
33 # db.session.add(user)
34 # db.session.commit()
35 #
36 #
37 # 数据更新
38 #
39 # user = User.query.filter(User.username=='hh').first()
40 # user.password='gg'
41 # db.session.commit()
42 #
43 #
44 # 数据查询
45 # user = User.query.filter(User.username=='ma').first()
46 # print(user.username,user.password)
47 #
48 # 数据删除
49 # user = User.query.filter(User.username=='ma').first()
50 # db.session.delete(user)
51 # db.session.commit()
52
53
54 # session会话连接
55 # filter()过滤器
56 # route制定路径和函数之间的关系
57 # def定义一个变量
58
59 @app.route('/')
60 def switch():
61 return render_template('switch.html')
62
63
64 @app.route('/login/', methods=['GET', 'POST']) # 跳转登陆,methods定义它有两种请求方式
65 def login():
66 if request.method == 'GET':
67 return render_template('login.html')
68 else:
69 username = request.form.get('user')
70 password = request.form.get('psw')
71 user = User.query.filter(User.username == username).first() # 判断用户名是否存在
72 if user:
73 if user.password == password:
74 session['user']=username
75 session.permanent = True
76 return redirect(url_for('switch'))
77 else:
78 return '用户名不存在'
79 @app.context_processor
80 def mycontext():
81 username=session.get('user')
82 if username:
83 return {'username':username}
84 else:
85 return {}
86
87 def loginFirst(func):
88 @wraps(func)
89 def wrapper(*args,**kwargs):
90 if session.get('user'):
91 return func(*args,**kwargs)
92 else:
93 return redirect(url_for('login'))
94 return wrapper
95
96 # @app.route('/question/', methods=['GET', 'POST'])
97 # @loginFirst
98 # def question():
99 # if request.method=='GET':
100 # return render_template('question.html')
101 # else:
102 # title=request.form.get('title')
103 # detail=request.form.get('detail')
104 # author_id=User.query.filter(User.username==session.get('user')).first().id
105 # question=Question(title= title,detail=detail,quthor_id=author_id)
106 # db.session.add( question )
107 # db.session.comit()
108 # return (url_for('index'))
109
110 @app.route('/register/', methods=['GET', 'POST']) # 跳转注册,methods定义它有两种请求方式
111 def register():
112 if request.method == 'GET':
113 return render_template('register.html')
114 else:
115
116 username = request.form.get('user')
117 password = request.form.get('psw')
118 nickname = request.form.get('nickname')
119 user = User.query.filter(User.username == username).first() # 判断用户名是否存在
120 if user:
121 return u'该用户已存在'
122 else:
123 user = User(username=username, password=password, nickname=nickname)
124 db.session.add(user)
125 db.session.commit()
126 return redirect(url_for('login'))
127
128 @app.route('/logout/')
129 def logout():
130 session.clear()
131 return render_template('switch.html')
132
133 @app.route('/wenda/')
134 def wenda():
135 return render_template('wenda.html')
136
137
138 if __name__ == '__main__':
139 app.run(debug=True)
