1 app.config[‘SQLALCHEMY_DATABASE_URI‘] = ‘mysql+mysqldb://<数据库用户名>:<密码>@<数据库地址>/<数据库名称>?charset=utf8‘

1 class User(db.Model):
2     __tablename__ = ‘username‘
3     id = db.Column(db.Integer,primary_key=True)
4     name = db.Column(db.String(64),unique = True,index= True)
5 
6     def __repr__(self):
7         return ‘<User {0}>‘.format(self.name)

 1 @app.route(‘/user‘,methods=[‘GET‘,‘POST‘])
 2 def user():
 3     name = None
 4     new = False
 5     form = NameForm()
 6     if form.validate_on_submit():
 7         name = form.name.data
 8         form.name.data = ‘‘
 9         if User.query.filter_by(name=name).first() is None:
10             db.session.add(User(name = name))
11             db.session.commit()
12             new = True
13     return render_template(‘user.html‘,form = form,name = name,new = new)

 1 {% block page_content %}
 2     <div class="container">
 3         <div class="row">
 4             <div class="col-md-3">
 5                 {{ wtf.quick_form(form) }}
 6                 {% if name %}
 7                     {% if new  %}
 8                         <h1> Welcome, {{ name }}</h1>
 9                     {% else %}
10                         <h1>See you again, {{ name }}</h1>
11                     {% endif %}
12                 {% endif %}
13             </div>
14         </div>
15     </div>
16 {% endblock %}