1.Flask的CBV模式，继承 views.MethodView
代码语言：javascript
复制from flask import Flask, views
app = Flask(__name__)
# 继承 views.MethodView
class LoginView(views.MethodView):
def get(self):
return 'get 请求'
def post(self):
return 'post 请求'
# 第一个参数是路由，第二个参数是指定类，注意加上 'login'，类似于 endpoint 参数
app.add_url_rule('/login', view_func=LoginView.as_view('login'))
if __name__ == '__main__':
app.run()
2.session写进redis，替换原来的使用机制
代码语言：javascript
复制from flask import Flask, render_template, redirect, request, session
from flask_session import Session
from redis import Redis
app = Flask(__name__)
# 不再有 secret_key
# 配置储存session方式
app.config["SESSION_TYPE"] = "redis"
# 配置redis连接
app.config["SESSION_REDIS"] = Redis("127.0.0.1", 6379)
# 包裹一层 session
Session(app)
@app.route('/', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
# 登录时写进
session['user'] = request.form.get('username', '')
return redirect('/detail')
return render_template('login.html')
# 视图校验器
def is_login(func):
def inner(*args, **kwargs):
if not session.get('user', ''):
return redirect('/')
res = func(*args, **kwargs)
return res
return inner
# 必须声明 endpoint 参数，一般就是被装饰的函数名
@app.route('/detail', endpoint='detail')
@is_login
def detail():
return 'This is detail page'
if __name__ == '__main__':
app.run()
3.Flask的form
3.1视图中
代码语言：javascript
复制from flask import Flask, render_template, request, views
from wtforms.fields import simple, core
from wtforms import Form
from wtforms import validators
app = Flask(__name__)
class RegisterForm(Form):
username = simple.StringField(
label='用户名',
validators=[
validators.data_required(message='用户名不能为空'),
validators.length(min=5, max=7, message='长度在不能低于5位，不能高于7位')
],
# 给这个输入框添加一个 class
render_kw={"class": "my_username"}
)
password = simple.PasswordField(
label="密码",
validators=[
validators.DataRequired(message="不能为空"),
validators.Length(min=6, max=6, message="密码必须为6位"),
validators.Regexp(regex="d ", message="密码必须位数字"),
],
# widget=widgets.TextInput(),
render_kw={"class": "my_password"}
)
class RegisterView(views.MethodView):
def get(self):
reg_form_obj = RegisterForm()
return render_template('register.html', reg_form_obj=reg_form_obj)
def post(self):
# 校验数据
reg_form_obj = RegisterForm(request.form)
if reg_form_obj.validate():
return '校验成功'
return render_template('register.html', reg_form_obj=reg_form_obj)
app.add_url_rule('/reg', view_func=RegisterView.as_view('reg'))
if __name__ == '__main__':
app.run()
3.2HTML中
代码语言：javascript
复制<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>注册</h1>
<form action="" method="post" novalidate>
{% for field in reg_form_obj %}
<div>{{ field.label }}{{ field }}</div>
<div>{{ field.errors.0 }}</div>
{% endfor %}
<button type="submit">提交</button>
</form>
</body>
</html>
3.3实际效果
3.4其他常用 form
代码语言：javascript
复制email = simple.StringField(
label="昵称",
validators=[
validators.Email(message="格式不正确"),
],
# widget=widgets.TextInput(),
render_kw={"class": "my_username"}
)
gender = core.RadioField(
label="性别",
coerce=int,
choices=(
(1, "女"),
(2, "男")
),
default=1
)
hobby = core.SelectMultipleField(
label="爱好",
coerce=int,
choices=(
(1, "小姐姐"),
(2, "小萝莉"),
(3, "小哥哥"),
(4, "小正太"),
(5, "阿姨"),
(6, "大叔"),
),
default=(1, 2, 5)
)
submit = simple.SubmitField(
label="提交"
)
4.DBUtils
代码语言：javascript
复制import pymysql
from DBUtils.PooledDB import PooledDB
POOL = PooledDB(
creator=pymysql, # 使用链接数据库的模块
maxconnections=6, # 连接池允许的最大连接数，0和None表示不限制连接数
mincached=2, # 初始化时，链接池中至少创建的空闲的链接，0表示不创建
maxcached=5, # 链接池中最多闲置的链接，0和None不限制
maxshared=3,
# 链接池中最多共享的链接数量，0和None表示全部共享。PS: 无用，因为pymysql和MySQLdb等模块的 threadsafety都为1，所有值无论设置为多少，_maxcached永远为0，所以永远是所有链接都共享。
blocking=True, # 连接池中如果没有可用连接后，是否阻塞等待。True，等待；False，不等待然后报错
maxusage=None, # 一个链接最多被重复使用的次数，None表示无限制
setsession=[], # 开始会话前执行的命令列表。如：["set datestyle to ...", "set time zone ..."]
ping=0,
# ping MySQL服务端，检查是否服务可用。
# 如：0 = None = never, 1 = default = whenever it is requested,
# 2 = when a cursor is created, 4 = when a query is executed, 7 = always
host='127.0.0.1',
port=3306,
user='root',
password='',
database='db7',
charset='utf8'
)
def func():
# 建立连接
conn = POOL.connection()
# 建立游标，返回字典数据类型
cursor = conn.cursor(pymysql.cursors.DictCursor)
# 执行对应 SQL
cursor.execute('select * from userinfo')
# 打印结果
result = cursor.fetchall()
print(result)
# 将连接返还给连接池
conn.close()
func()
