CBV和flash
from flask import Flask,request,render_template,redirect,url_for,flash,get_flashed_messages from flask import views app = Flask(__name__) # type:Flask app.secret_key = "123" @app.route("/") def index(): # flash("6666","tag") # flash("7777","tags") return "123" class LoginClass(views.MethodView): def get(self): # print(get_flashed_messages("tag")) # print(get_flashed_messages()) print(url_for("login")) return render_template("login.html") def post(self): return "123" # self.add_url_rule(rule, endpoint, f, **options) app.add_url_rule("/login",view_func=LoginClass.as_view("login")) @app.before_first_request def asd(): return "123" if __name__ == '__main__': app.run(debug=True)
Flask-session
from flask import Flask, session, render_template, session from flask import views from redis import Redis from flask_session import Session app = Flask(__name__) # type: Flask app.config['SESSION_TYPE'] = 'redis' app.config['SESSION_REDIS'] = Redis('127.0.0.1', 6379, db=8) Session(app) @app.route('/') def index(): session['user'] = 'qwe' # 1a86508c - f214 - 4382 - bfac - e837aaf5b1ed # 将这个作为key 存在了redis中,可以通过get session:1a86508c-f214-4382-bfac-e837aaf5b1ed return '>>>index' class LoginClass(views.MethodView): def get(self): ll = session.get('user') print(ll) return render_template('login.html') def post(self): return '123' app.add_url_rule('/login', view_func=LoginClass.as_view('login')) if __name__ == '__main__': app.run(debug=True)
WTForms
app.py from flask import Flask,request,render_template from flask import views from wtforms.fields import simple,core from wtforms import Form from wtforms import validators # from wtforms import widgets class LoginForm(Form): username = simple.StringField( label="用户名", validators=[ validators.DataRequired(message="不能为空"), validators.Length(min=3,max=5,message="不能小于3位，不能大于5位") ], # widget=widgets.TextInput(), 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 RegForm(Form): username = simple.StringField( label="用户名", validators=[ validators.DataRequired(message="不能为空"), validators.Length(min=3, max=5, message="不能小于3位，不能大于5位") ], # widget=widgets.TextInput(), render_kw={"class": "my_username"} ) nickname = simple.StringField( label="昵称", validators=[ validators.DataRequired(message="不能为空"), ], # widget=widgets.TextInput(), 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"} ) repassword = simple.PasswordField( label="重复密码", validators=[ validators.EqualTo(fieldname="password",message="两次密码不一致") ] ) 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" ) app = Flask(__name__) # type:Flask @app.route("/") def index(): # 87fd0ba1-6c36-44be-bc36-2a95b764e122 return "123" class LoginClass(views.MethodView): def get(self): lf = LoginForm() return render_template("login.html",lf=lf) def post(self): lf = LoginForm(request.form) if lf.validate(): return "123" else: return render_template("login.html", lf=lf) app.add_url_rule("/login",view_func=LoginClass.as_view("login")) class RegClass(views.MethodView): def get(self): rf = RegForm() return render_template("reg.html", rf=rf) def post(self): rf = RegForm(request.form) if rf.validate(): return "123" else: return render_template("reg.html", rf=rf) app.add_url_rule("/reg", view_func=RegClass.as_view("reg")) if __name__ == '__main__': app.run(debug=True)
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta http-equiv="content-Type" charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> </head> <body> <form action="" method="post" novalidate> {{ lf.username.label }}{{ lf.username }}{{ lf.username.errors.0 }} <p>{{ lf.password.label }}{{ lf.password }}{{ lf.password.errors.0 }}</p> <input type="submit" value="提交"> </form> </body> </html>
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta http-equiv="content-Type" charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> </head> <body> <form action="" method="post"> {% for field in rf %} <p>{{ field.label }}{{ field }}{{ field.errors.0 }}</p> {% endfor %} </form> </body> </html>
DBUtils 数据库连接池
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(): conn = POOL.connection() cursor = conn.cursor(pymysql.cursors.DictCursor) cursor.execute('select * from userinfo') result = cursor.fetchall() print(result) conn.close() func()
from DBUtils.PooledDB import PooledDB import pymysql class MySQLhelper(object): def __init__(self, host, port, dbuser, password, database): self.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=host, port=int(port), user=dbuser, password=password, database=database, charset='utf8' ) def create_conn_cursor(self): conn = self.pool.connection() cursor = conn.cursor(pymysql.cursors.DictCursor) return conn,cursor def fetch_all(self, sql, args): conn,cursor = self.create_conn_cursor() cursor.execute(sql,args) result = cursor.fetchall() cursor.close() conn.close() return result def insert_one(self,sql,args): conn,cursor = self.create_conn_cursor() res = cursor.execute(sql,args) conn.commit() conn.close() return res def update(self,sql,args): conn,cursor = self.create_conn_cursor() res = cursor.execute(sql,args) conn.commit() print(res) conn.close() return res sqlhelper = MySQLhelper("127.0.0.1", 3306, "root", "", "db7") # res = sqlhelper.fetch_all("select * from userinfo where id=%s",(5,)) # print(res) # res = sqlhelper.insert_one("insert into userinfo VALUES (%s,%s,%s)",(7,"jinwangba","66666")) # print(res) # sqlhelper.update("update user SET name=%s WHERE id=%s",("yinwangba",1))