Flask(三)

King

一.wtforms

安装:pip3 install wtforms

用法一:

from flask import Flask, render_template, request, redirect
from wtforms import Form
from wtforms.fields import simple
from wtforms import validators
from wtforms import widgets

app = Flask(__name__, template_folder='templates')

app.debug = True


class LoginForm(Form):
    # 字段（内部包含正则表达式）
    name = simple.StringField(
        label='用户名',
        validators=[
            validators.DataRequired(message='用户名不能为空.'),
            validators.Length(min=6, max=18, message='用户名长度必须大于%(min)d且小于%(max)d')
        ],
        widget=widgets.TextInput(), # 页面上显示的插件
        render_kw={'class': 'form-control'}

    )
    # 字段（内部包含正则表达式）
    pwd = simple.PasswordField(
        label='密码',
        validators=[
            validators.DataRequired(message='密码不能为空.'),
            validators.Length(min=8, message='用户名长度必须大于%(min)d'),
            validators.Regexp(regex="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,}",
                              message='密码至少8个字符，至少1个大写字母，1个小写字母，1个数字和1个特殊字符')

        ],
        widget=widgets.PasswordInput(),
        render_kw={'class': 'form-control'}
    )



@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        form = LoginForm()
        return render_template('login.html', form=form)
    else:
        form = LoginForm(formdata=request.form)
        if form.validate():
            print('用户提交数据通过格式验证，提交的值为：', form.data)
        else:
            print(form.errors)
        return render_template('login.html', form=form)

if __name__ == '__main__':
    app.run()

知识兔

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>登录</h1>
<form method="post">
    <p>{{form.name.label}} {{form.name}} {{form.name.errors[0] }}</p>

    <p>{{form.pwd.label}} {{form.pwd}} {{form.pwd.errors[0] }}</p>
    <input type="submit" value="提交">
</form>
</body>
</html>

知识兔

用法二:

from flask import Flask, render_template, request, redirect
from wtforms import Form
from wtforms.fields import core
from wtforms.fields import html5
from wtforms.fields import simple
from wtforms import validators
from wtforms import widgets

app = Flask(__name__, template_folder='templates')
app.debug = True



class RegisterForm(Form):
    name = simple.StringField(
        label='用户名',
        validators=[
            validators.DataRequired()
        ],
        widget=widgets.TextInput(),
        render_kw={'class': 'form-control'},
        default='cxw'
    )

    pwd = simple.PasswordField(
        label='密码',
        validators=[
            validators.DataRequired(message='密码不能为空.')
        ],
        widget=widgets.PasswordInput(),
        render_kw={'class': 'form-control'}
    )

    pwd_confirm = simple.PasswordField(
        label='重复密码',
        validators=[
            validators.DataRequired(message='重复密码不能为空.'),
            validators.EqualTo('pwd', message="两次密码输入不一致")
        ],
        widget=widgets.PasswordInput(),
        render_kw={'class': 'form-control'}
    )

    email = html5.EmailField(
        label='邮箱',
        validators=[
            validators.DataRequired(message='邮箱不能为空.'),
            validators.Email(message='邮箱格式错误')
        ],
        widget=widgets.TextInput(input_type='email'),
        render_kw={'class': 'form-control'}
    )

    gender = core.RadioField(
        label='性别',
        choices=(
            (1, '男'),
            (2, '女'),
        ),
        #这句话的意思是上面的choices元组的第一个值是int类型
        #如果上上面为(‘1’, '男'),(‘2’, '女'),则下面的coerce则不用写
        coerce=int # “1” “2”
     )
    #这里是单选框
    city = core.SelectField(
        label='城市',
        choices=(
            ('bj', '北京'),
            ('sh', '上海'),
        )
    )
    #这里是多选框
    hobby = core.SelectMultipleField(
        label='爱好',
        choices=(
            (1, '篮球'),
            (2, '足球'),
        ),
        coerce=int
    )
    #这里是多选的checkbox
    favor = core.SelectMultipleField(
        label='喜好',
        choices=(
            (1, '篮球'),
            (2, '足球'),
        ),
        widget=widgets.ListWidget(prefix_label=False),
        option_widget=widgets.CheckboxInput(),
        coerce=int,
        default=[1, 2]
    )
    #这里可以改值
    def __init__(self, *args, **kwargs):
        super(RegisterForm, self).__init__(*args, **kwargs)
        self.favor.choices = ((1, '篮球'), (2, '足球'), (3, '羽毛球'))

    def validate_pwd_confirm(self, field):
        """
        自定义pwd_confirm字段规则，例：与pwd字段是否一致
        :param field:
        :return:
        """
        # 最开始初始化时，self.data中已经有所有的值

        if field.data != self.data['pwd']:
            # raise validators.ValidationError("密码不一致") # 继续后续验证
            raise validators.StopValidation("密码不一致")  # 不再继续后续验证


@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'GET':
        #这里可以传默认值
        form = RegisterForm(data={'gender': 2,'hobby':[1,]}) # initial
        return render_template('register.html', form=form)
    else:
        form = RegisterForm(formdata=request.form)
        if form.validate():
            print('用户提交数据通过格式验证，提交的值为：', form.data)
        else:
            print(form.errors)
        return render_template('register.html', form=form)



if __name__ == '__main__':
    app.run()

知识兔

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>用户注册</h1>
<form method="post" novalidate style="padding:0  50px">
    {% for field in form %}
    <p>{{field.label}}: {{field}} {{field.errors[0] }}</p>
    {% endfor %}
    <input type="submit" value="提交">
</form>
</body>
</html>

知识兔

二.多app应用

from werkzeug.wsgi import DispatcherMiddleware
from werkzeug.serving import run_simple
from flask import Flask, current_app
app1 = Flask('app01')
app2 = Flask('app02')

@app1.route('/index')
def index():
    return "app01"

@app2.route('/index2')
def index2():
    return "app2"

# http://www.oldboyedu.com/index
# http://www.oldboyedu.com/sec/index2
dm = DispatcherMiddleware(app1, {
    '/sec': app2,
})

if __name__ == "__main__":
    run_simple('localhost', 5000, dm)

知识兔

三.flask-script (manage.py就是当前要执行的文件)

from flask import Flask,request
from flask_script import Manager
app = Flask(__name__)
manager=Manager(app)

@app.route("/")
def index():
    return "ok"


if __name__ == '__main__':
    manager.run()
#以后在执行，直接：python3 manage.py runserver
#python3 manage.py runserver --help

知识兔

自定义命令:

from flask import Flask
from flask_script import Manager
app = Flask(__name__)
manager=Manager(app)

@app.route("/")
def index():
    return "ok"

@manager.command
def custom1(arg):
    """
    自定义命令
    python manage.py custom 123
    :param arg:
    :return:
    """
    print(arg)


@manager.option('-n', '--name', dest='name')
@manager.option('-u', '--url', dest='url')
def cmd(name, url):
    """
    自定义命令（-n也可以写成--name）
    执行： python manage.py  cmd -n lqz -u http://www.oldboyedu.com
    执行： python manage.py  cmd --name lqz --url http://www.oldboyedu.com
    :param name:
    :param url:
    :return:
    """
    print(name, url)
#有什么用？
#把excel的数据导入数据库，定制个命令，去执行

if __name__ == '__main__':
    manager.run()

知识兔

四.SQLAlchemy

介绍

SQLAlchemy是一个基于Python实现的ORM框架。该框架建立在 DB API之上，使用关系对象映射进行数据库操作，简言之便是：将类和对象转换成SQL，然后使用数据API执行SQL并获取执行结果。

pip3 install sqlalchemy

知识兔

组成部分：

Engine，框架的引擎
Connection Pooling ，数据库连接池
Dialect，选择连接数据库的DB API种类
Schema/Types，架构和类型
SQL Exprression Language，SQL表达式语言

知识兔

SQLAlchemy本身无法操作数据库，其必须以来pymsql等第三方插件，Dialect用于和数据API进行交流，根据配置文件的不同调用不同的数据库API，从而实现对数据库的操作，如：

MySQL-Python
    mysql+mysqldb://<user>:<password>@<host>[:<port>]/<dbname>
    
pymysql
    mysql+pymysql://<username>:<password>@<host>/<dbname>[?<options>]
    
MySQL-Connector
    mysql+mysqlconnector://<user>:<password>@<host>[:<port>]/<dbname>
    
cx_Oracle
    oracle+cx_oracle://user:pass@host:port/dbname[?key=value&key=value...]
    
更多：http://docs.sqlalchemy.org/en/latest/dialects/index.html

知识兔

创建表模型,初始化和删除表,不可修改字段:

import datetime
from sqlalchemy import create_engine
from sqlalchemy.orm import  relationship
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, Text, ForeignKey, DateTime, UniqueConstraint, Index
Base = declarative_base()

class Users(Base):
    __tablename__ = 'users'  # 数据库表名称
    id = Column(Integer, primary_key=True)  # id 主键,autoincrement
    name = Column(String(32), index=True, nullable=False)  # name列，索引，不可为空
    age =Column(Integer,default=0)
    def __repr__(self):
        return self.name +"_"+str(self.id)
    #email = Column(String(32), unique=True)
    # #datetime.datetime.now不能加括号，加了括号，以后永远是当前时间
    # ctime = Column(DateTime, default=datetime.datetime.now)
    # extra = Column(Text, nullable=True)

    # __table_args__ = (
    #     UniqueConstraint('id', 'name', name='uix_id_name'), #联合唯一
    #     Index('ix_id_name', 'name', 'email'), #索引
    # )
#
class use1(Base):
    __tablename__ = 'users1'  # 数据库表名称
    ids = Column(Integer, primary_key=True)  # id 主键,autoincrement
    names = Column(String(32), index=True, nullable=False)  #


class Hobby(Base):
    __tablename__ = 'hobby'
    id = Column(Integer, primary_key=True)
    caption = Column(String(50), default='篮球')


class Person(Base):
    __tablename__ = 'person'
    nid = Column(Integer, primary_key=True)
    name = Column(String(32), index=True, nullable=True)
    # hobby指的是tablename而不是类名，uselist=False
    hobby_id = Column(Integer, ForeignKey("hobby.id"))

    # 跟数据库无关，不会新增字段，只用于快速链表操作
    # 类名，backref用于反向查询
    hobby = relationship('Hobby', backref='pers')


class Boy2Girl(Base):
    __tablename__ = 'boy2girl'
    id = Column(Integer, primary_key=True, autoincrement=True)
    girl_id = Column(Integer, ForeignKey('girl.id'))
    boy_id = Column(Integer, ForeignKey('boy.id'))


class Girl(Base):
    __tablename__ = 'girl'
    id = Column(Integer, primary_key=True)
    name = Column(String(64), unique=True, nullable=False)


class Boy(Base):
    __tablename__ = 'boy'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(64), unique=True, nullable=False)
    # 与生成表结构无关，仅用于查询方便,放在哪个单表中都可以
    girl = relationship('Girl', secondary='boy2girl', backref='boys')


def init_db1():
    """
    根据类创建数据库表
    :return:
    """
    engine = create_engine(
        "mysql+pymysql://root:root@127.0.0.1:3306/aaa?charset=utf8",
        max_overflow=0,  # 超过连接池大小外最多创建的连接
        pool_size=5,  # 连接池大小
        pool_timeout=30,  # 池中没有线程最多等待的时间，否则报错
        pool_recycle=-1  # 多久之后对线程池中的线程进行一次连接的回收（重置）
    )

    Base.metadata.create_all(engine)

def drop_db():
    """
    根据类删除数据库表
    :return:
    """
    engine = create_engine(
        "mysql+pymysql://root:root@127.0.0.1:3306/aaa?charset=utf8",
        max_overflow=0,  # 超过连接池大小外最多创建的连接
        pool_size=5,  # 连接池大小
        pool_timeout=30,  # 池中没有线程最多等待的时间，否则报错
        pool_recycle=-1  # 多久之后对线程池中的线程进行一次连接的回收（重置）
    )

    Base.metadata.drop_all(engine)

if __name__ == '__main__':
    #drop_db()
    init_db1()

知识兔

orm操作及线程安全scoped_session::

from sqlalchemy.orm import sessionmaker,scoped_session
from sqlalchemy import create_engine
from models import Users

engine = create_engine("mysql+pymysql://root:root@127.0.0.1:3306/aaa", max_overflow=0, pool_size=5)
Session = sessionmaker(bind=engine)

"""
# 线程安全，基于本地线程实现每个线程用同一个session
# 特殊的：scoped_session中有原来方法的Session中的一下方法：

public_methods = (
    '__contains__', '__iter__', 'add', 'add_all', 'begin', 'begin_nested',
    'close', 'commit', 'connection', 'delete', 'execute', 'expire',
    'expire_all', 'expunge', 'expunge_all', 'flush', 'get_bind',
    'is_modified', 'bulk_save_objects', 'bulk_insert_mappings',
    'bulk_update_mappings',
    'merge', 'query', 'refresh', 'rollback',
    'scalar'
)
"""
#scoped_session类并没有继承Session,但是却又它的所有方法
session = scoped_session(Session)

# ############# 执行ORM操作 #############
obj1 = Users(name="lqz")
session.add(obj1)

# 提交事务
session.commit()
# 关闭session
session.close()

知识兔

单表增删改查:

import time
import threading
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, ForeignKey, UniqueConstraint, Index
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy import create_engine
from sqlalchemy.sql import text

from models import Users,use1

engine = create_engine("mysql+pymysql://root:root@127.0.0.1:3306/aaa", max_overflow=0, pool_size=5)
Session = sessionmaker(bind=engine)

session = Session()

# ################ 添加 ################
#
# obj1 = Users(name="wupeiqi",age=19)
# session.add(obj1)
#
# session.add_all([
#     Users(name="lqz",age=18),
#     Users(name="egon",age=20),
#     use1(names="c1.com"),
# ])
# session.commit()



# ################ 删除 ################

# session.query(Users).filter(Users.id > 4).delete()
# session.commit()

# ################ 修改 ################

#传字典
# session.query(Users).filter(Users.id > 0).update({"name" : "lqz"})
#类似于django的F查询，这个后面必须配合synchronize_session，
#如果是字符串就用False，如果是数字就用#evaluata
# session.query(Users).filter(Users.id > 0).update({Users.name: Users.name + "099"}, synchronize_session=False)
# session.query(Users).filter(Users.id > 0).update({"age": Users.age + 1}, synchronize_session="evaluate")
# session.commit()

# ################ 查询 ################

# r1 = session.query(Users).all()
# print(r1[0].name)
#只取age列，把name重命名为xx
# r2 = session.query(Users.name.label('xx'), Users.age).all()
# print(r2[0].xx)
#filter传的是表达式，filter_by传的是参数
# r3 = session.query(Users).filter(Users.name == "lqz").all()
# print(r3[0].name)
# r4 = session.query(Users).filter_by(name='lqz').all()
# print(r4[0].name)
# r5 = session.query(Users).filter_by(name='lqz').first()
# print(r5.name)
#:value 和:name 相当于占位符，用params传参数
# r6 = session.query(Users).filter(text("id<:value and name=:name")).params(value=224, name='fred').order_by(Users.id).all()
#自定义查询sql
#r7 = session.query(Users).from_statement(text("SELECT * FROM users where name=:name")).params(name='ed').all()



#　条件
# ret = session.query(Users).filter_by(name='lqz').all()
#表达式，and条件连接
# ret = session.query(Users).filter(Users.id > 2, Users.name == 'lqz').all()
# print(ret[0].name,ret[0].id)

# ret = session.query(Users).filter(Users.id.between(1, 3)).all()
# print(ret)
#注意下划线
# ret = session.query(Users).filter(Users.id.in_([1,3,4])).all()
# print(ret)
#~非，除。。外
# ret = session.query(Users).filter(~Users.id.in_([1,3,4])).all()
# print(ret)
#二次筛选
# ret = session.query(Users).filter(Users.id.in_(session.query(Users.id).filter(Users.name=='lqz'))).all()
# print(ret)
from sqlalchemy import and_, or_
#or_包裹的都是or条件，and_包裹的都是and条件
# ret = session.query(Users).filter(and_(Users.id > 3, Users.name == 'lqz')).all()

# ret = session.query(Users).filter(or_(Users.id < 2, Users.name == 'lqz')).all()
# print(ret)
# ret = session.query(Users).filter(
#     or_(
#         Users.id < 2,
#         and_(Users.name == 'eric', Users.id > 3),
#         Users.extra != ""
#     )).all()


# 通配符，以e开头，不以e开头  (_代表占位)
# ret = session.query(Users).filter(Users.name.like('_u%')).all()
# print(ret)
# ret = session.query(Users).filter(~Users.name.like('e%')).all()

# 限制，用于分页，区间
# ret = session.query(Users).all()[1:2]
# print(ret)

# 排序，根据name降序排列（从大到小）
# ret = session.query(Users).order_by(Users.name.desc()).all()
#第一个条件重复后，再按第二个条件升序排
# ret = session.query(Users).order_by(Users.name.desc(), Users.id.asc()).all()
# print(ret)

# 分组
# from sqlalchemy.sql import func
#
# ret = session.query(Users).group_by(Users.name).all()
# print(ret)
#分组之后取最大id，id之和，最小id
# ret = session.query(
#     func.max(Users.id),
#     func.sum(Users.id),
#     func.min(Users.id)).group_by(Users.name).all()
# print(ret)
#haviing筛选
# ret = session.query(
#     func.max(Users.id),
#     func.sum(Users.id),
#     func.min(Users.id)).group_by(Users.name).having(func.min(Users.id) >2).all()
# print(ret)

#增，删，改都要commit()
session.close()

知识兔

一对多: 一个爱好对应多个人

class Hobby(Base):
    __tablename__ = 'hobby'
    id = Column(Integer, primary_key=True)
    caption = Column(String(50), default='篮球')


class Person(Base):
    __tablename__ = 'person'
    nid = Column(Integer, primary_key=True)
    name = Column(String(32), index=True, nullable=True)
    # hobby指的是tablename而不是类名，uselist=False
    hobby_id = Column(Integer, ForeignKey("hobby.id"))

    # 跟数据库无关，不会新增字段，只用于快速链表操作
    # 类名，backref用于反向查询
    hobby = relationship('Hobby', backref='pers')

知识兔

基本操作

import time
import threading

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, ForeignKey, UniqueConstraint, Index
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy import create_engine
from sqlalchemy.sql import text
from sqlalchemy.engine.result import ResultProxy
from models import Users, Hobby, Person

engine = create_engine("mysql+pymysql://root:root@127.0.0.1:3306/aaa?charset=utf8", max_overflow=0, pool_size=5)
Session = sessionmaker(bind=engine)
session = Session()
# 添加一

# session.add_all([
#     Hobby(caption='乒乓球'),
#     Hobby(caption='羽毛球'),
#     Person(name='张三', hobby_id=1),
#     Person(name='李四', hobby_id=2),
# ])

# person = Person(name='张九', hobby=Hobby(caption='姑娘'))
# session.add(person)
#添加二
# hb = Hobby(caption='人妖')
# hb.pers = [Person(name='文飞'), Person(name='博雅')]
# session.add(hb)
#
# session.commit()


# 使用relationship正向查询

# v = session.query(Person).filter(Person.hobby_id==4).first()
# print(v.name)
# print(v.hobby.caption)


# 使用relationship反向查询

# v = session.query(Hobby).filter(Hobby.id==4).first()
# print(v.caption)
# print(v.pers)

#方式一，自己链表
# person_list=session.query(Person).join(Hobby,isouter=True)

# ret = session.query(Person).join(Hobby,Person.nid == Hobby.id, isouter=True)
# print(ret)
# print(person_list)
# person_list=session.query(Person,Hobby).join(Hobby,isouter=True).all()
# for row in person_list:
#     # print(row.name,row.caption)
#     print(row[0].name,row[1].caption)

#方式二：通过relationship

# person_list=session.query(Person).all()
# for row in person_list:
#     print(row.name,row.hobby.caption)
#查询喜欢姑娘的所有人
# obj=session.query(Hobby).filter(Hobby.id==1).first()
# persons=obj.pers


session.close()

知识兔

多对多:

class Boy2Girl(Base):
    __tablename__ = 'boy2girl'
    id = Column(Integer, primary_key=True, autoincrement=True)
    girl_id = Column(Integer, ForeignKey('girl.id'))
    boy_id = Column(Integer, ForeignKey('boy.id'))


class Girl(Base):
    __tablename__ = 'girl'
    id = Column(Integer, primary_key=True)
    name = Column(String(64), unique=True, nullable=False)


class Boy(Base):
    __tablename__ = 'boy'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(64), unique=True, nullable=False)
    # 与生成表结构无关，仅用于查询方便,放在哪个单表中都可以
    girl = relationship('Girl', secondary='boy2girl', backref='boys')

知识兔

基本操作:

from sqlalchemy.orm import sessionmaker
from sqlalchemy import create_engine
from models import Girl,Boy,Boy2Girl

engine = create_engine("mysql+pymysql://root:root@127.0.0.1:3306/aaa?charset=utf8", max_overflow=0, pool_size=5)
Session = sessionmaker(bind=engine)
session = Session()
# 添加

# session.add_all([
#     Girl(name='g_com1'),
#     Girl(name='g2.com1'),
#     Boy(name='A组1'),
#     Boy(name='B组2'),
# ])
# session.commit()
# '''
# s2g = Boy2Girl(girl_id=2, boy_id  =2)
# session.add(s2g)
# session.commit()
#
正向添加
# gp = Boy(name='C组')
# gp.girl = [Girl(name='c3.com'),Girl(name='c4.com')]
# session.add(gp)
# session.commit()
#
反向添加
# """
# ser = Girl(name='c6.com')
# ser.boys = [Boy(name='F组pp'),Boy(name='G组ll')]
# session.add(ser)
# session.commit()
#
# """
#
#
# # 使用relationship正向查询
# """
# '''
# v = session.query(Boy).filter(Boy.id==2).first()
# print(v.name)
# print(v.girl)
# '''
# # 使用relationship反向查询
#
# '''
# v = session.query(Girl).filter(Girl.id==3).first()
# print(v.name)
# print(v.boys[0].name)
#
#
# session.close()

知识兔

五.flask_sqlalchemy和sql_migrate

sansa---------views--------------- |
   |           |                   |-----account.py
   |           |
manage.py      |----_init_.py
   |
   |           |
settings.py    |
               |----models.py

知识兔

manage.py:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
"""
生成依赖文件：
    pipreqs ./

"""
from sansa import create_app
from flask_script import Manager
from flask_migrate import Migrate,MigrateCommand
from sansa import db
app = create_app()
manager=Manager(app)

Migrate(app,db)
manager.add_command('db1', MigrateCommand)

if __name__ == '__main__':
    # app.run()
    manager.run()

知识兔

init.py:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()

from .models import *
from .views import account

def create_app():
    app = Flask(__name__)
    app.config.from_object('settings.DevelopmentConfig')

    # 将db注册到app中
    db.init_app(app)

    # 注册蓝图
    app.register_blueprint(account.account)


    return app

知识兔

account.py:

#!/usr/bin/env python
# -*- coding:utf-8 -*-

from flask import Blueprint
from .. import db
from .. import models

account = Blueprint('account', __name__)


@account.route('/login')
def login():
    db.session.add(models.Users(username='lqz', email='123'))
    db.session.query(models.Users).all()
    db.session.commit()
    # 添加示例
    """
    db.session.add(models.Users(username='lqz', pwd='123', gender=1))
    db.session.commit()

    obj = db.session.query(models.Users).filter(models.Users.id == 1).first()
    print(obj)

    PS: db.session和db.create_session
    """
    # db.session.add(models.Users(username='wupeiqi1', email=该邮件地址已受到反垃圾邮件插件保护。要显示它需要在浏览器中启用 JavaScript。'))
    # db.session.commit()
    # db.session.close()
    #
    # db.session.add(models.Users(username='wupeiqi2', email=该邮件地址已受到反垃圾邮件插件保护。要显示它需要在浏览器中启用 JavaScript。'))
    # db.session.commit()
    # db.session.close()
    # db.session.add(models.Users(username='alex1',email=该邮件地址已受到反垃圾邮件插件保护。要显示它需要在浏览器中启用 JavaScript。'))
    # db.session.commit()
    # db.session.close()



    user_list = db.session.query(models.Users).all()
    db.session.close()
    for item in user_list:
        print(item.username)


    return 'login'

知识兔

settings.py (引擎不用注册):

#!/usr/bin/env python
# -*- coding:utf-8 -*-

class BaseConfig(object):
    # SESSION_TYPE = 'redis'  # session类型为redis
    # SESSION_KEY_PREFIX = 'session:'  # 保存到session中的值的前缀
    # SESSION_PERMANENT = True  # 如果设置为False，则关闭浏览器session就失效。
    # SESSION_USE_SIGNER = False  # 是否对发送到浏览器上 session:cookie值进行加密

    SQLALCHEMY_DATABASE_URI = "mysql+pymysql://root:root@127.0.0.1:3306/bbb?charset=utf8"
    SQLALCHEMY_POOL_SIZE = 5
    SQLALCHEMY_POOL_TIMEOUT = 30
    SQLALCHEMY_POOL_RECYCLE = -1

    # 追踪对象的修改并且发送信号
    SQLALCHEMY_TRACK_MODIFICATIONS = False


class ProductionConfig(BaseConfig):
    pass


class DevelopmentConfig(BaseConfig):
    pass


class TestingConfig(BaseConfig):
    pass

知识兔

models.py:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from . import db


class Users(db.Model):
    """
    用户表
    """
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)
    ids = db.Column(db.Integer)

    def __repr__(self):
        return '<User %r>' % self.username

知识兔

执行命令:

flask-migrate  
 python3 manage.py db1 init   初始化：只执行一次

 python3 manage.py db1 migrate 等同于 makemigartions
 python3 manage.py db1 upgrade  等同于migrate

知识兔

执行并登login即可添加数据:

python3 manage.py runserver

知识兔

计算机

2022年2月04日

Flask(三)

一.wtforms

四.SQLAlchemy

介绍

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