flask表单后端增删查改方法记录总结（简单）

至此，一个简单的由前端向后端的form表单增删查改（基础）方式已经完成

# 用户删除
@bp.route('/delete', methods=['GET', 'POST'])
def delete():
    if request.method == 'GET':
        return render_template('delete.html')
    else:
        form = DeleteForm(request.form)
        if form.validate():
            username = form.username.data
            user = Usermodel.query.filter_by(username=username).first()
            if not user:
                print('User not found')
                return redirect(url_for('auth.delete'))
            else:
                Usermodel.query.filter_by(username=form.username.data).delete()
                db.session.commit()
                return "用户已删除完毕"

# 邮箱修改
@bp.route('update', methods=['GET', 'POST'])
def update():
    if request.method == 'GET':
        return render_template('update.html')
    else:
        form = UpdateForm(request.form)
        if form.validate():
            username = form.username.data
            user = Usermodel.query.filter_by(username=username).first()
            if not user:
                print("用户在数据库中不存在")
                return redirect(url_for('auth.update'))
            else:
                Usermodel.query.filter_by(username=form.username.data).update({'email': form.email.data})
                db.session.commit()
                return redirect(url_for('/'))



# 登录界面及密码验证
@bp.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        form = LoginForm(request.form)
        if form.validate():
            username = form.username.data
            password = form.password.data
            user = Usermodel.query.filter_by(username=username).first()
            if not user:
                print("用户在数据库中不存在！")
                return redirect(url_for('auth.login'))
            if check_password_hash(user.password, password):
                # cookie:只能存储少量东西--通过cookie识别,通常存放登录授权的东西
                # flask中的session，是通过加密后存储在cookie中的
                session['user_id'] = user.id
                return redirect('/')
            else:
                print('密码错误!')
                return redirect(url_for('auth.login'))
        else:
            print(form.errors)
            return redirect(url_for('auth.login'))


# 表单验证：flask-wtf

@bp.route('/myregister', methods=['GET', 'POST'])
def register():
    if request.method == 'GET':
        return render_template('myregist.html')
    else:
        # 表单验证：flask-wtf: wtforms
        form = RegistrationForm(request.form)
        if form.validate():
            username = form.username.data
            password = form.password.data
            email = form.email.data
            user = Usermodel(username=username, password=generate_password_hash(password), email=email)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('auth.login'))
        else:
            print(form.errors)
            return redirect(url_for('auth.register'))

这是这段时间学习的一个小的记录，其中flask用到的方法有：

Blueprint, render_template, request, redirect, url_for, session

.form中有：

RegistrationForm, LoginForm, UpdateForm, DeleteForm（这些是我自己在form中创建的类，其实可以不用那么麻烦，因为存在重复的内容，存在“尸体”代码）

from werkzeug.security import generate_password_hash, check_password_hashh

还导入了该方法对密码进行加密 ------ 以下是该author.py导入的库

from flask import Blueprint, render_template, request, redirect, url_for, session
from sqlalchemy.testing.pickleable import User
from exts import mail, db
from flask_mail import Message
from .forms import RegistrationForm, LoginForm, UpdateForm, DeleteForm
from models import Usermodel
from werkzeug.security import generate_password_hash, check_password_hash

# 这里的url_prefix代表的蓝图前缀，以后访问就是以/auth/...来访问
bp = Blueprint('auth', __name__, url_prefix='/auth')