没有使用Flask（Python）将HTML表单中的数据传递给MySQL

我需要一些帮助。我就是无法让这段代码将HTML表单中的数据插入MySQL。插入的行始终没有任何数据。完全空了。让我知道你的想法

PS:MySql还有2个字段，我还没有使用，这些文件都托管在Pythonywhere上

HTML（仅表格）：

---

您正在错误地创建和使用模型类

在您的案例中，实际上根本不需要

\uuuu init\uuuu

。此外，您在构造函数中做了一些不正确的事情，关于Python类的简短复习教程在这里不会有什么坏处

以下是您可以遵循的用户模型模式

您不需要定义

\uuuu init\uuuu

class User(db.Model):
    """Users"""

    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    first_name = db.Column(db.String(25), nullable=False)
    last_name = db.Column(db.String(25), nullable=False)
    image_url = db.Column(db.Text, default=DEFAULT_IMG_URL)
    email = db.Column(db.String(45), unique=True, nullable=False)
    password = db.Column(db.String(128), unique=False, nullable=False)

    def __repr__(self):
        return f'<User id:{self.id} first_name:{self.first_name} last_name:{self.last_name} image_url:%.8s' % self.image_url

    def get_full_name(self):
        return f'{self.first_name} = {self.last_name}'

---

完美的非常感谢。我不得不添加“table_args={'extend_existing'：True}”，因为在这个问题中没有粘贴另一个类（login）。帮了很多忙！

from datetime import datetime
from flask import Flask, redirect, render_template, request, url_for, session
from flask_login import current_user, login_required, login_user, LoginManager, logout_user, UserMixin
from flask_migrate import Migrate
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import check_password_hash
from flask import session as login_session


@app.route("/register/", methods=["GET", "POST"])
    def register_user():
    if request.method == "GET":
        return render_template("register.html")

    else:

        User_Data = Reg_User(firstname=request.form["firstname"],lastname=request.form["lastname"],email=request.form["email"],password_hash=request.form["password"])#,groups="freeuser")
        db.session.add(User_Data)
        db.session.commit()

        return redirect(url_for('login'))



class Reg_User(db.Model):

    __tablename__ = 'users'

    def __init__(self, firstname, lastname, email, password_hash):#, groups):

        id = db.Column(db.Integer, primary_key=True)
        firstname = db.Column(db.String(20), unique=False, nullable=False)
        lastname = db.Column(db.String(45), unique=False, nullable=False)
        email = db.Column(db.String(45), unique=True, nullable=False)
        password_hash = db.Column(db.String(128), unique=False, nullable=False)


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

+--------------------------------------------------------------------------

|  id  |  username  |  password_hash  |  firstname  |  lastname  |  email  |   groups  |  regtime  |

+--------------------------------------------------------------------------

|  43  |     NULL     |          NULL           |     NULL      |     NULL     |  NULL  |   NULL   |  2019-01-09 22:00:56 |

|  44  |     NULL     |          NULL           |     NULL      |     NULL     |  NULL  |   NULL   |  2019-01-09 22:55:09 |

|  45  |     NULL     |          NULL           |     NULL      |     NULL     |  NULL  |   NULL   |  2019-01-09 23:04:15 |

|  46  |     NULL     |          NULL           |     NULL      |     NULL     |  NULL  |   NULL   |  2019-01-09 23:10:32 |

class User(db.Model):
    """Users"""

    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    first_name = db.Column(db.String(25), nullable=False)
    last_name = db.Column(db.String(25), nullable=False)
    image_url = db.Column(db.Text, default=DEFAULT_IMG_URL)
    email = db.Column(db.String(45), unique=True, nullable=False)
    password = db.Column(db.String(128), unique=False, nullable=False)

    def __repr__(self):
        return f'<User id:{self.id} first_name:{self.first_name} last_name:{self.last_name} image_url:%.8s' % self.image_url

    def get_full_name(self):
        return f'{self.first_name} = {self.last_name}'

@app.route("/register/", methods=["GET", "POST"])
    def register_user():
    if request.method == "GET":
        return render_template("register.html")

    else:
        first_name = request.form.get('first_name')
        last_name = request.form.get('last_name') 
        email = request.form.get('email')
        password = request.form.get('password')

        # hash your password, this is a separate topic
        hashed = bcrypt.generate_password_hash(password).decode('utf-8')

        user = User(first_name=first_name, last_name=last_name, email=email, password=hashed)

        db.session.add(user)
        db.session.commit()

        return redirect(url_for('login'))