NameError: name db is not defined after restructuring using blueprints

Question

我尝试使用蓝图重新构建我的应用程序，完成后，我收到错误消息：“NameError: name 'db' is not defined”我不明白为什么会出现错误

这是我的 init.py 文件：初始化应用程序和数据库的位置

  import os
  from flask import Flask
    
    
    
    def create_app():
        app = Flask(__name__)
    
        from svc.base.routes import base
        from svc.admin.routes import admin
        from svc.auth.routes import auth
        from flaskext.mysql import MySQL
    
        db = MySQL(app)
        db.init_app(app)
    
        app.config['SECRET_KEY'] = 'MySecretKey'
        app.config['MYSQL_DATABSE_HOST'] = os.environ.get('DB_HOST')
        app.config['MYSQL_DATABASE_PORT'] = os.environ.get('DB_PORT')
        app.config['MYSQL_DATABASE_USER'] = os.environ.get('DB_USER')
        app.config['MYSQL_DATABASE_PASSWORD'] = os.environ.get('DB_PASSWORD')
        app.config['MYSQL_DATABASE_DB'] = os.environ.get('DB_DATABASE')
        app.register_blueprint(admin)
        app.register_blueprint(base)
        app.register_blueprint(auth)
    
        return app

我的routes.py文件重组后出现错误

    from flask import Blueprint, render_template
from .forms import LoginForm
from svc import create_app



auth = Blueprint('auth', __name__, template_folder='templates')


@auth.route('/login', methods=['POST', 'GET'])
def login():
    form=LoginForm()
    if form.validate_on_submit():
        email = form.email.data
        password = (form.password.data).encode('utf-8')

        cur = db.get_db().cursor()
        cur.execute("SELECT * FROM `user` WHERE `user_email` = %s",(form.email.data))
        user = cur.fetchone()
        cur.close()
        if user:
            username = user[1]
            role = user[5]
            session_id = user[0]
            if bcrypt.hashpw(password, (user[4].encode('utf-8'))) == (user[4].encode('utf-8')):
              session['loggedin'] = True
              session['id'] = session_id
              session['user'] = username
              session['role'] = role
              flash(f'Login Successful for {user[1]} {user[2]}', category='success')
              return redirect(url_for('account'))
            else:
                flash(f'Login Unsuccessful - Incorrect Password', category='danger')
        else:
            flash(f'Login Unsuccessful - Incorrect Email', category='danger')
    return render_template('login.html', title='Login',form=form)

Answer 1

flask-mysql 由运行 pip3 install flask-mysqlDB 安装。在你的 __init__.py 中，你需要从 flask_mysqldb 导入 MySQL 并初始化如下：

# Your previous imports
from flask_mysqldb import MySQL

db = MySQL()

def create_app():
    app = Flask(__name__)

    db.init_app(app)

    #

NameError: name db is not defined after restructuring using blueprints

NameError: name db is not defined after restructuring using blueprints

python

flask

flask-mysql