Переработана и протестирована регистрация

db_routing.py

@@ -0,0 +1,25 @@
+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+
+
+app = Flask(__name__, static_folder='static', template_folder='templates')
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///data.db'
+db = SQLAlchemy(app)
+
+
+class User(db.Model):
+    __tablename__ = 'users'
+    UserID = db.Column(db.Integer, primary_key=True)
+    UserName = db.Column(db.String(80), unique=True, nullable=False)
+    UserPassw = db.Column(db.String(120), nullable=False)
+
+
+def add_user(user_name, passw_hash):
+    if not find_user(user_name):
+        new_user = User(UserName=user_name, UserPassw=passw_hash)
+        db.session.add(new_user)
+        db.session.commit()
+
+
+def find_user(user_name):
+    return User.query.filter_by(UserName=user_name).first()