企业级云原生数据库限时秒杀

// 使用React框架优化页面加载速度
import React, { lazy, Suspense } from 'react';

const Home = lazy(() => import('./Home'));

function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <Home />
    </Suspense>
  );
}

export default App;

# 使用Python的Flask框架和SQLAlchemy进行并发控制
from flask import Flask, request
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.exc import IntegrityError

app = Flask(__name__)
engine = create_engine('sqlite:///example.db')
Base = declarative_base()
Session = sessionmaker(bind=engine)

class Product(Base):
    __tablename__ = 'products'
    id = Column(Integer, primary_key=True)
    name = Column(String, unique=True)

@app.route('/purchase', methods=['POST'])
def purchase():
    session = Session()
    try:
        product = session.query(Product).filter_by(id=request.json['product_id']).with_for_update().first()
        if product.stock > 0:
            product.stock -= 1
            session.commit()
            return {'status': 'success'}, 200
        else:
            return {'status': 'out of stock'}, 400
    except IntegrityError:
        session.rollback()
        return {'status': 'error'}, 500
    finally:
        session.close()

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