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[问与答] nextjs 全局变量求解答

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在业务代码中 import AppDataSource 操作数据库，但是有时候页面切换的时候会打印========== connection ========= 和 ============ db connected =========，意味着这个文件会被多次加载。如何做到全局变量只初始化一次？还有一个问题是 nextjs 有没有入口文件的概念，我想等服务端准备好了再提供页面访问服务

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