mongodb和expressjs的最佳做法

Question

I want to know how to handle mongo connections with express.

My questions are:

Is it a good idea create a middleware to handle every request and before execute it, connect to mongo?

Is it a good idea create a middleware to handle every request and after make response, close mongo connection?

Answer 1

Best practice is to call mongoose.connect during your application's startup and just leave it open. That call creates a connection pool that is shared across all Mongoose models, by default.

The default pool size is 5, but you can tweak that in your call's options :

const options = {
    poolSize: 10
};
mongoose.connect('mongodb://localhost/test', options);