如何在graphql中获取mongodb结果

npm install graphql graphql-tools mongodb

const MongoClient = require('mongodb').MongoClient;

const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

async function connect() {
  try {
    await client.connect();
    console.log('Connected to MongoDB');
    return client.db('your_database_name');
  } catch (error) {
    console.error('Error connecting to MongoDB:', error);
  }
}

module.exports = { connect };

const { makeExecutableSchema } = require('graphql-tools');

const typeDefs = `
  type Query {
    users: [User]
  }

  type User {
    id: ID!
    name: String!
    email: String!
  }
`;

const resolvers = {
  Query: {
    users: async (_, __, { db }) => {
      const usersCollection = db.collection('users');
      const users = await usersCollection.find().toArray();
      return users;
    },
  },
};

const schema = makeExecutableSchema({ typeDefs, res伪装者olvers });

module.exports = schema;

const express = require('express');
const { graphqlHTTP } = require('express-graphql');
const { connect } = require('./db');
const schema = require('./schema');

const app = express();

app.use(
  '/graphql',
  graphqlHTTP(async (req, res) => {
    const db = await connect();
    return {
      schema,
      context: { db },
      graphiql: true,
    };
  })
);

app.listen(4000, () => {
  console.log('Server is running on port 400't);
});

node server.js

query {
  users {
    id
    name
    email
  }
}