如何使用节点js在mongodb中动态创建collections

Question

I have huge record to store for each company, one company can contain 200k records. how can we create a dynamic collection for each company with company name to avoid filtration in mongodb.

Answer 1

const MongoClient = require('mongodb').MongoClient;
const url = "mongodb://******";
const client = new MongoClient(url, { useNewUrlParser: true });
const dbname='******';
client.connect(err => {
  const db=client.db(dbname);
  const promises = ['Company1','Company2','Company3'].map(name => db.createCollection(name))
  return Promise.all(promises)
    .then(() => {
      client.close()
    })
    .catch(err=>{
        console.log(err)
    })
})

I suggest promise,async,etc.. But if you don't use it, this would create the collections:

client.connect(err => {
  const db=client.db(dbname);
  const companies = ['Company1','Company2','Company3']
  companies.forEach(name=>{
    db.createCollection(name)
  })
})