如何在 mongodb 中创建多个 collections？

Question

I currently have a users collection. I want to create a logs collection and join them together. Right now I can create the users collection through.createCollection. But is it possible to create multiple collections in one go? Or do I have to do it through two separate.createCollection operations?

Answer 1

To create a collection https://www.tutorialspoint.com/mongodb/mongodb_create_collection.htm

To do a join https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/

Answer 2

You can make a list of collection names and then loop through it and call db.createCollection operations on mongo shell easily:

eg:

> var collectionList = ["A", "B"];
> collectionList.forEach(function(collectionName) {db.createCollection(collectionName)})

After completion of the above command, just check the list of all collections:

> show collections
A
B

For details about the create collection visit the official documentation createCollection

And for reference to other collections, please check the documentation of DBRef