MongoDB，如何创建一个空集合？

Question

How can I create an empty collection in MongoDB?

I've tried various things but they didn't work, that would be declaring it differently. What I know is that it should create a collection automatically when needed, but not sure.

However, you could technically create a collection and delete that what is inside.

This is an example on what I've tried:

function test() {
        db.createCollection("test", function() {});
        console.log("Collection has been created.")
};
test();

Answer 1

The following creates a collection for me and prints your log message:

function test() {
        db.createCollection("test");
        console.log("Collection has been created.")
};
test();

I removed the function(){} in your db.createCollection, maybe that caused your error?

Answer 2

In MongoDB no need to explicitly check if a collection already exists or not before doing any CRUD operations.

MongoDB will create the collections on the when it is required.