How to delete all documents in mongodb collection in java

Question

I want to delete all documents in a collection in java. Here is my code:

MongoClient client = new MongoClient("10.0.2.113" , 27017);
        MongoDatabase db = client.getDatabase("maindb");
        db.getCollection("mainCollection").deleteMany(new Document());

Is this the correct way to do this?

I am using MongoDB 3.0.2

Answer 1

Using API >= 3.0:

MongoClient mongoClient = new MongoClient("127.0.0.1" , 27017);
MongoDatabase db = mongoClient.getDatabase("maindb");
db.getCollection("mainCollection").deleteMany(new Document());

To drop the collection (documents and indexes) you still can use:

db.getCollection("mainCollection").drop();

see https://docs.mongodb.org/getting-started/java/remove/#remove-all-documents