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javamongodbmongodb-java

How to delete all documents in mongodb collection in java

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

Solution

  • To remove all documents use the BasicDBObject or DBCursor as follows:

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

BasicDBObject document = new BasicDBObject();

// Delete All documents from collection Using blank BasicDBObject
collection.deleteMany(document);

// Delete All documents from collection using DBCursor
DBCursor cursor = collection.find();
while (cursor.hasNext()) {
    collection.remove(cursor.next());
}