How to insert multiple document into a MongoDB collection using Java?

You can insert multiple documents into an existing collection in MongoDB using the insertMany() method.

Syntax

db.coll.insert(docArray)

Where,

• db is the database.

• coll is the collection (name) in which you want to insert the document

• docArray is the array of documents you want to insert.

Example

> use myDatabase()
switched to db myDatabase()
> db.createCollection(sample)
{ "ok" : 1 }
> db.test.insert([{name:"Ram", age:26, city:"Mumbai"}, {name:"Roja", age:28,
city:"Hyderabad"}, {name:"Ramani", age:35, city:"Delhi"}])
BulkWriteResult({
   "writeErrors" : [ ],
   "writeConcernErrors" : [ ],
   "nInserted" : 3,
   "nUpserted" : 0,
   "nMatched" : 0,
   "nModified" : 0,
   "nRemoved" : 0,
   "upserted" : [ ]
})

Using Java program

In Java, you can create insert a document into a collection using the insertMany() method of the com.mongodb.client.MongoCollection interface. This method accepts a list (object) congaing the documents you want to insert as a parameter.

Therefore to create a collection in MongoDB using Java program −

• Make sure you have installed MongoDB in your system

• Add the following dependency to its pom.xml file of your Java project.

<dependency>
   <groupId>org.mongodb</groupId>
   <artifactId>mongo-java-driver</artifactId>
   <version>3.12.2</version>
</dependency>

• Create a MongoDB client by instantiating the MongoClient class.

• Connect to a database using the getDatabase() method.

• Prepare the documents to be inserted.

• Get the object of the collection into which you want to insert the documents, using the getCollection() method.

• Create a List object adding all the created documents t it.

• Invoke the insertMany() method by passing the list object as a parameter.

Example

import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import java.util.ArrayList;
import java.util.List;
import org.bson.Document;
import com.mongodb.MongoClient;
public class InsertingMultipleDocuments {
   public static void main( String args[] ) {
      //Creating a MongoDB client
      MongoClient mongo = new MongoClient( "localhost" , 27017 );
      //Connecting to the database
      MongoDatabase database = mongo.getDatabase("myDatabase");
      //Creating a collection object
      MongoCollection<Document> collection =
      database.getCollection("sampleCollection");
      Document document1 = new Document("name", "Ram").append("age", 26).append("city", "Hyderabad");
      Document document2 = new Document("name", "Robert").append("age", 27).append("city", "Vishakhapatnam");
      Document document3 = new Document("name", "Rhim").append("age", 30).append("city", "Delhi");
      //Inserting the created documents
      List<Document> list = new ArrayList<Document>();
      list.add(document1);
      list.add(document2);
      list.add(document3);
      collection.insertMany(list);
      System.out.println("Documents Inserted");
   }
}

Output

Documents Inserted