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How to update an existing document in MongoDB collection using Java?
The update() method updates the values in the existing document.
Syntax
db.COLLECTION_NAME.update(SELECTIOIN_CRITERIA, UPDATED_DATA)
In Java, you can update a single document using the updateOne()method of the com.mongodb.client.MongoCollection interface. To this method, you need to pass the filter and values for the update.
Example
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Updates;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.bson.Document;
import com.mongodb.MongoClient;
public class UpdatingDocuments {
public static void main( String args[] ) {
// Creating a Mongo 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("myCollection");
//Preparing documents
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);
//Updating a document
collection.updateOne(Filters.eq("name", "Robert"), Updates.set("city", "Delhi"));
System.out.println("Document update successfully...");
FindIterable<Document> iterDoc = collection.find();
Iterator it = iterDoc.iterator();
while (it.hasNext()) {
System.out.println(it.next());
}
}
}Output
Document update successfully...
Document after update:
Document{{_id=5e86dd21e9b25f3460b1abe0, name=Ram, age=26, city=Hyderabad}}
Document{{_id=5e86dd21e9b25f3460b1abe1, name=Robert, age=27, city=Vishakhapatnam}}
Document{{_id=5e86dd21e9b25f3460b1abe2, name=Rhim, age=30, city=Delhi}}
Updated on: 10-Apr-2020
3K+ Views
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