Syntax error How to update an existing document in MongoDB collection using Java?

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: 2020-04-10T07:36:22+05:30

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