문서 업데이트

// Updates the first document that matches a query filter by using the Java driver
package org.example;
import org.bson.Document;
import org.bson.conversions.Bson;
import com.mongodb.MongoException;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.UpdateOptions;
import com.mongodb.client.model.Updates;
import com.mongodb.client.result.UpdateResult;
import static com.mongodb.client.model.Filters.gt;
public class Update {
    public static void main(String[] args) {
        // Replace the uri string with your MongoDB deployment's connection string
        String uri = "<connection string uri>";
        try (MongoClient mongoClient = MongoClients.create(uri)) {
            MongoDatabase database = mongoClient.getDatabase("sample_mflix");
            MongoCollection<Document> collection = database.getCollection("movies");
            // Instructs the driver to insert a new document if none match the query
            UpdateOptions options = new UpdateOptions().upsert(true);
            Document updateOneQuery = new Document().append("title",  "Cool Runnings 2");
            // Creates instructions to update the values of three document fields
            Bson updateOneUpdates = Updates.combine(
                    Updates.set("runtime", 99),
                    Updates.addToSet("genres", "Sports"),
                    Updates.currentTimestamp("lastUpdated"));
            // Updates the first document that has a "title" value of "Cool Runnings 2"
            UpdateResult result = collection.updateOne(updateOneQuery, updateOneUpdates, options);
            // Prints the number of updated documents and the upserted document ID, if an upsert was performed
            System.out.println("Number of documents updated - update one: " + result.getModifiedCount());
            System.out.println("Upserted document ID: " + result.getUpsertedId());
            Bson updateManyQuery = gt("num_mflix_comments", 50);
            // Creates instructions to update the values of two document fields
            Bson updateManyUpdates = Updates.combine(
                    Updates.addToSet("genres", "Frequently Discussed"),
                    Updates.currentTimestamp("lastUpdated"));
            // Updates documents that have a "num_mflix_comments" value over 50
            UpdateResult result = collection.updateMany(updateManyQuery, updateManyUpdates);
            // Prints the number of updated documents
            System.out.println("\nNumber of documents updated - update many: " + result.getModifiedCount());
        }
    }
}

// Replaces the first document that matches a filter by using the Java driver
package org.example;
import static com.mongodb.client.model.Filters.eq;
import org.bson.Document;
import org.bson.conversions.Bson;
import com.mongodb.MongoException;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.ReplaceOptions;
import com.mongodb.client.result.UpdateResult;
public class ReplaceOne {
    public static void main(String[] args) {
        // Replace the uri string with your MongoDB deployment's connection string
        String uri = "<connection string uri>";
        try (MongoClient mongoClient = MongoClients.create(uri)) {
            MongoDatabase database = mongoClient.getDatabase("sample_mflix");
            MongoCollection<Document> collection = database.getCollection("movies");
            Bson query = eq("title", "Music of the Heart");
            // Creates a new document containing "title" and "fullplot" fields
            Document replaceDocument = new Document().
                    append("title", "50 Violins").
                    append("fullplot", " A dramatization of the true story of Roberta Guaspari who co-founded the Opus 118 Harlem School of Music");
            // Instructs the driver to insert a new document if none match the query
            ReplaceOptions opts = new ReplaceOptions().upsert(true);
            // Replaces the first document that matches the filter with a new document
            UpdateResult result = collection.replaceOne(query, replaceDocument, opts);
            // Prints the number of modified documents and the upserted document ID, if an upsert was performed
            System.out.println("Modified document count: " + result.getModifiedCount());
            System.out.println("Upserted id: " + result.getUpsertedId());
        // Prints a message if any exceptions occur during the operation
        } catch (MongoException me) {
            System.err.println("Unable to replace due to an error: " + me);
        }
    }
}