persistence-modules/java-mongodb/src/main/java/com/baeldung/MongoBsonExample.java - master - NikolayIvkin/tutorials1

persistence-modules/java-mongodb/src/main/java/com/baeldung/MongoBsonExample.java

79 строк2 KB

Eric Martin

Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

01 ноя 2019, 04:43

01 ноя 2019, 04:433225470

package com.baeldung;

import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MongoBsonExample
{
   public static void main(String[] args)
   {
      //
      // 4.1 Connect to cluster (default is localhost:27017)
      //

      MongoClient mongoClient = MongoClients.create();
      MongoDatabase database = mongoClient.getDatabase("myDB");
      MongoCollection<Document> collection = database.getCollection("employees");

      //
      // 4.2 Insert new document
      //

      Document employee = new Document()
                             .append("first_name", "Joe")
                             .append("last_name", "Smith")
                             .append("title", "Java Developer")
                             .append("years_of_service", 3)
                             .append("skills", Arrays.asList("java", "spring", "mongodb"))
                             .append("manager", new Document()
                                                   .append("first_name", "Sally")
                                                   .append("last_name", "Johanson"));
      collection.insertOne(employee);

      //
      // 4.3 Find documents
      //


      Document query = new Document("last_name", "Smith");
      List results = new ArrayList<>();
      collection.find(query).into(results);

      query =
         new Document("$or", Arrays.asList(
            new Document("last_name", "Smith"),
            new Document("first_name", "Joe")));
      results = new ArrayList<>();
      collection.find(query).into(results);

      //
      // 4.4 Update document
      //

      query = new Document(
         "skills",
         new Document(
            "$elemMatch",
            new Document("$eq", "spring")));
      Document update = new Document(
         "$push",
         new Document("skills", "security"));
      collection.updateMany(query, update);

      //
      // 4.5 Delete documents
      //

      query = new Document(
         "years_of_service",
         new Document("$lt", 0));
      collection.deleteMany(query);
   }
}