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Example class for BAEL-4888 (#11728) 

code used to illustrate the article about retrieving the MongoDB ID
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sebx59 2022-01-29 06:58:08 +01:00 committed by GitHub
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persistence-modules/java-mongodb/src/main/java/com/baeldung/mongo/objectid/RetrieveIdExample.java Normal file
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package com.baeldung.mongo.objectid;
import java.util.Date;
import org.bson.Document;
import org.bson.types.ObjectId;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
public class RetrieveIdExample {
public static void main(String[] args) {
try ( MongoClient mongoClient = new MongoClient("localhost", 27017) ) {
MongoDatabase database = mongoClient.getDatabase("myMongoDb");
MongoCollection<Document> collection = database.getCollection("example");
// Create document with user-generated ID
ObjectId generatedId = new ObjectId();
System.out.println(generatedId.toString());
Document document = new Document();
document.put("_id", generatedId);
document.put("name", "Shubham");
document.put("company", "Baeldung");
collection.insertOne(document);
// Check that the ID of the document is still the one we set
System.out.println(document.getObjectId("_id").equals(generatedId));
// Create a second document by injecting the ID in the constructor
ObjectId generatedId2 = ObjectId.get();
Document document2 = new Document("_id", generatedId2);
document2.put("name", "Shubham");
document2.put("company", "Baeldung");
collection.insertOne(document2);
Date creationDate = generatedId.getDate();
System.out.println(creationDate);
int timestamp = generatedId.getTimestamp();
} catch (Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}