From c69343c8537443d278ff8fa14da586efb93ff3d8 Mon Sep 17 00:00:00 2001
From: sebx59 <sebx59@users.noreply.github.com>
Date: Sat, 29 Jan 2022 06:58:08 +0100
Subject: [PATCH] Example class for BAEL-4888 (#11728)

code used to illustrate the article about retrieving the MongoDB ID
---
 .../mongo/objectid/RetrieveIdExample.java     | 57 +++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 persistence-modules/java-mongodb/src/main/java/com/baeldung/mongo/objectid/RetrieveIdExample.java

diff --git a/persistence-modules/java-mongodb/src/main/java/com/baeldung/mongo/objectid/RetrieveIdExample.java b/persistence-modules/java-mongodb/src/main/java/com/baeldung/mongo/objectid/RetrieveIdExample.java
new file mode 100644
index 0000000000..74279bbfcd
--- /dev/null
+++ b/persistence-modules/java-mongodb/src/main/java/com/baeldung/mongo/objectid/RetrieveIdExample.java
@@ -0,0 +1,57 @@
+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();
+        }
+    }
+
+}