Create Main.java

Author: witold-swierzy

data-platform/autonomous-database/autonomous-json/BasicMongoDemo/java/com.oracle/Main.java

@@ -0,0 +1,62 @@
+package com.oracle;
+
+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.Filters;
+import com.mongodb.client.model.ReplaceOptions;
+import com.mongodb.client.model.UpdateOptions;
+import com.mongodb.client.model.Updates;
+import org.bson.Document;
+import org.bson.conversions.Bson;
+
+//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
+// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+public class Main {
+    public static void main(String[] args) {
+        MongoClient client;
+        MongoDatabase db;
+        String connectString = System.getenv("DB_URI");
+        String dbName = System.getenv("DB_NAME");
+
+        try {
+            client = MongoClients.create(connectString);
+            db = client.getDatabase(dbName);
+
+            System.out.println("Connected!");
+
+            MongoCollection<Document> colors = db.getCollection("colors");
+            colors.deleteMany(new Document());
+            System.out.println("All documents form colors collection deleted.");
+
+            colors = db.getCollection("colors");
+            Document d = new Document("name","black");
+            d.append("_id","0001");
+            colors.insertOne(d);
+            d = new Document("name","yellow");
+            colors.insertOne(d);
+            d = new Document("name","green");
+            colors.insertOne(d);
+            System.out.println("Inserts done.");
+
+            Bson filter = Filters.eq("_id", "0001");
+            Bson update = Updates.set("name","orange");
+            UpdateOptions options = new UpdateOptions().upsert(true);
+            System.out.println(colors.updateOne(filter,update,options));
+            System.out.println("UPDATE with UPSERT done.");
+
+            ReplaceOptions replace = new ReplaceOptions().upsert(true);
+            d = new Document("_id", "0001");
+            d.append("name","white");
+            colors.replaceOne(filter,d,replace);
+            System.out.println("Replace done.");
+
+            System.out.println("Printing all documents from colors collection");
+            Bson f = Filters.empty();
+            colors.find(f).forEach(doc -> System.out.println(doc.toJson()));
+
+        }
+        catch (Exception e) {e.printStackTrace();}
+    }
+}