MongoDB with the Java sync driver

Uses mongodb-driver-sync 5.14. The code is an ordinary application for the original database; nothing in it knows about MachNoSQL.

The only change

mongodb://app:secret@mongo.example.com:27017/shop?authSource=admin
mongodb://app:secret@machnosql.example.com:27017/shop?authSource=admin

The address comes from the environment variable MONGODB_URI, so switching to MachNoSQL changes configuration only.

Run

export MONGODB_URI='mongodb://app:secret@machnosql.example.com:27017/shop?authSource=admin'
mvn -q compile exec:java

Source

The program as it is kept and tested in the Mach Database NoSQL repository; highlighted lines read the connection setting.

src/main/java/example/App.java

// Orders example for MongoDB, unchanged on MachNoSQL.
package example;

import static com.mongodb.client.model.Accumulators.sum;
import static com.mongodb.client.model.Aggregates.group;
import static com.mongodb.client.model.Aggregates.sort;
import static com.mongodb.client.model.Filters.eq;
import static com.mongodb.client.model.Sorts.descending;
import static com.mongodb.client.model.Updates.inc;

import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import java.util.List;
import org.bson.Document;

public final class App {
    public static void main(String[] args) {
        try (MongoClient client = MongoClients.create(System.getenv("MONGODB_URI"))) {
            MongoCollection<Document> orders = client.getDatabase("shop").getCollection("orders");
            orders.deleteMany(new Document());
            orders.insertMany(List.of(
                new Document("customer", "ada").append("item", "keyboard").append("qty", 1).append("price", 49.0),
                new Document("customer", "ada").append("item", "mouse").append("qty", 2).append("price", 19.5),
                new Document("customer", "linus").append("item", "monitor").append("qty", 1).append("price", 199.0)));

            System.out.println(orders.find(eq("item", "mouse")).first());
            orders.updateOne(eq("item", "mouse"), inc("qty", 1));

            Document revenue = new Document("$multiply", List.of("$qty", "$price"));
            orders.aggregate(List.of(group("$customer", sum("revenue", revenue)), sort(descending("revenue"))))
                .forEach(row -> System.out.println(row.toJson()));
        }
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example.machnosql</groupId>
  <artifactId>mongodb-example</artifactId>
  <version>1.0</version>
  <properties>
    <maven.compiler.release>21</maven.compiler.release>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <exec.mainClass>example.App</exec.mainClass>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.mongodb</groupId>
      <artifactId>mongodb-driver-sync</artifactId>
      <version>5.14.0</version>
    </dependency>
  </dependencies>
</project>