Java實現的開源RDBMS+NoSQL數據庫：OhmDB

讓Java開發者在一個JAR中，就能夠用到RDBMS和NoSQL兩者的優點。

import com.ohmdb.api.*;

class Person { public String name; public int age; }
public class Main {
   public static void main(String[] args) {
      Db db = Ohm.db("ohm.db");
      Table<Person> persons = db.table(Person.class);
      Person $p = persons.queryHelper();

  Person p1 = new Person();
  p1.name = "Niko";
  p1.age = 30;
  long id = persons.insert(p1);
  Person p2 = persons.get(id);

  persons.createIndexOn($p.age);
  Person[] adults = persons.where($p.age).gte(18).get();

  db.shutdown();

}
}</pre> 
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