Orient DB Example

Main.java

public class Main {

    private OServer server;

    public void exec() throws Exception {
        OObjectDatabaseTx db = new OObjectDatabaseTx("memory:persondb").create();
        db.getEntityManager().registerEntityClass(Person.class);

        Person nanoha = db.newInstance(Person.class);
        nanoha.setName("Nanoha");
        nanoha.setAge(19);
        db.save(nanoha);

        Person fate = db.newInstance(Person.class, "Fate", 10);
        db.save(fate);

        System.out.println("--");

        System.out.println("show all members.");
        for (Person person : db.browseClass(Person.class)) {
            System.out.printf("Name:%s, Age:%d", person.getName(), person.getAge());
            System.out.println();
        }

        System.out.println("--");

        System.out.println("show members under 12");
        List<Person> result = db.query(
                new OSQLSynchQuery<>("select * from Person where age > 12"));
        result.stream().forEach(p -> {
            System.out.printf("Name:%s, Age:%d", p.getName(), p.getAge());
            System.out.println();
        });
        db.close();
    }

    public void shutdown() throws Exception {
        server.shutdown();
    }

    public void start() throws Exception {
        server = OServerMain.create()
                .startup(getClass().getClassLoader().getResourceAsStream("orientdb-server-config.xml"))
                .activate();
    }

    public static void main(String[] args) throws Exception {
        Main main = new Main();
        main.start();
        main.exec();
        main.shutdown();
    }
}