JPA - Persistence Examples

    public static void main(String[] args) {
        EntityManagerFactory emf =
                Persistence.createEntityManagerFactory("example-unit");
        try {
            persistEntity(emf);
            runNativeQueries(emf);
            loadEntity(emf);
        } finally {
            emf.close();
        }
    }

    public static void main(String[] args) {
        EntityManagerFactory emf =
                Persistence.createEntityManagerFactory("example-unit");
        try {
            persistEntities(emf);
            displayEntities(emf);
        } finally {
            emf.close();
        }
    }

    static void printLoadState(String msg, Employee employee) {
        System.out.printf("-- %s --%n", msg);
        PersistenceUtil pu = Persistence.getPersistenceUtil();
        boolean employeeLoaded = pu.isLoaded(employee);
        System.out.printf("employee loaded: %s%n", employeeLoaded);
        boolean phonesLoaded = pu.isLoaded(employee, "phones");
        System.out.printf("  phones loaded: %s%n", phonesLoaded);
        System.out.println("---------------");
    }