DataAppLoader.java 文件源码

/**
 * @param args the command line arguments
 */
@PersistenceUnit
public static void main(String[] args) {
    System.out.println("Creating entity information...");
    EntityManager entityManager = Persistence.createEntityManagerFactory("DataAppLibraryPULocal").createEntityManager();
    EntityTransaction et = entityManager.getTransaction();
    et.begin();
    loadDiscountRate(entityManager);
    loadRegion(entityManager);
    loadRole(entityManager);
    loadTransmission(entityManager);
    loadProductType(entityManager);
    loadEngine(entityManager);
    loadProduct(entityManager);
    et.commit();


    EntityManager specialEntityManager = new InitialLoadEntityManagerProxy(entityManager);
    SalesSimulator simulator = new SalesSimulator(specialEntityManager);
    Calendar cal = Calendar.getInstance();
    int year = cal.get(Calendar.YEAR);
    cal.clear();
    cal.set(year-1, 0, 1, 0, 0, 0); // go back to begining of year, 3 years ago
    System.out.println("Creating historical data...");
    System.out.println("        This may take 5 to 15min depending on machine speed.");
    simulator.run(cal.getTime(), new Date());

    entityManager.close();
}