List authors = new ArrayList(NB_AUTHORS);
for(int i=0; i<10; i++) {
String id = i2s(i, length(NB_AUTHORS));
authors.add(new Author("FN_" + id, "LN_" + id, i));
}
pm.makePersistentAll(authors);
//Create books
for(int i=0; i<NB_BOOKS; i++) {
Book book = new Book("Book_" + i2s(i, length(NB_BOOKS)), i);
pm.makePersistent(book);