@Override
    public Struct toConnectStruct() {
        Struct struct = new Struct(CONNECT_SCHEMA);
        struct.put("author", this.getAuthor());
        struct.put("title", this.getTitle());
        struct.put("genre", this.getGenre());
        struct.put("price", this.getPrice());
        if (null!= this.getPubDate()) {
            struct.put("pub_date", this.getPubDate().toGregorianCalendar(TimeZone.getTimeZone("UTC"), null, null).getTime());
        } else {
            struct.put("pub_date", null);
        }
        struct.put("review", this.getReview());
        struct.put("id", this.getId());
        return struct;
    }