List<Subscription> ls = (List<Subscription>) sq.execute(user.getKey(),user.getLastEmail());
//fetch new subscriptions
for(Subscription sub : ls){
//fetch entries
Query qEntry = pm.newQuery(BlogEntry.class);
qEntry.setFilter("blogKey == bk && pubDate > date");
qEntry.declareParameters("com.google.appengine.api.datastore.Key bk, java.util.Date date");
//fetch entries
List<BlogEntry> entries = (List<BlogEntry>) qEntry.execute(sub.getBlogKey(),user.getLastEmail());