JPQL, how query to find repeatation of objects per day? - google-app-engine

Question

I have a trending application. The app gets list of trends from Tweeter every an hour and put it in data store (without checking for duplication based on name). Therefore, for a particular word such as "Thaipusam" I'll have so many objects that their only difference is date which has been calculated by long date = new Date().getTime(); whenever background process want to push it to data store.
Each object is like this:
{
id: 4749890231992320,
name: "Thaipusam",
url: "http://twitter.com/search?q=Thaipusam",
query: "Thaipusam",
location: "Kuala Lumpur",
woeid: 1154781,
date: 1389865326440
}
Since I have over 5000 objects in the datastore, I need to know how many times each object searched per day.
What is the best/efficient practice to calculate/query repeatation per day?

Answer 1

I have no idea it's the most efficient way or not but I did this in my servlet and result is satisfactory:
private static final long MILLIS_PER_DAY = 24 * 60 * 60 * 1000;
private static final long MILLIS_PER_WEEK = 7 * MILLIS_PER_DAY;
private static final long MILLIS_PER_MONTH = 30 * MILLIS_PER_DAY;
private static final long MILLIS_PER_YEAR = 365 * MILLIS_PER_DAY;
private static final String QUERY_PER_PERIOD = "SELECT m.date FROM TwitterTrendsJPA As m WHERE m.name = :keyword1 AND m.date >= :keyword2";
in doGet() method:
long currentTime = new Date().getTime();
long last24hours = currentTime - MILLIS_PER_DAY;
long last7days = currentTime - MILLIS_PER_WEEK;
long last30days = currentTime - MILLIS_PER_MONTH;
long last365days = currentTime - MILLIS_PER_YEAR;
#SuppressWarnings("unchecked")
List<Long> statList;
Statistic statistic = new Statistic();
Query query1 = em.createQuery(QUERY_PER_PERIOD);
query1.setParameter("keyword1", p2);
query1.setParameter("keyword2", last24hours);
statList = (List<Long>) query1.getResultList();
statistic.setPerDay(statList);
Query query2 = em.createQuery(QUERY_PER_PERIOD);
query2.setParameter("keyword1", p2);
query2.setParameter("keyword2", last7days);
statList = (List<Long>) query2.getResultList();
statistic.setPerWeek(statList);
Query query3 = em.createQuery(QUERY_PER_PERIOD);
query3.setParameter("keyword1", p2);
query3.setParameter("keyword2", last30days);
statList = (List<Long>) query3.getResultList();
statistic.setPerMonth(statList);
Query query4 = em.createQuery(QUERY_PER_PERIOD);
query4.setParameter("keyword1", p2);
query4.setParameter("keyword2", last365days);
statList = (List<Long>) query4.getResultList();
statistic.setPerYear(statList);
and Statistic class is like this:
private final class Statistic {
private List<Long> perDay;
private List<Long> perWeek;
private List<Long> perMonth;
private List<Long> perYear;
public List<Long> getPerDay() {
return perDay;
}
public void setPerDay(List<Long> perDay) {
this.perDay = perDay;
}
public List<Long> getPerWeek() {
return perWeek;
}
public void setPerWeek(List<Long> perWeek) {
this.perWeek = perWeek;
}
public List<Long> getPerMonth() {
return perMonth;
}
public void setPerMonth(List<Long> perMonth) {
this.perMonth = perMonth;
}
public List<Long> getPerYear() {
return perYear;
}
public void setPerYear(List<Long> perYear) {
this.perYear = perYear;
}
}