How to fetch hibernate query result as associative array of list or hashmap
I am developing an application in struts 2 and hibernate 3.
I have 3 tables
- Inspection
- InspectionMission
- Timeline
Inspection
is associated with InspectionMission
and InspectionMission
is associated with Timeline
.
Now I have following problem. I have written following query in HQL
public List getQuartewiseInspectionList(){
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
Query q = session.createQuery(
"select count(i.inspectionId) as tot_inspections,t.year,t.quarter" +
" From Inspection as i " +
" inner join i.inspectionMission as im inner join im.timeline as t" +
" GROUP by t.year,t.quarter");
return q.list();
}
I want to fetch result as following
result[0][tot_inspections] = "6"
result[0][year] = "2009";
result[0][quarter] = "Q2";
result[1][tot_inspections] = "3"
result[1][year] = "2009";
result[1][quarter] = "Q3";
and so on so that I can display it in jsp struts as follows:
In JSP I have written following code
<table border="1">
<s:iterator value="result" status="status">
<tr class="<s:if test="#status.even">even</s:if><s:else>odd</s:else>">
<td class="nowrap"><s:property value="tot_inspections" /></td>
<td class="nowrap"><s:property value="year" /></td>
<td class="nowrap"><s:property value="quarter" /></td>
</tr>
</s:iterator>
</table>
Can anyone here help me?
Solution 1:
You have to use the "new map" syntax (Hibernate Reference paragraph 14.6)
select new map(count(i.inspectionId) as tot_inspections, t.year as year, t.quarter as quarter) from ...
The rest of the query is the same. This will return a list of maps, where the key is the alias of the "column".
Solution 2:
Another solution would be to define a data object just for displaying those results and let Hibernate create instances of those on the fly. This class would just need a matching constructor.
Example class (getters and fields omitted)
public class InspectionCount() {
// fields
public InspectionCount(int count, int year, int quarter) {
// initialize instance
}
// getters
}
The query would then look
select new InspectionCount(count(i.inspectionId), t.year, t.quarter)
from Inspection as i
inner join i.inspectionMission as im inner join im.timeline as t
group by t.year,t.quarter
As a result you would get a List
of InspectionCount
s.