Hibernate Min() Function (Aggregate Functions)

In this section, we will show you, how to use the Min()
function. Hibernate supports multiple aggregate functions. When they are used in
HQL queries, they return an aggregate value ( such as avg(...),
sum(...), min(...), max(...) , count(*), count(...), count(distinct ...),
count(all...) ) calculated from property values of all objects satisfying
other query criteria.
Following is a aggregate function (min() function) with
their respective syntax.
min(
[ distinct | all ] object.property)
The Min() function aggregates the minimum value
of the given column.
Table Name: insurance
| ID |
insurance_name |
invested_amount |
investement_date |
| 2 |
Life Insurance |
25000 |
0000-00-00 00:00:00 |
| 1 |
Givan Dhara |
20000 |
2007-07-30 17:29:05 |
| 3 |
Life Insurance |
500 |
2005-10-15 00:00:00 |
| 4 |
Car Insurance |
2500 |
2005-01-01 00:00:00 |
| 5 |
Dental Insurance |
500 |
2004-01-01 00:00:00 |
| 6 |
Life Insurance |
900 |
2003-01-01 00:00:00 |
| 7 |
Travel Insurance |
2000 |
2005-02-02 00:00:00 |
Here is the java code to retrieve the minimum value of
"invested_amount" column from insurance table:
package roseindia.tutorial.hibernate;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateHQLMinFunction {
/**
* @Vinod Kumar
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Session sess = null;
try {
SessionFactory fact = new
Configuration().configure().buildSessionFactory();
sess = fact.openSession();
String SQL_QUERY = "select min
(investementAmount) from Insurance insurance";
Query query = sess.createQuery(SQL_QUERY);
List list = query.list();
System.out.println("Min
Invested Amount: " + list.get(0));
}
catch(Exception e){
System.out.println(e.getMessage());
}
}
}
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Download this
Code.
Output:
| log4j:WARN No appenders
could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select
min(insurance0_.invested_amount) as col_0_0_ from insurance insurance0_
Min Invested Amount: 500
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