Hibernate Pagination

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Hibernate Pagination

In this tutorial we will discuss concept of pagination in hibernate.

In this tutorial we will discuss concept of pagination in hibernate.

Hibernate Pagination

In this tutorial we will discuss concept of pagination in hibernate.

Pagination in Hibernate :

Pagination is used where you have to display large amount of result. It is tough to display all the record into a single page.
For convenient and better display hibernate provides concept of pagination. In pagination large result set is divided into a number of pages and at a time you can fetch one page.
For this, just set start position and page size. Use "order by" clause to sort result dataset.

Code :

String hql = "SELECT stud.roll, stud.name, stud.course FROM Student stud";
Query query = session.createQuery(hql);
query.setFirstResult(start);
query.setMaxResults(end);

setFirstResult(int arg0) : sets the starting point of your table record. It is contained in Query org.hibernate.Query.setFirstResult(int arg0)
It takes one int type argument.
setMaxResults():  sets the maximum result into your single page. It is defined in Query org.hibernate.Query.setFirstResult(int arg0).
It takes one int type argument.

Example : Here we are selecting record of student and displaying it by using pagination concept.

main class code :

package net.roseindia.main;

import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.roseindia.table.Student;
import net.roseindia.util.HibernateUtil;

import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

public class MainClazz {

public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
int start = 0;
int end = 5;
String hql = "SELECT stud.roll, stud.name, stud.course FROM Student stud order by stud.roll";
Query query = session.createQuery(hql);
query.setFirstResult(start);
query.setMaxResults(end);
query.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP);

List objectList = query.list();
Iterator iterator = objectList.iterator();
System.out.println("RollNo.\t Name \t Course");
while (iterator.hasNext()) {
Map map = (Map) iterator.next();
System.out.print(map.get("0"));
System.out.print("\t" + map.get("1"));
System.out.print("\t" + map.get("2"));
System.out.println();
}

session.close(); // session is closed
}

}

Output :

Hibernate: select student0_.roll_no as col_0_0_, student0_.name as col_1_0_, student0_.course as col_2_0_ from student student0_ limit ?
RollNo.  Name    Course
1        Rondy   java
3        Johny   unix
4        Roxi    Hibernate
5        Johny   Hibernate
6        johny   C

Click here to download complete source code

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