Limit ResultSet Size 

The following example shows how to limit the results returned by a query. It is useful to implement server side pagination. Refer first example for the configuration and mapping. Hibernate org.hibernate.Query provides the following APIs,

public Query setFirstResult(int firstResult)
 - Set the first row to retrieve. If not set, 
   rows will be retrieved beginnning from row 0. 
 
public Query setMaxResults(int maxResults)
 - Set the maximum number of rows to retrieve. If not set, 
   there is no limit to the number of rows retrieved.

File Name  :   com/bethecoder/tutorials/hibernate/basic/tests/HQLMaxResultsTest.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.hibernate.basic.tests; import java.util.List; import org.hibernate.Query; import org.hibernate.Session; import com.bethecoder.tutorials.hibernate.basic.Company; import com.bethecoder.tutorials.hibernate.basic.util.HibernateUtil; public class HQLMaxResultsTest {   private static final int PAGE_SIZE = 4;      /**    * @param args    */   public static void main(String[] args) {     Session session = HibernateUtil.getSessionFactory().openSession();     session.beginTransaction();          String HQL_QUERY = "from Company comp";     Query query = session.createQuery(HQL_QUERY);          int curPage = 2;     /**      * Assuming page size of 4.      *       * Page1 (1, 2, 3, 4)      * Page2 (5, 6, 7, 8)      * Page3 (9, 10, 11, 12)      */     query.setFirstResult((curPage-1) * PAGE_SIZE); //set to start of page     query.setMaxResults(PAGE_SIZE);     List<Company> companies = query.list();         System.out.println("Selected row count : " + companies.size());          for (Company company : companies) {       System.out.println(company);     }          session.getTransaction().commit();     session.close();   }    }

Selected row count : 4
{ id = 5, name = ART, employeeCount = 67890, 
	projectCount = 850, address1 = add1112, address2 = add2223 }
{ id = 6, name = RNK, employeeCount = 98890, 
	projectCount = 8478, address1 = add1412, address2 = add27823 }
{ id = 7, name = AOQ, employeeCount = 97890, 
	projectCount = 4578, address1 = add17892, address2 = add2893 }
{ id = 8, name = BQO, employeeCount = 9778, 
	projectCount = 487, address1 = add1459, address2 = add2443 }