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JPA Max Function

In this section, you will learn how to develop a jpa max function.

JPA Max Function


In this section, you will learn how to develop a jpa max function. JPA max function retrieves data from the database table field which is maximum of given field.

JPA Max Function:

Query query=em.createQuery
("SELECT p FROM Product p WHERE p.price <
(SELECT MAX(p.price) FROM p)"

This query retrieves all product which is less than maximum price of product.

Developing this application, you need the following artifacts:

  1. Database Table: product
  2. Model Class:
  3. Main Class:

Database Table: product

CREATE TABLE `product` ( 
`id` int(11) NOT NULL auto_increment, 
`itemName` varchar(50) NOT NULL, 
`price` double NOT NULL, 

Model Class:


package roseindia;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

* @author Administrator
public class Product {

private int id;
* @return the id
public int getId() {
return id;

* @param id the id to set
public void setId(int id) { = id;

private String itemName;
* @return the itemName
public String getItemName() {
return itemName;

* @param itemName the itemName to set
public void setItemName(String itemName) {
this.itemName = itemName;

private double price;
* @return the price
public double getPrice() {
return price;

* @param price the price to set
public void setPrice(double price) {
this.price = price;


Main Class:

package roseindia;

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

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.Query;

* @author Administrator
public class JPAMaxFunction {

* @param args
public static void main(String[] args) {
// TODO Auto-generated method stub

EntityManagerFactory emf=Persistence.createEntityManagerFactory("jpa");
EntityManager em=emf.createEntityManager();
EntityTransaction entr=em.getTransaction();
Query query=em.createQuery("SELECT p FROM Product p WHERE p.price < (SELECT MAX(p.price) FROM p)");
List pList=query.getResultList();
Iterator pIterator=pList.iterator();
Product pro=(Product);
System.out.print("Item name:"+pro.getItemName());
System.out.print(" Price:"+pro.getPrice());


log4j:WARN No appenders could be found for logger

log4j:WARN Please initialize the log4j system properly.

Hibernate: select as id1_, product0_.itemName
as itemName1_, product0_.price as price1_ from product
product0_ where product0_.price<(select MAX(product0_.price)
from product product0_)

Item name:Pen Price:225.0

Item name:Book Price:625.0

Item name:T.V. Price:6000.0



Posted on: March 17, 2005 If you enjoyed this post then why not add us on Google+? Add us to your Circles

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