In this section, you will learn how to retrieve data from database using JPA. Create a "JPARead.java" file and follows the following steps to reading data from database.

JPA read data from database example

     

In this section, you will learn how to retrieve data from database using JPA. Create a "JPARead.java" file and follows the following steps to reading data from database.

Create "JPARead" class file.



Put the following text in "JPARead.java" file.



JPARead.java

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

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 JPARead {
public static void main(String arg[]){
EntityManagerF




					actory emf=Persistence.createEntityManagerFactory("netjpa");
EntityManager em=emf.createEntityManager();
try{
EntityTransaction entr=em.getTransaction();
entr.begin();
Query query=em.createNamedQuery("readAllRecords");
List stList=query.getResultList();
Iterator stIterator=stList.iterator();
while(stIterator.hasNext()){
Student stu=(Student)stIterator.next();
System.out.print("Name:"+stu.getSname());
System.out.print(" Roll:"+stu.getSroll());
System.out.print(" Course:"+stu.getScourse());
System.out.println();
}
entr.commit();
}
catch(Exception e){
System.out.println(e.getMessage());
}
finally{
em.close();
}
}
}

Run it and get the following output:

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