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Hibernate Session Load

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This section contain description of Hibernate session load.

Hibernate Session Load

This section contain description of Hibernate session load.

Hibernate Session Load:

public Object load (Class theClass,Serializable id) throws HibernateException

load() method return proxy persistent instance with the given identifier instead of a real one. A proxy is a placeholder that loads the real object when first time it is accessed.
You should not use this method to determine if an instance exists (use get() instead).It is used to retrieve instance which exist.
If you will try to retrieve such record which does not exist then you will get an error.
load() method does not return null so it throws an unrecoverable exception if you try to load record which doesn't exist.

Example:  In this example we are using load() method to get student record whose roll number is 5.

Here is main class code-

package net.roseindia.main;

import net.roseindia.table.Student;
import net.roseindia.util.HibernateUtil;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

public class HibernateSessionLoad{
public static void main(String args[]) {
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = session.beginTransaction();
int roll = 5;

try {
Student student = (Student) session.load(Student.class, roll);
// Loading student record of roll=5)

System.out.println("RollNo. :" + student.getRoll());
System.out.println("Name :" + student.getName());
System.out.println("Course :" + student.getCourse());
session.close();
} catch (HibernateException e) {
e.printStackTrace();
}
}
}

Output:

Hibernate: select student0_.roll_no as roll1_0_0_, student0_.course as course0_0_, student0_.name as name0_0_ from student student0_ where student0_.roll_no=?
RollNo. :5
Name :Jacqub
Course :Hibernate

Click here to download complete source code

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Posted on: August 8, 2012

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