Simple Interface to Persist and Retrieve objects in Java Hibernate

[bbasujon]

Persisting an Object

A custom function has been created to persist a single object using Hibernate. The arguments are the Class name and the object to be persisted. The function at present takes a single object, however you can tweak to persist a collection of objects. My project demanded me to mostly persist a single object, so I have designed it this way. While persisting an object SaveOrUpdate method is used. Therefore if an entry already exists it overwrites it else creates a new entry.

Retrieving an Collection of Object

Another function getObjects is used to get the collection of objects in a List (java.util.List). The arguments are the class name and the query. In both the functions a new SessionFactory has been created to avoid runtime errors.
Simple Interface for Hibernate Operations in Java

package conFIGURATION;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

public class Hibernate {

public int persist(String className,Object obj){

try{

Configuration config = new Configuration();

config.addClass(Class.forName(className));

config.configure();

SessionFactory factory = config.buildSessionFactory();

Session new_session = factory.openSession();

new_session.beginTransaction();

new_session.saveOrUpdate(obj);

new_session.getTransaction().commit();

new_session.close();

}

catch(Exception ex){

System.out.println("Error in Persisting");

System.out.println(ex.getMessage());

ex.printStackTrace();

}

return 1;

}

public List getObjects(String className,String query){

List list = null;

try{

Configuration config = new Configuration();

config.addClass(Class.forName(className));

config.configure();

SessionFactory factory = config.buildSessionFactory();

Session new_session = factory.openSession();

new_session.beginTransaction();

list = new_session.createQuery(query).list();

new_session.getTransaction().commit();

new_session.close();

}

catch(Exception ex){

System.out.println("Error in retrieving");

System.out.println(ex.getMessage());

ex.printStackTrace();

}

return list;

}

}