Author Topic: Simple Interface to Persist and Retrieve objects in Java Hibernate  (Read 1594 times)

bbasujon

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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;
 
}
 
}
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