24. Spring ORM Module

III. Spring ORM

Spring provides API to easily integrate spring with ORM frameworks
Popular ORM Tools are
o    Hibernate
o    Java Data Objects (JDO)
o    JPA(Java Persistence API),
o    JDO(Java Data Objects),
o   iBATIS.

Standalone Hibernate DB Operations
Normal DML Hibernate blocks
Session s = sf.openSession();
Transaction tx = sf.beginTransaction();
sf.save(studentob)
tx.close();
s.close();

Normal DDL Hibernate blocks
Session s = sf.openSession();
Student ob = sf.get(student.clss, id)
s.close();

Spring with Hibernate
In spring we have HibernateTemplate class for hibernate functionality
·          save()/ persist()
·         update()/ merge()
·         delete()
·         get / load
·         find(HQL) : List<T>
·         findbyCriteria() : List<T>
·         In this we don’t worry about close related things in spring hibernate template
·         whenever u call hibernateTemplate using spring, our spring communicates with Hibernate xml and asks for connection related things
·         the reduced code as ht.save(), ht.update(), ht.update()
Example:
Hibernate code
// configuration 
Configuration cfg=new Configuration();   
cfg.configure("hibernate.cfg.xml");   
   
//creating seession factory object   
SessionFactory factory=cfg.buildSessionFactory();   
   
//creating session object   
Session session=factory.openSession();   
   
//creating transaction object   
Transaction t=session.beginTransaction();   
       
Student st=new Student(10,"Vijay",”HYDERABAD”);   
//save the object   
session.persist(st);

//transaction is commit
t.commit();
session.close();  

Spring Code
Student st=new Student(10,"Vijay",”HYDERABAD”);    
hibernatetmp.save(st); 

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