1. Agenda What is Hibernate Spring Integration Questions Overview
Benefits
Example
Spring Integration
Questions

2. What is Hibernate?
Popular Open Source Object/Relational Mapping (ORM) tool
Transparent persistence for POJOs (Plain Old Java Objects)

3. Object/Relational Mapping
JavaObject
int id;
String name;
String getName()
int getId()
void setName(String)
void setId(int)
SQL Table
id [int] primary key,
name [varchar(50)]
Magic Happens Here
(O/R Mapper – i.e. Hibernate)

4. Other ORM Solutions
“Open”
iBatis SQL Maps
JDO
JPA
Commercial
TopLink

5. Why Hibernate? Retains natural object model (transparent)
Minimizes Code
Does not require a container
Model is not tied to persistance implementation

6. Hibernate's Goal
Remove 95% of common data persistence problems

9. How do you use it? Act on your data model Query in SQL and/or HQL
... or using your object model

10. Auction Object Model

11. Persistant Class Default Constructor Getters/Setters
public class AuctionItem {
private Long _id;
private Set _bids;
private Bid _successfulBid
private String _description;
public Long getId() {
return _id; }
private void setId(Long id) {
_id = id;
public String getDescription() {
return _description;
public void setDescription(String desc) {
_description=desc; …
Default Constructor
Getters/Setters
Collections use interface types
Identifier property

12. XML Mapping Readable metadata Column/Table map Key Generation
<class name=“AuctionItem” table=“AUCTION_ITEM”>
<id name=“id” column=“ITEM_ID”>
<generator class=“native”/>
</id>
<property name=“description” column=“DESCR”/>
<many-to-one name=“successfulBid” column=“SUCCESSFUL_BID_ID”/>
<set name=“bids”
cascade=“all”
lazy=“true”>
<key column=“ITEM_ID”/>
<one-to-many class=“Bid”/>
</set>
</class>
Readable metadata
Column/Table map
Key Generation
Collections
Fetching Strategies

13. Working with Data Retrieve an AuctionItem and change description
Session session = sessionFactory.openSession();
Transaction tx = s.beginTransaction();
AuctionItem item =
(AuctionItem) session.get(ActionItem.class, itemId);
item.setDescription(newDescription);
tx.commit();
session.close();

14. Working with Data
Retrieve an AuctionItem and create a new persistent Bid
Bid bid = new Bid();
bid.setAmount(bidAmount);
Session session = sf.openSession();
Transaction tx = session.beginTransaction();
AuctionItem item =
(AuctionItem) session.get(ActionItem.class, itemId);
bid.setItem(item);
item.getBids().add(bid);
tx.commit();
session.close();

15. Hibernate in code
Retrieve an AuctionItem and create a new persistent Bid
Bid bid = new Bid();
bid.setAmount(bidAmount);
Session session = sf.openSession();
Transaction tx = session.beginTransaction();
AuctionItem item =
(AuctionItem) session.get(ActionItem.class, itemId);
bid.setItem(item);
item.getBids().add(bid);
tx.commit();
session.close();

16. Hibernate in code
Retrieve an AuctionItem and create a new persistent Bid
Session session = sf.openSession();
Transaction tx = session.beginTransaction();
AuctionItem item =
(AuctionItem) session.get(ActionItem.class, itemId);
tx.commit();
session.close();
item.setDescription(newDescription);
Session session2 = sf.openSession();
Transaction tx = session2.beginTransaction();
session2.update(item);
session2.close();

17. Benefits Metadata controlled persistence
Transparent - working with the model, not the data access technology
Pooling, Caching, Transactions can all be handled outside of our code

18. Integrating Spring and Hibernate

19. Spring and Hibernate
Benefits
Examples

20. Benefits Resource Management Extended Transaction Support
IoC / AOP Session Management
Extended Transaction Support
JTA and/or JDBC
Flexible Transaction Demarcation
Programmatic
Declarative (Spring's XML config)
HibernateTemplate
Simplifies Hibernate API

21. Spring IoC
Session
POJO
DAO
setSession()
save()

22. Spring Interceptors (AOP)
Business Logic
Interceptor
DAO
getCatById()
save(Cat)
Session
Spring Framework

23. Spring’s HibernateTemplate
Hibernate Only:
public User getUserBy Address(final String ) { try { Session session = sessionFactory.openSession(); List list = session.find( "from User user where user. =?",
, Hibernate.STRING); return (User) list.get(0); } finally { session.close(); } }
HibernateTemplate:
public User getUserBy Address(final String ) { List list = getHibernateTemplate().find( "from User user where user. =?", , Hibernate.STRING); return (User) list.get(0); }