Introduction to Hibernate and ORM Arcitecture Hibernate Configuration Annotations, Mappings and HQL Cascade Caching Interceptors U: www.knowarth.com E: contact@knowarth.com

1. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
By Dinesh Radadiya
Hibernate Basics
By Jainesh Trivedi
© 2015 KNOWARTH

2. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Agenda
2
 Introduction to Hibernate and ORM
 Arcitecture
 Hibernate Configuration
 Annotations, Mappings and HQL
 Cascade
 Caching
 Interceptors
© 2015 KNOWARTH

3. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
3
Introduction
© 2015 KNOWARTH

4. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Introduction
4
 High Performance Object/Relational mapping solution and
queryservice
 Open Source Persistence Framework created by Gavin King in
2001.
 Takes care of mapping of Java datatypes and SQL type.
 It also maps Java classes to the database tables.
© 2015 KNOWARTH

5. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 55
Introduction
 Programming code that converts data between
database and OO Languages.
 ORM Advantages:-
 Allows business code to acces objects instead of DB
tables.
 Entities based on business structure instead of DB.
 Hides details of SQL queries.
 No need to deal with database implementation.
© 2015 KNOWARTH

6. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 6
Hibernate Architecture
Hibernate Architecture
© 2015 KNOWARTH

7. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 7
Hibernate Architecture
© 2015 KNOWARTH

8. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 8
Hibernate Architecture
● Configuration Object
● SessionFactory Object
● Session Object
● Transaction Object
● Query Object
● Criteria Object
© 2015 KNOWARTH

9. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 9
Hibernate Architecture
● Criteria criteria =
session.createCriteria(StockDailyRecord.class);
● .addOrder(Order.asc(“date”));
● Restrictions in criteria object:
lt,ge,gt,le,isNull,like,isNotNull,between,etc
● .add(Restrictions.like(“Name”,”Know%”))
© 2015 KNOWARTH

10. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 10
Hibernate Architecture
● Downloading Hibernate:
– Download the latest version of
Hibernate http://www.hibernate.org/do
wnloads
© 2015 KNOWARTH

11. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
1111
Hibernate Configuration
© 2015 KNOWARTH

12. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Hibernate Configuration
12
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Connection to Oracle db -->
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="hibernate.connection.username">test</property>
<property name="hibernate.connection.password">test123</property>
<!-- Auto commit to false -->
<property name="hibernate.connection.autocommit">false</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.use_sql_comments">true</property>
</session-factory>
</hibernate-configuration>
© 2015 KNOWARTH

13. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
1313
Annotations,Mapping and HQL
© 2014 Knowarth

14. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Annotations,Mapping and HQL
14
– One to One
– One to Many
– Many to One
– Many to Many
© 2015 KNOWARTH

15. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Annotations,Mapping and HQL
15
 Powerful tool to define mapping without XML
files,one can use annotations with or as a
replacement to XML files
 Enviornment Setup for annotations:-
● Install Hiberanate 3.X annotations package to
use annoations for mapping.
 @Entity,@Table,@Id,@GeneratedValue,@Column are
some of the basic annoations
© 2015 KNOWARTH

16. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Annotations,Mapping and HQL
16
 Hibernate Query Language is a query language
similar to SQL but operates on objects instead of
table and column
 HQL queries are translated to conventional SQL
queries which inturn perform the operations.
 HQL makes use of persistent objects and their
properties to operate.

17. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
17
Examples
© 2015 KNOWARTH

18. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Cascade
18
● Cascade is an important feature provided by Hibernate using
which one can manage state of other objects related to a
particular object.
● Its like propogating the change to all the interlinked objects by
just applying the change to the parent object.
● Cascading can be used to easily maintain the consistency but it
should be used wisely inorder to avoid unnecessary cascade
affects.
© 2015 KNOWARTH

19. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Native SQL
19
 Hibernate provides a method createSQL() to make native SQL
statement directly.
 One can use native calls to insert,update,delete and load date
using this and we can use stored procedures.
Query query = session.createSQLQuery(
"select * from stock s where s.stock_code = :stockCode")
.addEntity(Stock.class)
.setParameter("stockCode", "7277");
List result = query.list();
© 2015 KNOWARTH

20. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Caching
20
 Caching is basically used to enhance the system performance
by reducing the number of database hits.
 Hibernate cache sits between the database and your
application.
© 2015 KNOWARTH

21. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Caching
21
First-level cache:
● Always associates with the Session object. Hibernate uses this
cache by default.
● Its easy to understand the first level cache if we understand the fact
that it is associated with Session object.
● When we query an entity first time, it is retrieved from database and
stored in first level cache associated with hibernate session.
● The loaded entity can be removed from session using evict()
method. The next loading of this entity will again make a database
call if it has been removed using evict() method.
● The whole session cache can be removed using clear() method. It
will remove all the entities stored in cache.
© 2015 KNOWARTH

22. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Caching
22
Second-level cache:
● Always associates with sessionFactoryObject and is available to be
● used in all sessions which are created using that particular session
factory.
● Second level cache is an optional cache and first-level cache will
always be consulted before any attempt is made to locate an object in
the Second-level cache.
● Any third-party cache can be used with Hibernate.
An org.hibernate.cache.CacheProvider interface is provided
<property name="hibernate.cache.use_second_level_cache">true</property>
<property
name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider
</property>

23. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Caching
23
To use the query cache, you use the setCacheable(Boolean) method of the
Query class.
© 2015 KNOWARTH

24. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 24
Interceptors
© 2015 KNOWARTH

25. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 25
Interceptors
● As we know that in Hibernate, an object will be created and persisted. Once the
object has been changed, it must be saved back to the database.
● Thus the object passed through different stages of life-cycle before been saved,
so interceptors provide methods that can be used to manipulate objects during
the different stages of life cyle.
● These methods are callbacks from the session to the application, allowing the
application to inspect and/or manipulate properties of a persistent object before
it is saved, updated, deleted or loaded.
● To build a custom interceptor one can do it by simply implementing the
Interceptor interface or extend the EmptyInterceptor class.
© 2015 KNOWARTH

26. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth 26
Interceptors
● Methods in interceptors
© 2015 KNOWARTH

27. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
© 2013 Knowarth
Query & Questions
27© 2015 KNOWARTH

28. SLIDE TITLE
 Click to edit Master text styles
 Second level
 Third level
 Fourth level
 Fifth level
THANK YOU
© 2015 KNOWARTH