Hibernate - KNOWARTH

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By Dinesh Radadiya
Hibernate Basics
By Jainesh Trivedi
© 2015 KNOWARTH

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© 2013 Knowarth
Agenda
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 Introduction to Hibernate and ORM
 Arcitecture
 Hibernate Configuration
 Annotations, Mappings and HQL
 Cascade
 Caching
 Interceptors
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Introduction
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Introduction
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 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.
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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.
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Hibernate Architecture
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● Configuration Object
● SessionFactory Object
● Session Object
● Transaction Object
● Query Object
● Criteria Object
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● 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%”))
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● Downloading Hibernate:
– Download the latest version of
Hibernate http://www.hibernate.org/do
wnloads
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Hibernate Configuration
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Hibernate Configuration
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<?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>

<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>

<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>
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Annotations,Mapping and HQL
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– One to One
– One to Many
– Many to One
– Many to Many
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 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
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 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.

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Examples
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Cascade
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● 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.
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Native SQL
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 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();
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Caching
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 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.
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Caching
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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.
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Caching
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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>

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Caching
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To use the query cache, you use the setCacheable(Boolean) method of the
Query class.
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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.
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Interceptors
● Methods in interceptors
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Query & Questions
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Hibernate - KNOWARTH

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