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Hibernate

  1. Advantage of Hibernate over JDBC

  2. Hibernate Setup with an web Application

  3. First Hibernate Application

  4. Hibernate mapping with Database TABLE

  5. Hibernate Data Type-Java Data Type - SQL Data Type mapping

  6. One to Many Relation in Hibernate

  7. One to Many Relation in Hibernate bi-directional

  8. Many to Many Relation in Hibernate

  9. HQL: The Hibernate Query Language

  10. Criteria Queries

  11. Criteria Queries : Equal (eq), Not Equal(ne), Less than (le), greater than (gt),greater than or equal(ge) and Ordering the results

  12. Criteria Queries: And OR conditions

  13. Hibernate generator to generate id (primary key)

  14. prevent concurrent update in Hibernate,slate object updatation in Hibernate,version checking in Hibernate

    Struts


  1. Model View Controller (MVC)

  2. Model View Controller (MVC)

  3. Struts Flow-How Struts Works?

  4. Struts Tutorial - Struts Setup- First Struts Action class setup

  5. Message Resources

  6. Validation Framework

  7. Validation Framework-client side

  8. ForwardAction

  9. IncludeAction

  10. DispatchAction

  11. LookupDispatchAction

  12. DynaActionForm

  13. DynaActionForm

  14. Struts Tutorial - Mutli-click prevention using struts tokens-Prevent Duplicate Submission

  15. Logic Iterate Map and List


JSP


  1. JSP Tutorial

  2. Introduction to JSP

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  9. Introduction to JSP

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  11. The jsp:setProperty Action

  12. The jsp:getProperty Action

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Spring



  1. Spring Tutorial

  2. Introduction to Spring

  3. Benefits of Using Spring Framework

  4. Inversion of Control in Spring

  5. Introduction to BeanFactory

  6. Dependency Injection in Spring

  7. Collections Setter Injection

  8. Bean Scopes in Spring

  9. Spring IOC Setup Step by Step

  10. Bean Lifecycle in Spring

  11. ApplicationContext

  12. MessageSources in Spring

  13. Web Spring MVC framework

  14. Developing Your First Spring Web Application

  15. Developing Your Second Spring Web Application with Spring Form

  16. Developing Your First Spring Web Application with Spring Validation Framework with Code Example

  17. Spring integration with Hibernate

Hibernate Tutorial Step by Step -- Code Examples

Many to Many Relation in Hibernate

There are two table EVENTS and SPEAKERS . One Event can have multiple speakers. And One Speaker can speak in multiple Event. So this is many to many relation. To maintain this relation we have to introduce third TABLE name EVENT_SPEAKERS .

Step 1. create a tables EVENTS , SPEAKERS and EVENT_SPEAKERS in your database

create table EVENTS (
event_id number, //PRIMARY KEY
event_name varchar
);
create table SPEAKERS (
speaker_id number, //PRIMARY KEY
speaker_name varchar,
);
create table EVENT_SPEAKERS (
elt number,//primary key event_id number, speaker_id number
);

Step 2. event.hbm.xml - Hibenate mapping-Which maps to EVENTS TABLE

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Event" table="events">
<id name="id" column="event_id" type="long">
<generator class="increment"/>
</id>
<property name="name" column="event_name" type="string" length="100"/>
<set name="speakers" table="event_speakers" cascade="all">
<key column="event_id"/>
<many-to-many class="Speaker"/>
</set>
</class>
</hibernate-mapping>

Step 3. Mapping speaker.hbm.xml- Which maps to SPEAKERS TABLE.

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Speaker" table="speakers">
<id name="id" column="speaker_id" type="long">
<generator class="increment"/>
</id>
<property name="name" column=" speaker_name" type="string" length="100"/>
<set name="events" table="event_speakers" cascade="all">
<key column="speaker_id"/>
<many-to-many class="Event"/>
</set>
</class>
</hibernate-mapping>

Step 4. Create Event.java bean class.

public class Event{
private long id;
private String name;
private Set speakers;
public void setId(long id) {
this.id = id;
}
public long getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void setSpeakers(Set speakers) {
this.speakers = speakers;
}
public Set getSpeakers() {
return speakers;
}
}

Step 5. Create Speaker.java bean class.

public class Speaker{
private long id;
private String name;
private Set events;
public void setId(long id) {
this.id = id;
}
public long getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set getEvents() {
return this.events;
}
public void setEvents(Set events) {
this.events = events;
}
}

Step 6. add event.hbm.xml and speaker.hbm.xml into hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<lt;!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/techfaqdb</property>
<property name="connection.username">techfaq</property>
<property name="connection.password">techfaq</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="hibernate.c3p0.min_size">1</property>
<property name="hibernate.c3p0.max_size">4</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.max_statements">50</property>
<!-- MySQL dialect//different for different Database -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping resource="event.hbm.xml"/>
<mapping resource="speaker.hbm.xml"/>
</session-factory>
</hibernate-configuration>

Here is the code : how to save and fetch data

Event event = new Event();
event.setName("Inverse test");
event.setSpeakers(new HashSet());
event.getSpeakers().add(new Speaker("Ram", event));
event.getSpeakers().add(new Speaker("Syam", event));
session.save(event); /// Save All the Data
event = (Event) session.load(Event.class, event.getId());
Set speakers = event.getSpeakers();
for (Iterator i = speakers.iterator(); i.hasNext();) {
Speaker speaker = (Speaker) i.next();
System.out.println(speaker.getFirstName());
System.out.println(speaker.getId());
}
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