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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

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  13. Introduction to JSP

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

Hibernate Setup with an web Application

Follow the steps to setup Hibernate.

Step 1. Create folders like below.

testApp    
     |    
----src     // Java Source Code folder
              |    
-------------beans //Source Code folder   
                 |    
----------------Offer.java //Source Code    
-------------servlet //Source Code folder   
                 |    
----------------DBStartUpServlet.java //Source Code    
-------------dao //Source Code folder   
                 |    
----------------HibernateUtil.java //Source Code    
----config     // config folder where all the configuration files present
              |    
-------------hibernate.cfg.xml //Hibernate Config file   
-------------Offer.hbm.xml// hibernate mapping with Offer TABLE    
-------------log4j.properties// log4j setting    
----WEB-INF //within folder    
          |    
---------web.xml //file   
---------classes //folder   
---------lib //within folder   
              |    
-------------hibernate3.jar //jar file   
-------------antlr-2.7.6rc1.jar //jar file   
-------------asm.jar //jar file   
-------------asm-attrs.jar //jar file   
-------------c3p0-0.9.0.jar //jar file for connection pool   
-------------classes12.jar //if you use ORACLE DATABASE jar file   
-------------mysql-connector-java-5.0.4-bin.jar //if you use MySQL DATABASE jar file   
-------------commons-logging.jar //jar file   
-------------commons-validator.jar //jar file   
-------------dom4j-1.6.1.jar //jar file   
-------------jta.jar //jar file   
-------------log4j-1.2.11.jar //jar file   
-------------nls_charset12.jar //jar file   

Step 2. Add DBStartUpServlet Entry into the web.xml file

This servlet is only for load configuration files related to Hibernate and create Session Factory on start up .
Create Session Factory is very Expensive
Create Session Factory is very Expensive so we added one servlet to create on server startup
Initialize Connection pool on startup
Initialize Connection pool on startup using c3p0.
Initialize log4j configuration
Initialize log4j configuration on startup.

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Hibernate</display-name>
<description>
Hibernate Setup </description>
<servlet>
<servlet-name>
DBStartUpServlet
</servlet-name>
<servlet-class>
servlet.DBStartUpServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
</web-app>

Step 3. DBStartUpServlet Code

package servlet;
public class DBStartUpServlet extends HttpServlet {
/** Initialising the Logger */
protected static final Logger logger=Logger.getLogger(DBStartUpServlet.class);
public void init(ServletConfig config) throws ServletException {
System.out.println("\n**** Initializing Hibernate Init Servlet ********** \n");
super.init(config);


//This is for local properties.
String cfgDir = "D:\\testApp\\config";
logger.info("config dir:"+cfgDir);
initLogPro(cfgDir);
try{
HibernateUtil.appHome = cfgDir;
HibernateUtil.initMonitor();
}catch(Exception e){
e.printStackTrace();
}


}

/** Handles the requests from http client.
* @param request servlet request
* @param response servlet response
*/
protected void service(HttpServletRequest request,HttpServletResponse response)
throws ServletException, java.io.IOException {
}


private void initLogPro(String path){
try{
PropertyConfigurator.configure(path+File.separatorChar+"log4j.properties");
}catch(Exception ex){
System.out.println("Log4J can not be initialized");
logger.info("Log4J can not be initialized");


}
}


}

Step 4. HibernateUtil.java code

package dao;
public class HibernateUtil {
public static String appHome = "No";
private static SessionFactory sessionFactory;
private static final ThreadLocal threadSession = new ThreadLocal();
private static final ThreadLocal threadTransaction = new ThreadLocal();

// Create the initial SessionFactory from the default configuration files
public static void configure(){
try {
String path_properties = appHome+File.separatorChar+"hibernate.cfg.xml";
Configuration configuration = new Configuration();
configuration.addFile(path_properties);
sessionFactory =configuration.configure().buildSessionFactory();

} catch (Throwable ex) {

throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
if(sessionFactory==null) configure();
return sessionFactory;
}

public static Session getSession(){
Session s = (Session) threadSession.get();
// logger.debug("session"+s);
if (s == null) {

s = getSessionFactory().openSession();
threadSession.set(s);
// logger.debug("session 1 $"+s);
}
return s;
}

}

Step 5. hibernate.cfg.xml for hibernate configuration (within config folder)

<?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="Offer.hbm.xml"/>
</session-factory>
</hibernate-configuration>

Step 6. Offer.java bean class.(within beans folder)

package beans;
public class Offer {
private long offerId;
private String offerName;
/**
* @return Returns the offerId.
*/ public long getOfferId() {
return offerId;
}
/**
* @param offerId The offerId to set.
*/
private void setOfferId(long offerId) {
this.offerId = offerId;
}
/** * @return Returns the offerName.
*/
public String getOfferName() {
return offerName;
}
/**
* @param offerName The offerName to set.
*/
public void setOfferName(String offerName) {
this.offerName = offerName;
}
}

Step 7. Offer.java and OFFER TABLE mapping in Offer.hbm.xml

<?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="beans.Offer" table="OFFER">
<id name="offerId" column="offer_id" type="long">
<generator class="increment"/> // This generates the primary key
</id>
<property name="offerName" column="offer_name"/>
</class>
</hibernate-mapping>

Step 8. OFFER TABLE in your database

create table OFFER ( offer_id number; offer_name varchar );

Then start the server. Your SessionFactory is ready to serve.
You can call HibernateUtil.getSession() to get session object and do your coding.

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