Tuesday, 29 May 2012

ZK Hibernate Setup

This post will explain how to set up the Hibernate for a ZK Project

Environment

    1. Eclipse 3.7 Indigo IDE Download
    2. Hibernate 4.1.1 Download
    3. JavaSE 1.6 Download
    4. MySQL 5.1 Download
    5. JDBC Driver for MySQL ((MySQL-connector-java-5.1.19.zip)) Download
    6. ZK 6 CE Version
    7. Extract the Hibernate, MySql driver files in a separate folder

Step 1:

 In the Eclipse, Select File –> New –> ZK Project and give Project Name as <AnyNameAsYouWish>
 

Step 2:

Copy the following the following files in <YourProjectName> –> WebContent –> Web-INF –> Lib Folder 

  • antlr-2.7.7.jar
  • dom4j-1.6.1.jar
  • hibernate-commons-annotations-4.0.1.Final.jar
  • hibernate-core-4.1.1.Final.jar
  • hibernate-entitymanager-4.1.1.Final.jar
  • hibernate-jpa-2.0-api-1.0.1.Final.jar
  • javassist-3.15.0-GA.jar
  • jboss-logging-3.1.0.GA.jar
  • jboss-transaction-api_1.1_spec-1.0.0.Final.jar
  • mysql-connector-java-5.1.18-bin.jar

                 image

Step 3:

Create Hibernate Configuration File

Expand Java Resources Folder. Right Click on src folder and Select New->General->File and give the name as hibernate.cfg.xml

image

Paste the following code

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"
http://www.hibernate.org/dtd/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/drkare</property>
<property name="connection.username">root</property>
<property name="connection.password">123</property>

<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>

<!-- SQL dialect -->
<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>

<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>

<!-- Mapping Classes -->

</session-factory>
</hibernate-configuration>

Please take care to change the DB Name, User and Password according your setup

Step 4:

Now let us create the hibernate utility class where we will establish the DB Configuration using the above configuration file

Right Click on Java Resource folder-> Select New –> Class. Give the Package name as HibernateUtilities and Class name as HibernateUtil.java

image

Paste the following code

package HibernateUtilities;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class HibernateUtil {

    private static SessionFactory factory;
    private static ServiceRegistry serviceRegistry;

    public static Configuration getInitConfiguration() {
        Configuration config = new Configuration();
        config.configure();
        return config;
    }

    public static Session getSession() {
        if (factory == null) {
            Configuration config = HibernateUtil.getInitConfiguration();
            serviceRegistry = new ServiceRegistryBuilder().applySettings(
                    config.getProperties()).buildServiceRegistry();
            factory = config.buildSessionFactory(serviceRegistry);
        }
        Session hibernateSession = factory.getCurrentSession();
        return hibernateSession;
    }

    public static Session beginTransaction() {
        Session hibernateSession;
        hibernateSession = HibernateUtil.getSession();
        hibernateSession.beginTransaction();
        return hibernateSession;
    }

    public static void CommitTransaction() {
        HibernateUtil.getSession().getTransaction().commit();
    }

    public static void closeSession() {
        HibernateUtil.getSession().close();
    }

    public static void rollbackTransaction() {
        HibernateUtil.getSession().getTransaction().rollback();
    }

}

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