Hibernate

Program Of EHCache
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Example:

This example shows the implementation of EHCache

hibernate.cfg.xml

<?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">

<!-- Generated by MyEclipse Hibernate Tools.   -->
<hibernate-configuration>
<session-factory>
<property name="connection.username">system</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="connection.password">oracle</property>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver
</property>
<property name="hibernate.cache.provider_class"
>net.sf.ehcache.hibernate.EhCacheProvider
</property>
<property name="hibernate.cache.use_query_cache">true</property>
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.generate_statistics">true</property>
<property name="hibernete.ca"></property>
<mapping resource="m-to-m.hbm.xml"/>
</session-factory>
</hibernate-configuration>

m-to-m.hbm.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
          "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-mapping>
<class name="mypack.Previlige">
<cache usage="read-write"/>
<id name="id" type="int">
<generator class="increment" />
</id>
<property name="name"/>
<property name="cost" type="int"/>
<set name="users" table="empPrevilige" inverse="true">
<key column="previligeId"/>
<many-to-many class="mypack.Emp" column="empId" />
</set>
</class>
<class name="mypack.Emp">
<cache usage="read-write"/>
<id name="id" type="int">
<generator class="sequence" >
<param name="sequence">keygenerator</param>
</generator>
</id>
<property name="name" />
<property name="job" />
<property name="salary" type="int"/>
<set name="previliges" table="empPrevilige" cascade="all">
<cache usage="read-write"/>
<key column="empId"/>
<many-to-many class="mypack.Previlige" column="previligeId" />
</set>
</class>
</hibernate-mapping>

ehcache.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
          "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-mapping>
<class name="mypack.Previlige">
<cache usage="read-write"/>
<id name="id" type="int">
<generator class="increment" />
</id>
<property name="name"/>
<property name="cost" type="int"/>
<set name="users" table="empPrevilige" inverse="true">
<key column="previligeId"/>
<many-to-many class="mypack.Emp" column="empId" />
</set>
</class>
<class name="mypack.Emp">
<cache usage="read-write"/>
<id name="id" type="int">
<generator class="sequence" >
<param name="sequence">keygenerator</param>
</generator>
</id>
<property name="name" />
<property name="job" />
<property name="salary" type="int"/>
<set name="previliges" table="empPrevilige" cascade="all">
<cache usage="read-write"/>
<key column="empId"/>
<many-to-many class="mypack.Previlige" column="previligeId" />
</set>
</class>
</hibernate-mapping>

Emp.java

package r4r;
import java.util.*;
public class Emp {

int id;
String name,job;
int salary;
Set<Previlige> priviliges;
public Emp() {
super();
}
public Emp(String name, String job, int salary, Set<Previlige> priviliges) {
super();
this.name = name;
this.job = job;
this.salary = salary;
this.priviliges = priviliges;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
public Set<Previlige> getPriviliges() {
return priviliges;
}
public void setPriviliges(Set<Previlige> priviliges) {
this.priviliges = priviliges;
}
}

Previlage.java

package r4r;

import java.util.Set;
public class Previlige {
int id;
String name;
int cost;
Set<Emp> users;
public Previlige() {
super();
}
public Previlige(String name, int cost) {
super();
this.name = name;
this.cost = cost;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getCost() {
return cost;
}
public void setCost(int cost) {
this.cost = cost;
}
public Set<Emp> getUsers() {
return users;
}
public void setUsers(Set<Emp> users) {
this.users = users;
}
}

SessionProvider.java

package r4r;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class SessionProvider {
static SessionFactory factory;
static
{
Configuration cfg=new Configuration().configure();
factory=cfg.buildSessionFactory();
}
public static Session getSession() {
return factory.openSession();
}

}

S2Test.java

package r4r;

import java.util.*;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
import org.hibernate.stat.SecondLevelCacheStatistics;

public class S2Test {

public static void main(String[] args) {
try
{
Configuration cfg=new Configuration().configure();
SessionFactory f=cfg.buildSessionFactory();
for(int i=1;i<=2;i++)
{
Session s=f.openSession();
Date d1=new Date();
Emp e=(Emp)s.load(Emp.class, 52501);
Set<Previlige> set=e.getPriviliges();
Date d2=new Date();
System.out.println("query took "+(d2.getTime()-d1.getTime())+
" milliseconds "+i+" time.");
System.out.println("Emp Details:");
System.out.println(e.getName()+"\t"+e.getJob()+"\t"+
e.getSalary());
System.out.println("previliges  details...");
Iterator<Previlige> itr=set.iterator();
while(itr.hasNext())
{
Previlige pr=itr.next();
System.out.println(pr.getId()+"\t"+pr.getName()+"\t"
+pr.getCost());
}
s.close();
SecondLevelCacheStatistics sts1 = f.getStatistics().
getSecondLevelCacheStatistics("mypack.Emp");
System.out.println("details of Emp cache region:");
System.out.println(sts1);
SecondLevelCacheStatistics sts2 = f.getStatistics().
getSecondLevelCacheStatistics("mypack.Previlige");
System.out.println("details of previlige cache region:");
System.out.println(sts2);
}
}catch(Exception e)
{
System.out.println(e);
}
}

}
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