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Hibernate cache Code:-

Hibernate uses the cache concept to reduce the roundtrip from the database server if we want to increase the performance of the application.

Type of cache

1)  Primary Cache:-  It will be created implicitly.

2)  Secondary Cache:-  It will be created explicitly.

create ehcache.xml

<?xml version="1.0"?>

<ehcache>

<defaultCache maxElementsInMemory="100" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="200" />

<cache name="scs.Job" maxElementsInMemory="100" eternal="false" timeToIdleSeconds="5" timeToLiveSeconds="200" />

</ehcache>


Code under 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">


<hibernate-configuration>

<session-factory>

<property name="cache.provider_class">org.hibernate.cache.EhCacheProvider</property>

<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>


<property name="connection.driver_class">com.mysql.jdbc.Driver</property>

<property name="connection.url">jdbc:mysql://localhost:3306/test</property>

<property name="connection.username">root</property>

<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

<property name="hbm2ddl.auto">update</property>

<mapping resource="job.hbm.xml"></mapping>

</session-factory>

</hibernate-configuration>

hibernate.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="scs.Job" table="tbl_job">

<cache usage="read-only" />

<id name="jobid" column="jobid">

<generator class="assigned"></generator>

</id>

<property name="jobtitle" />

</class>

<query name="Myquery">

<![CDATA[from Job p where p.jobid>:a ]]>

</query>


</hibernate-mapping>

Viewjob.java:-

package scs;


import java.util.Iterator;

import java.util.List;


import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;


public class ViewJob {


public static void main(String[] args) {

Configuration cfg = new Configuration();

cfg.configure("hibernate.cfg.xml");

    SessionFactory sf = cfg.buildSessionFactory();

    Session s = sf.openSession();

  //  Query q = s.createQuery("from Job j"); //select * from job

  //  Query q = s.createQuery("select j.jobid,j.jobtitle from Job j"); //select * from job

   // Query q = s.createQuery("select j.jobid,j.jobtitle from Job j where j.jobid=?"); //select * from job

   // q.setInteger(0,5);

//    Query q = s.createQuery("select j.jobid,j.jobtitle from Job j where j.jobid=:a and j.jobtitle=:b"); //select * from job

//    Query q = s.createSQLQuery("select * from tbl_job");

    Query q = s.getNamedQuery("Myquery");

    q.setParameter("a", new Integer(5));

// q.setInteger("a",5);

     // q.setString("b","Professor");

    List lst = q.list();

    Iterator it = lst.iterator();

    while(it.hasNext())

    {

    Job obj =(Job) it.next();

    System.out.println(obj.getJobid() + " "+obj.getJobtitle());

    //  Object arr[] =(Object[])it.next();

    //.out.println(arr[0] + "," + arr[1]);

    //System.out.println(it.next());

    }

    s.close();


}


}




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