This example program shows how to insert multiple rows using the batch processing in hibernate. when there are thousand of rows to be persisted, everytime iterating and inserting will cause the memory problem. Hibernate stores all the persisted objects in the memory. To avoid this problem use batch processing in the hibernate.
also read:
To use the batch processing feature, first set hibernate.jdbc.batch_size as 50. This will tell the hibernate container that every 50 rows to be inserted as batch. Also there is a slight change in the code.
[code lang=”java”]
for (int i =0;i<100;i++)
{
EmployeeInfo employeeInfo = new EmployeeInfo();
employeeInfo.setSno(1);;
employeeInfo.setName("Value : "+String.valueOf(i));
session.save(employeeInfo);
if (i%50 == 0)
{
session.flush();
session.clear();
}
}
[/code]
the above code is used for inserting 50 rows. Do remember to call session.flush() every time. That will make the data to be persisted.
JavaBeatHibernateExample.java
[code lang=”java”]
package javabeat.net.hibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
/**
* source : www.javabeat.net
*/
public class JavaBeatHibernateExample {
public static void main(String args[]){
Configuration configuration = new Configuration();
configuration.addClass(javabeat.net.hibernate.EmployeeInfo.class);
configuration.setProperty("hibernate.dialect",
"org.hibernate.dialect.DerbyDialect");
configuration.setProperty("hibernate.connection.url",
"jdbc:derby://localhost:1527/SampleDB");
configuration.setProperty("hibernate.connection.username", "root");
configuration.setProperty("hibernate.connection.driver_class",
"org.apache.derby.jdbc.ClientDriver");
configuration.setProperty("hibernate.connection.password", "root");
configuration.setProperty("hibernate.transaction.factory_class",
"org.hibernate.transaction.JDBCTransactionFactory");
configuration.setProperty("hibernate.current_session_context_class",
"thread");
configuration.setProperty("hibernate.show_sql", "true");
configuration.setProperty("hibernate.jdbc.batch_size", "50");
SessionFactory sessionFactory = configuration.buildSessionFactory();
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
for (int i =0;i<100;i++)
{
EmployeeInfo employeeInfo = new EmployeeInfo();
employeeInfo.setSno(1);;
employeeInfo.setName("Value : "+String.valueOf(i));
session.save(employeeInfo);
if (i%50 == 0)
{
session.flush();
session.clear();
}
}
transaction.commit();
session.close();
}
}[/code]
EmployeeInfo.hbm.xml
[code lang=”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" >
<hibernate-mapping>
<class name="javabeat.net.hibernate.EmployeeInfo" table="Employee_Info">
<id name="sno" column="sno" type="java.lang.Integer">
<generator class="increment"/>
</id>
<property name="name" column="name" type="java.lang.String"/>
</class>
</hibernate-mapping>
[/code]