In this example we shall show you how to create a new SessionFactory example in Hibernate. To create a new SessionFactory example in Hibernate one should perform the following steps:
- Create a new
Configuration, that allows the application to specify properties and mapping documents to be used when creating aSessionFactory. Usually an application will create a singleConfiguration, build a single instance ofSessionFactoryand then instantiate Sessions in threads servicing client requests. - With
configure()API method use the mappings and properties specified in an application resource namedhibernate.cfg.xml. Then, withbuildSessionFactory()instantiate a newSessionFactory, using the properties and mappings in this configuration. TheSessionFactorywill be immutable, so changes made to the Configuration after building the SessionFactory will not affect it.
In the code snippets that follow, you can see the CreateHibernateSessionFactoryExample Class that applies all above steps and the hibernate.cfg.xml file, that holds all configuration for Hibernate.
package com.javacodegeeks.snippets.enterprise;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class CreateHibernateSessionFactoryExample {
@SuppressWarnings("unused")
private static SessionFactory sessionFactory;
public static void main(String[] args) throws Exception {
sessionFactory = new Configuration().configure().buildSessionFactory();
}
}
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>
<!-- JDBC connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/companydb</property>
<property name="connection.username">jcg</property>
<property name="connection.password">jcg</property>
<!-- JDBC connection pool, use Hibernate internal connection pool -->
<property name="connection.pool_size">5</property>
<!-- Defines the SQL dialect used in Hiberante's application -->
<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>
<!-- Display and format all executed SQL to stdout -->
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
</session-factory>
</hibernate-configuration>
This was an example of how to create a new SessionFactory example in Hibernate.
