Category Archives: hibernate

Configure Hibernate for Jdeveloper

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Here is the way to configure hibernate to work on JDeveloper

First thing first

As you know the three main things in setting up any hibernate is to have

  • Reference to hibernate3.jar library in classpath
  • Having hibernate.cfg.xml file (can be done programmatic way as well)
  • The mapping file (eg. Simple.hbm.xml)

To make this work for JDeveloper, download the latest version of hibernate3

Refer the downloaded location in the projects library and classpath by Adding a Library(Add Library)  – Create New – Add Entry


Provide the Library Name as ‘Hibernate’ (can be of your choice) and add the following libraries

  • hibernate3.jar
  • antlr-2.7.6.jar
  • commons-collections-3.1.jar
  • dom4j-1.6.1.jar
  • javassist-3.4.GA.jar
  • jta-1.1.jar
  • slf4j-api-1.5.2.jar

Have the hibernate.cfg.xml file in your current working directory


<?xml version='1.0' encoding='utf-8'?>

<!--<span class="hiddenSpellError" pre=""-->DOCTYPE hibernate-configuration PUBLIC

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>

<!-- Database connection settings -->

<property

name="connection.driver_class">oracle.jdbc.driver.OracleDriver

<property

name="connection.url">jdbc:oracle:thin:@localhost:1521:XE

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

<property name="connection.password">fusion</property>

<!-- <span class="hiddenSpellError" pre="">JDBC</span> connection pool (use the built-in) -->

<property name="connection.pool_size">1</property>

<!-- SQL dialect -->

<property

name="dialect">org.hibernate.dialect.OracleDialect</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 <span class="hiddenSpellError" pre="to ">stdout</span> -->

<property name="show_sql">true</property>

<!-- Drop and re-create the database schema on startup -->

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

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

</session-factory>

</hibernate-configuration>

The configuration file is for Oracle driver.. this can be changed


<property

name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

<property

name="connection.url">jdbc:oracle:thin:@localhost:1521:XE

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

<property name="connection.password">fusion</property>

You have to specify the mapping file also


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

the highlighted libraries are added from slf4j to overcome

As the final step, represent the db table of yours as a simple pojo class (Simple.java) like


public class Simple {

private Long id;

private String title;

private Date date;

public Simple() {}

public Long getId() {

return id;

}

private void setId(Long id) {

this.id = id;

}

public Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

private Set participants = new HashSet();

public Set getParticipants() {

return participants;

}

public void setParticipants(Set participants) {

this.participants = participants;

}

}

where id, title and date represents the column name of the table in the db

Have a corresponding mapping file in the same qualified path (Simple.hbm.xml)


<?xml version="1.0"?>

<!--<span class="hiddenSpellError" pre=""-->DOCTYPE hibernate-mapping PUBLIC

"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class table="EVENTS">

<id name="id" column="EVENT_ID">

<generator/>

</id>

<property name="date" column="EVENT_DATE"/>

<property name="title"/>

</class>

</hibernate-mapping>

Have a configFile.java where you instantiate the Configuration, Session and get involved in the transaction


import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

public class ConfigFile {

static Session session;

public ConfigFile() {

super();

}

public static void main(String[] args){

Configuration cfg = new Configuration().configure();

SessionFactory sessions = cfg.buildSessionFactory();

Session sess = sessions.openSession();

session = sess;

Simple s = new Simple();

s.setTitle("hi");

session.save(s);

}

}

Run the configFile.java.. that’s it. 🙂