Wednesday, September 15, 2010


Advanced features

Caching solutions, transactions and other features Hibernate provides are not so easy to
implement. It is actually non sense to develop something which already exist.
Using Hibernate everything is there. You just have to use it.

How Hibernate works

What is nice and in my opinion an advantage over entity beans, hibernate starts from simple java
classes (Pojo = Plain Old Java Objects).

To use hibernate you will create a simple java class:

public class Bug
implements Serializable
private int hashValue = 0;
private java.lang.Integer id;
private java.lang.String title;
public Bug()
public Bug(java.lang.Integer fid)
public java.lang.Integer getId() {
return id;
public void setId(java.lang.Integer id) { = id;
public java.lang.String getTitle() {
return title;
public void setTitle(java.lang.String title) {
this.title = title;
Than you create a mapping file. The mapping file explains Hibernate which field in the class is
mapped to which field in the database.

And you start using your hibernate class.

Example to create a new entry in the database:

try {
Bug bug = new Bug();
Transaction tx = session.beginTransaction();;
} catch (HibernateException e) {

The creation of the description file can be done with tools like MyEclipse. MyEclipse provides
functionality to create classes and description files directly from database tables.
Hibernate includes tools to
• generate Java classes from description files
• description files from existing database tables
• database tables from description files.

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