hibernate an introduction

Hibernate an introduction

José Luis Muñoz

Jun 12, 2012

Contents 1

1. Problem, Software history

2. Advantages ORM (Object Relation Mapping)

3. How it works (high level vision)

4. Relation: Eclipse – DataBase – Hibernate

5. Configuration file cfg.xml

6. Mapping files

7. Object States

8. Example

Problem, Software history 2

1. SQL sentences into code

Business Classes Data Base

2. DAO Architecture

Business Classes DAO

SQL

Data Base

Problem, Software history 3

3. Mapping problem

Business Classes Data Base

Public class Employee { private String name; }

TABLE Employee ( VARCHAR2(50) NAME, )

Advantages ORM (Object Relation Mapping) 4

Advantages: - Complete database abstraction - IDE mapping generated for objects-tables relation

- Automatic state change

- Easy configurable through xml

- Implements JPA (Java Persistence Api) standar

How it works (high level) 5

How it works (high level more detail) 6

Relation: Eclipse – DataBase – Hibernate 7

Eclipse

Hibernate

Data Base

Data base connection

User Library Configuration file

Configuration file cfg.xml 8

Hibernate dialect

Mapping files 9

http://www.slideshare.net/rahuldausa/hibernate-for-beginners

Object States 10

Example (state change) 11

Methods: save(Object.class )

The End 12

joseluis@trustparency.es