hibernate

Different Ways to Configure in Hibernate 4.3

Before working with hibernate in your code, you will need to configure Hibernate with information regarding your database such as host, port, credentials etc. You also need to create mappings that tell hibernate how to map the state of a Java entity to the columns of its corresponding table.

We can configure various hibernate features either through annotations or through xml files (hbm files). Preferred approach currently is annotations.

 

You can configure Hibernate mainly in three ways:

Embedding Value Types and Collections Within an Entity Class in Hibernate 4.3

We have already seen the definition and properties of an entity and value class in http://javajee.com/entities-and-value-types-in-hibernate-43. We will not see how we can actually embed a value type within an entity. We will also see how we can embed a collection inside an entity.

 

Most Common Annotations Used in Hibernate 4.3

Here we will discuss most commonly used basic annotations in hibernate - @Entity, @Table, @Id, @GeneratedValue, @Column, @Basic, @Transient, @Temporal and @Lob. Even though many annotations has both JPA (java.persistance) and hibernate (org.hibernate) versions, it is preferred to use JPA annotations whenever possible. As you can see below, some of the hibernate specific annotations are already deprecated.

 

CRUD Operations in Hibernate 4.3

CRUD operations are Create(save), Read(select), Update(update) and Delete(delete).

Examples discussed here need to be tried out on top of the lab done @  http://javajee.com/lab-your-first-hibernate-43-program.

 

Session

Select, Save, update and delete operations in hibernate should be called within a session:

 SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();

Logging in Hibernate 4.3

You have different logging options in Hibernate and let us see some of those options quickly. Hibernate supports simple property based log enabling to supporting standard logging frameworks and even programmatically accessing log statistics.

 

Configuring a Hibernate 4.3 Application with JPA Entity Managers

In JPA, the EntityManager controls the lifecycle of the entities.

Different ORM vendors provide its own entity manager, which is usually a wrapper around the core API and thus supports the JPA programming interfaces, life cycles and query language.

You obtain the EntityManager from an entity manager factory. EntityManagerFactory has the same role as SessionFactory in Hibernate.

Hibernate 4.3 Essentials

This note book will help you to get started with Hibernate 4 like setting up environment, inheritance, mappings, HQL and the Criterial API. 

All the examples in this book is tested with Hibernate version 4.3.11.

Please refer to the hibernate references section to see the reference books that we use for learning and training purposes.

Introduction to Hibernate Framework

Hibernate is a framework that help you easily map Java classes to database tables (and Java fields to DB columns, Java data types to DB data types etc.), without writing the usual create, select, update and delete sql queries.

 

Object Relational Mapping (ORM)

Hibernate is an ORM framework. Hibernate help you map your object model to a relational model. 

Downloading Hibernate Jar Files

Hibernate 4 jars can be downloaded from the SourceForge web site at http://sourceforge.net/projects/hibernate/files/hibernate4 or from http://hibernate.org/orm/downloads/.  If this url doesn’t work or get changed, just search ‘hibernate 4 jars download sourceforge’ in Google.  The distribution version downloaded here is 4.3.11. Except for the version numbers, the jar names and folder structure should be same across any version of hibernate4 distribution.  

 

Hibernate Framework 5 Essentials

This note book will help you to get started with Hibernate 5 like setting up environment, inheritance, mappings, HQL and the Criterial API. 

All the examples in this book is tested with Hibernate version 4.3.11.

Please refer to the hibernate references section to see the reference books that we use for learning and training purposes.

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