Course Description:

Fast Track to Hibernate: Using Hibernate For Java Database Access

Hibernate is an open source object/relational (OR) persistence and query service for Java. Hibernate lets you develop persistent classes following common Java idioms - including association, inheritance, polymorphism, composition and the Java collections framework.

The Hibernate Query Language, designed as a minimal object-oriented extension to SQL, provides an elegant bridge between the object and relational worlds. Hibernate also allows you to express queries using native SQL or Java-based Criteria and Example queries.

Hibernate is now the most popular OR mapping solutions for Java, and it has become a de facto standard in Java OR mapping. JBoss has integrated Hibernate into its JEMS (Java Enterprise Middleware System) product line.

The Java Persistence API (EJB 3) specification derives a great deal of its architecture from Hibernate, and the Hibernate annotations are compatible with the Java Persistence annotations. This promises to make Hibernate an even more important technology.

This course covers everything you need to know to begin working with Hibernate in a very short time. It covers all the important concepts necessary to access and update data stored in relational databases. It includes an extensive series of labs to exercise all major capabilities.

All labs are done with the Eclipse IDE Java EE version, and the lab instructions include detailed directions for using it. It is also available for other major IDEs, such as IntelliJ IDEA.

Course Information

Duration: 3 days

Hands-on: 50% hands-on, 50% lecture

Supported Platforms: Java 5, Java 6, Eclipse, IntelliJ IDEA, other major platforms

Skills Gained:

Understand the benefits of Hibernate
Understand the Hibernate architecture
Create Hibernate based applications
Understand and use Hibernate mapping to map persistent objects to the database
Understand and work with collections & associations
- Value and Entity Types
- Bidrectional and unidirectional
- 1-1, 1-N, N-N
Use Hibernate's versioning support
Map inheritance hierarchies using Hibernate
Work with Hibernate queries, HQL, and Criteria
Performance tune your Hibernate applications
Understand Hibernate transaction support
Understand the relationship between Hibernate and Java Persistence / EJB 3
Use the new Hibernate annotations to do OR mapping

Course Details:

Session 1: Introduction to Hibernate

Issues with Persistence layers and Object-Relational Mapping (ORM)
Hibernate Overview and Benefits
Hibernate architecture overview
Configuring Hibernate
- hibernate.cfg.xml file, Connection properties, Database dialect
- SessionFactory, Configuration, and Session
Mapping a Class
- Persistent Entity Class, Hibernate Mapping File, Mapping the Entity Class
- Primary keys: Id property, Generated Id
- Hibernate Type System
Working with sessions and Persistent Objects
Logging: hibernate.show_sql, log4j Overview and configuration for Hibernate

Session 2: Updates and Queries

Inserting, Updating, and Deleting Entities
HQL - Hibernate Query Language Overview
The Query Interface
Creating and working with queries
Named Queries, Projection Queries, Aggregate Queries

Session 3: The Persistence Lifecycle

Transaction Overview and Transactions in Hibernate
Hibernate Transaction API (in Managed and Non-managed Environments)
The lifecycle of managed objects
Persistent, transient, and detached objects
The Persistence (Session) Context (Lifespan, Relation to Managed Objects, Propagation)
Contextual Sessions
Synchronization to the Database
The Session as cache
Optimistic Locking / Versioning
- Detached Objects and Optimistic Locking
- Versioning overview and Using Versioning
- Locking Objects

Session 4: Relationships

Object Relationship Overview
Mapping Collections of Value Objects
Entity Relationships: 1-N, N-1, N-N, 1-1
Mapping Entity Relationships
Uni and Bi-directional Relationships
The Relationship "inverse"
Cascading Over Relationships
Queries Across Relationships (Lazy and Eager)
Inheritance Mapping
- Entity Inheritance with Hibernate
- Table-per-class mapping
- Table per Subclass mapping
- Table per Concrete Class mapping

Session 5: Additional Querying Capabilities

Projection Queries, Aggregate queries, Bulk updates and deletes, Native SQL Queries,
Query Filters
The Criteria API
- Overview of the Criteria API
- Working Querying with the Criteria API
- Query by Example

Session 6: Hibernate and Java Persistence / EJB 3

Overview of Java Persistence / EJB 3
Relationship between Java Persistence and Hibernate
Mapping Entities with JPA Annotations
The EntityManager, Persistence Context and Persistence Unit
Working with Transactions - EntityTransaction, Managed, and Unmanaged Environments
Inserts and Updates
JPQL - Java Persistence Query Language
Versioning
Relationships

Session 7: Advanced Topics

Components and Multi-Table Mapping
equals() and hashCode()
Caching and Efficiency
Design Considerations