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Hibernate & Design Patterns A Practical Overview

Hibernate & Design Patterns A Practical Overview. BSc . Thiago Oliveira Technical Manager Galileo Team Coimbra, April 14 th , 2009. Agenda. Design Patterns Transfer Objects Data Transfer Objects Factories Hibernate Framework Connecting the pieces. PART I Design Patterns & Hibernate.

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Hibernate & Design Patterns A Practical Overview

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  1. Hibernate & Design PatternsA Practical Overview BSc. Thiago Oliveira Technical Manager Galileo Team Coimbra, April 14th, 2009

  2. Agenda • Design Patterns • Transfer Objects • Data Transfer Objects • Factories • Hibernate Framework • Connecting the pieces

  3. PART IDesign Patterns & Hibernate

  4. What Are Design Patterns? • In the simplest term, it’s a solution to a design problem in particular field • It’s define the problem, the solution, when apply it and what are the consequences

  5. Transfer Objects

  6. Transfer Objects • A Transfer Object is just a Serializable POJO (Plain Old Java Object) • Also called Persistent POJO or Valuable Object

  7. ResourceTO code Indentify Class “Version”. Calculated Hash using the attributes names and methods signatures. It’s not a random number!

  8. Updatable Transfer Object Strategy

  9. Data Access Objects

  10. Data Access Objects

  11. Data Access Objects • Implement the CRUD operations: • public intinsertResource(…) • public booleandeleteResource(…) • public ResourceTOfindResource(…) • public booleanupdateResource(…) …

  12. DAO – We want more flexibility Abstract Factory Concrete Factory DAO – Implements the operation for a specific Entity

  13. Hibernate Framework • Hibernate is a object/relational mapping (ORM) tool for Java • Hibernates goal is to relieve the developer from 95% of common data persistence related programming task • Last Release: 3.3.1 GA

  14. Hibernate Framework • It provides: • Mapping from Java Objects to Relational Tables • Automatic conversion from Java Types to SQL Types • Data Query and retrieve facilities that can reduce the time effort of development • Sophisticated Query Options you can use pure SQL or HQL (Hibernate Query Language )

  15. Hibernate Framework • It provides: • Transparent Persistence • SQL generation • Support for Transaction

  16. How this magic became true? Through XML Configuration Files and powerful API • Hibernate Conf File (hibernate.cfg.xml) • Mapping Files (myClass.hbm.xml)

  17. A connection configuration filehibernate.cfg.xml

  18. We don’t want to write any single configuration file by hand… • JBoss Tools is a set of plugins for Eclipse for support JBoss and related technology, like Hibernate • The actual stable release is the JBoss Tools 3.0.0.GA, requires Eclipse Ganymede 3.4.2

  19. Hibernate Tools for Hibernate 3.0 • Key Features • Code Generation • Wizards for creation of common Hibernate files • Support auto-completion and syntax highlighting

  20. PART IIConnecting the Pieces

  21. Just Remembering

  22. A Simple ER

  23. A Employee Hibernate Mapping FileEmployeeTO.hbm.xml

  24. Yes, I Know… You want to see code…DepartmentDAO - Interface

  25. Yes, I Know… You want to see code…EmployeeDAO - Interface

  26. Yes, I Know… You want to see code…HbmDepartmentDAO – A concrete DAO

  27. Yes, I Know… You want to see code…HbmDAOFactory – A Concrete Factory

  28. Yes, I Know… You want to see code…DAOFactory – An Abstract Factory

  29. So we got a workspace structure like this…

  30. Ok, That’s beautiful… How do I use it?

  31. A deeper look attestInsertDepartment()

  32. A deeper look attestFindDepartmentById()

  33. A deeper look attestListDepartments()

  34. A deeper look attestFindDepartmentByName()

  35. A deeper look attestUpdateDepartment()

  36. A deeper look attestDeleteDepartment()

  37. Further Reading • More about Hibernate & HSQL • Hibernate Reference Document (http://www.hibernate.org/hib_docs/v3/reference/en/pdf/hibernate_reference.pdf ) • BAUER, Christian; KING, Gavin. Java Persistence with Hibernate. Manning Publications Co: New York, 2007 • More about Data Access Objects • Core J2EE Patterns - Data Access Objects (http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html ) • More about Transfer Objects • Core J2EE Patterns - Transfer Objects (http://java.sun.com/blueprints/corej2eepatterns/Patterns/TransferObject.html )

  38. Further Reading • More about Junit • Unit testing with JUnit 4.x and EasyMock in Eclipse (http://www.vogella.de/articles/JUnit/article.html ) • Junit 4.x How to (http://pub.admc.com/howtos/junit4x/junit4x.pdf) • More about Hibernate Tools • Hibernate Tools Reference Guide (http://docs.jboss.org/tools/3.0.0.GA/en/hibernatetools/pdf/Hibernatetools_Reference_Guide.pdf)

  39. BSc. Thiago OliveiraTechnical Managerthiagosilvaoliveira@gmail.com

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