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Object Relational Mapping Frameworks

Object Relational Mapping Frameworks. Wiene H öweler. Why ORM frameworks. Maps Object-Oriented programming objects to relational databases Advantages reduce programming code improve performance (caching). ORM frameworks. Open source: Object Relational Bridge Castor Hibernate

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Object Relational Mapping Frameworks

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  1. Object Relational Mapping Frameworks Wiene Höweler

  2. Why ORM frameworks Maps Object-Oriented programming objects to relational databases Advantages • reduce programming code • improve performance (caching)

  3. ORM frameworks Open source: • Object Relational Bridge • Castor • Hibernate • Simple ORM • Ammentos Vendors: • Visual Paradigm for UML • ADF BC (BC4J) • Toplink

  4. Object Relational Bridge • Support of standard and non-standard API's (PB, OTM, ODMG, JDO) • Transparent persistence • Object caching • Optimistic and pessimistic Locking • Allows to build massively distributed and clustered systems • Configurable persistence by reachability • Dynamic XML mapping http://db.apache.org/ojb/

  5. Castor • Castor XML: Java object model to and from XML (XML databinding). • Castor JDO: Java object persistence to RDBMS • In memory caching and write-at-commit • Two phase commit transactions, object rollback and deadlock detection • OQL query mapping to SQL queries http://castor.exolab.org

  6. Hibernate • Support for inheritance, polymorphism, composition and the Java collections framework • A variety of mappings for collections and dependent objects • No build-time bytecode enhancement • Dual-layer cache architecture • Support for "application" transactions http://www.hibernate.org/

  7. Simple ORM • Object/relational mapping on top of JDBC • No XML, 100% Java • Allows for raw JDBC and non-Java database access and constraints without compromising database integrity http://simpleorm.org

  8. Ammentos • Explicitely meant for JDK5 developers • Works with JDK5 annotations • Automatic validation • Event-driven programming supported • Supports inheritance • Supports transactions http://ammentos.biobytes.it/

  9. Visual Paradigm for UML • Model sharing among diagrams • Imports from ROSE • Customizable SQL • EJB diagram support and EJB code generation and deployment • Integrates with Eclipse/IBM WebSphere, JBuilder, NetBeans IDE/Sun ONE, IntelliJ IDEA, JDeveloper and WebLogic Workshop. http://www.visual-paradigm.com/product/vpuml

  10. ADF BC (BC4J) • Lightweight Java classes and corresponding XML-driven bean factories • Declaratively design master/detail UI data model, including only data needed by client for optimum performance • Declaratively enforce required fields, primary key uniqueness, data precision/scale, and foreign key references • Simplify multi-step web-based business transactions with automatic web-tier state management http://www.oracle.com/technology/products/jdev/tips/muench/keybenefits/index.html

  11. Toplink • Offers developers excellent performance and choice, working with any database, any application server, any development toolset and process, and any J2EE architecture. • Allows Oracle hints to specify items such as the join order of a join statement or the optimization approach of a SQL call • Hierarchical queries • Support for Oracle Database Types http://www.oracle.com/technology/products/ias/toplink

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