CSC/ECE 517 Fall 2007/wiki2 2 aa: Difference between revisions
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# [http://en.wikipedia.org/wiki/Object-relational_mapping Wikipedia Definition] | # [http://en.wikipedia.org/wiki/Object-relational_mapping Wikipedia Definition] | ||
# [http://www.chimu.com/publications/objectRelational/part0003.html#E9E3 Object Modeling] | |||
# ORM Thesis[http://digitalcommons.macalester.edu/context/mathcs_honors/article/1006/type/native/viewcontent/] | # ORM Thesis[http://digitalcommons.macalester.edu/context/mathcs_honors/article/1006/type/native/viewcontent/] | ||
# [http://www-128.ibm.com/developerworks/java/library/j-cb03076/index.html Crossing borders: Exploring Active Record ] | # [http://www-128.ibm.com/developerworks/java/library/j-cb03076/index.html Crossing borders: Exploring Active Record ] | ||
Revision as of 15:14, 21 October 2007
Object-relational mapping. Ruby's ActiveRecord is one attempt to allow an object-oriented program to use a relational database. The Crossing Chasms pattern is another. Look up several approaches to mapping relational databases to o-o programs, include hyperlinks to all of them, and explain how they differ. Report on the strengths of various approaches (making sure to credit the authors for their insights).
Introduction
Object-relational Mapping
Object-relational mapping is a programming technique or process to transform data between relational database and a set of data in object-oriented programming.
Implementations
ActiveRecord in Ruby
Crossing Chasms Pattern
Hibernate
Service Data Object
Comparison
In Hibernate, you'd usually begin development by working on your Java objects because Hibernate is a mapping framework. The object model becomes the center of your Hibernate universe. Active Record is a wrapping framework, so you start by creating a database table. The relational schema is the center of your Active Record universe. Active Record also includes some features that many Java frameworks don't have, such as model-based validation.Model-based validation lets you make sure the data within your database stays consistent.
Reference
External Links