CSC/ECE 517 Fall 2009/wiki3 12 sn

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Patterns for Mapping Objects to Relational Databases

Introduction

Mapping Objects to Relational Databases is also referred to as Object-relational mapping or ORM. It is a programming technique for converting data between incompatible type systems in relational databases and object-oriented programming languages which creates a virtual object database that can be used from within the programming language [1]. The term "mapping" is used to refer to how objects and their relationships are mapped to the tables and relationships between them in a database [2].

Fundamentals of Mapping

To determine the simplest form of mapping we must start with the class whose objects need to be mapped. An attribute of such a class will then be mapped to a single or multiple columns of a relational database table.


References

[1] http://en.wikipedia.org/wiki/Object-relational_database
[2] http://www.agiledata.org/essays/mappingObjects.html

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