Object-relational mapping (ORM, O/RM, and O/R mapping) in computer software is a programming technique for converting data between incompatible type systems in relational databases and object-oriented programming languages.
From: http://en.wikipedia.org/wiki/Object-relational_mapping
หากมีเวลาก็ทดลองใช้งาน ORM ต่างๆ ได้