Abstract

Object-relational mapping (ORM) in computer software is a programming technique for converting data between incompatible type systems in relational databases and object-oriented programming languages. ORM technologies mediates between object oriented architecture system and relational environment; it is a solution for paradigm mismatch. This creates, in effect, a "virtual object database" that can be used from within the programming language. There are both free and commercial packages available that perform object-relational mapping, although some programmers opt to create their own ORM tools. The ORM approach was first realized in Hibernate, an open source project for Java systems started in 2002, which will be introduced here.

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