What is object relational mapping
Definition of orm in wikipedia
Object-relational mapping (ORM, O/RM, and O/R mapping) in computer science is a programming technique for converting data between incompatible type systems in object-oriented programming languages. 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.
Object Role Modeling (ORM) is a powerful method for designing and querying database models at the conceptual level, where the application is described in terms easily understood by non-technical users. In practice, ORM data models often capture more business rules, and are easier to validate and evolve than data models in other approaches.
This site features a number of technical papers and articles on ORM, as well as other approaches such as the Unified Modeling Language (UML). Permission has been obtained from the relevant publishers to reproduce these publications on this website, and to make them freely downloadable. If you are unfamiliar with ORM, you may want to first review the ORM in Detail section of this site. Details about upcoming courses and conferences, as well as links to websites with additional ORM publications may be found in the Resources section.
doctrine power and orm
Object relational mapper (ORM) for PHP that sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernates HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.