Object-relational database

An object -relational database (short ORDB ), and object- relational database management system (short ORDBMS ) called represents the link between classical relational databases and object databases; they come in all applications where need to be brought sets of objects in relation to other data or objects.

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Between the relational and object-oriented data models, there are many correspondences, the entity corresponding to the object and the entity type of the class. This base has led to the development of object-relational DBMS that have a language extension to object-oriented methods and data types for the improvement of the relational model, and thus led to the handling of complex structured data.

Often, an object-oriented access layer is placed above a relational database. Some access layers, the objects and their attributes are only loaded when they are needed in the application.

Areas of application include systems for acquiring geographical information ( GIS), which coordinates are associated with each other or other data references. For example, reference several objects coordinate a road: the coordinates are in relation to a street name and are themselves objects that have a relationship to each other.