Object-Oriented Database Model

Both simple and complex objects can he stored in an object-oriented database model. Earlier data models were designed to store text-based data (which includes numbers). In object-oriented Amu models, other types of data can be stored- For example, video clips or pictures can be stored in an object-oriented database. Object-oriented databases include abstract data types that allow users to define characteristics of the data to he stored when developing an application. This overcomes the limitations of relational databases. Relational databases limit the types of data that can be stored in table columns. Instead of tables, an object-oriented database model stores data in objects.

An object can store attributes (similar to the attributes stored in table columns in a relational database) and instructions for actions that can be performed on the object or its attributes. These instructions are called encapsulated methods ("encapsulated" because they are included as part of the object). Objects can he placed in a hierarchy so that other objects lower in the hierarchy (subclass objects) can obtain (inherit) attributes from objects higher in the hierarchy (superclass objects). Three objects in an object-oriented database model. The superclass object employee provides the same set of attributes to both subclasses—manager and administrator In other words, every manager would have a Name, Address, and employee as would every administrator). Objects are drawn using a rectangle with rounded corners, which is divided into three parts: the object name, the attributes, and any encapsulated methods.

Although many researchers have argued that object-oriented database model are superior to relational object-oriented database models, most organizations still use relational object-oriented database model. The main advantage of an object-oriented model is to store complex data types. In recent years, object-relational databases have been developed. This combined structure includes a relational object-oriented database model framework with the capability to store complex data types. Although developers continue to refine object-oriented database models, most companies seem to be satisfied with relational or object-relational object-oriented database model at this time.

Questionnaire:

• Explain about the object-oriented database model.