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The ODBMS which is an abbreviation for object-oriented database management system is the data model in which data is stored in form of objects, which are instances of classes. These classes and objects together make an object-oriented data model.
Components of Object-Oriented Data Model:
The OODBMS is based on three major components, namely: Object structure, Object classes, and Object identity. These are explained below.
1. Object Structure:
The structure of an object refers to the properties that an object is made up of. These properties of an object are referred to as an attribute. Thus, an object is a real-world entity with certain attributes that makes up the object structure. Also, an object encapsulates the data code into a single unit which in turn provides data abstraction by hiding the implementation details from the user.
The object structure is further composed of three types of components: Messages, Methods, and Variables. These are explained below.
Messages -
A message provides an interface or acts as a communication medium between an object and the outside world. A message can be of two types:
Read-only message: If the invoked method does not change the value of a variable, then the invoking message is said to be a read-only message.
Update message: If the invoked method changes the value of a variable, then the invoking message is said to be an update message.