OBJECT ORIENTED DATA MODEL

In the object oriented data model both data and their relation ships are contained inasingle structure known as object the OODM is the basis of

OODBMS

A traditional database stores only data not procedures but object oriented database stores the objects an objects contains the data&its related methods the object oriented data model based on the following components

ОВJЕСT:

it is an abstraction ofareal word entity in simple terms object is considered as equivalent to E-R models entity Eg: STUDENT ,EMPLOYEE etc

ATTRIBUTE:

Attributes describe the properties of an object for example object STUDENT may have the sname, rno,marks,mob no etc as attributes.

OPERATION:

It is an activity that is performed to access or manipulate the data associated with an object type.

METHOD:

It specifies how an operation is performed on the data associated with an object type

CLASS:

It is an computer implementation of an object type it includes data members and its methods.

INHERITANCE:

It is an ability of an object with in the class hierarchy to inherit the attributes and methods of another class.

ADVANTAGES:

• structural independence
• data independence
• data inheritence

DISADVANTAGES:

• Lack of standards
• Complex navigational data access
• High system overhead slows transactions