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
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
it is an abstraction ofareal word entity in simple terms object is considered as equivalent to E-R models entity Eg: STUDENT ,EMPLOYEE etc
Attributes describe the properties of an object for example object STUDENT may have the sname, rno,marks,mob no etc as attributes.
It is an activity that is performed to access or manipulate the data associated with an object type.
It specifies how an operation is performed on the data associated with an object type
It is an computer implementation of an object type it includes data members and its methods.
It is an ability of an object with in the class hierarchy to inherit the attributes and methods of another class.
- structural independence
- data independence
- data inheritence
- Lack of standards
- Complex navigational data access
- High system overhead slows transactions