The document discusses the history and components of the object-oriented database model. It began with the semantic data model developed by Hammer and McLeod in 1981, which became the basis for the object-oriented data model managed through an object-oriented database management system. In this model, both data and relationships are contained within objects. Objects include attributes that describe properties, classes that group similar objects, and methods that represent actions. Classes are organized in a hierarchy and inheritance allows objects to inherit attributes and methods from parent classes. The unified modeling language uses diagrams to graphically represent systems modeled with the object-oriented approach.

1. OBJECT-ORIENTED
DATABASE MODEL

2. history
The first of this model was the semantic
data model (SDM) developed by M.
Hammer and D. Mcleon and published
in 1981 in their database description
with SDM : A Semantic Database
Model

3.  Since SDM is an object- oriented data
model (OODM). In turn the OODM
becomes the basis for the object
oriented database model with the
manage of through an object oriented
database management system
(OODBMS)

4. OBJECT-ORIENTED
DATABASE MODEL

5.  In the object oriented data model the
(OODM). Both data and their
relationship are contained in a single
structure known us an object.

6.  An object includes information about
relationship between the facts within
the object, as well as information
about its relationship with other
objects.

7. It is said to be ‘’SEMANTIC DATA
MODEL’’

8. The OO Data model components
 An object is the abstraction of the real-
word entity. An object represents only one
occurrence of entity.

9.  Attributes describe the property of an
object.

10. PERSON
NAME
SOCIAL NUMBER
DATE OF BIRTH

11.  Objects that are similar in
characteristics are grouped in class.

12.  Class: is a collection of similar objects
with shared structure ( attributes) and
behavior (method)
 Method: represents areal word action
such as finding a selected person’s
name, changing person’s name or
printing a persons address.

13.  Classes are organized in class
hierarchy. The class hierarchy
resembles an up side down tree in
which each class has only one parent.

14. PARENT PERSON
COTUMER
EMPLOYEE

15.  Inheritance is the ability of an object
within the class hierarchy to inherit the
attributes and methods of the class
above it.

17.  Unified modeling language : describes
a set of diagrams and symbols that
can be used to graphically model a
system.

18.  UML class diagram: are used to
represent data and their relationships
within the larger UML object oriented
system modeling language,

20.  The object representation of the
invoice includes all related objects
within the same box. The
connectivity is (1 and many)indicate
the relationship of the related
objects to the invoice.

21. The end!!!!!!!