The construction of Object-Oriented Database Management Systems started in the middle 80 's, at a prototype building level, and at the beginning of the 90 's the first commercial systems appeared. The interest for the development of such systems stems from the need to cover the modeling deficiencies of their predecessors, that is the relational database management systems. They were intended to be used by applications that have to handle big and complex data such as Computer Aided Engineering, Computer Aided Design, and Office Information Systems. <br><br>The area of the OODBMSs is characterized by three things. First, it lacks a common data model. There is no common data model although many proposals can be found in the literature. This is a more general problem of all the object-oriented systems not only the database management systems. Since the data model determines the database language of the system, which in turn determines the implementation of the system, we can understand that the differences between the various systems with different data models can be big and substantial. Second is the common theoretical framework. Although there is no standard object-oriented model, most object-oriented database systems that are operational or under development today share a set of fundamental object-oriented concepts. Therefore the implementation issues in OODBMSs that arise due to these concepts are universal. The third characteristic is that of experimental activity. Plenty of prototypes have been implemented and some of them became commercial products. There is really a need for applications to handle very complex data and that is why the interest of people in building such systems is so strong.<br><br>Although there is no consensus on what an OODBMS is and which are the features that differentiate it from other systems, there has been a lot of effort for an agreement on defining the formal characteristics that can stand as the set of specification requirements for
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Burleson, D.K. Practical Application of Object-Oriented Techniques to Relational Databases. Wiley/QED, 1994.
Chorafas, D.N. and H. Steinmann. Object-Oriented Databases. Prentice-Hall, 1993.
Delobel, C., C. Lecluse, and P. Richard. Databases: From Relational to Object-Oriented Systems. ITP, 1995.
Gray, P.M.D., K.G. Kulkarni, and N.W. Paton. Object-Oriented Databases: A Semantic Data Model Approach. Prentice-Hall, 1992.
should aim to identify which objects are accessed by which of these processes.
Transactional analysis should analyse the transactional requirements of each use-case, and the objects that are accessed in each transaction. Object interaction diagrams are useful in this respect. The OO design phase should include the design of optimal access and index structures to support the navigation paths of the most important use cases, and the concurrency characteristics of the system should be explored with techniques….
C h a p t e r
Object-Oriented Database Development
L E A R N I N G O B J E C T I V E S
After studying this chapter, you should be able to: ● Concisely define each of the following key terms: atomic literal, collection literal, set, bag, list, array, dictionary, structured literal, and extent. ● Create logical object-oriented database schemas using the object definition language (ODL). ● Transform conceptual UML class diagrams to logical ODL schemas by mapping classes (abstract and concrete)….
studies &research Information technology department
(Comparison between Relational database & object oriented database)
By: Mohammed Hussein Mahmoud Mustafa khedr
To: Dr. Saad Darwish
A database is a means of storing information in such a way that information can be retrieved from it. Thus a database is typically a repository for heterogeneous but interrelated pieces of information. Often a database contains more than one table. Codebooks and dictionaries….
Object oriented system development is an approach to system design in which the development process of the entire system is decomposed into smaller independent stages called objects. It is considered to be a partial lifecycle.
Each object and its attributes are abstract entities and is characterized by its functionality. Using the functionality of objects they can further be grouped in classes.
Object oriented system development is characterized by reusability of components i.e. Objects that….
Object-Oriented Requirements Engineering and Management
Joseph E. Kasser DSc, CEng, CM, MIEE Systems Engineering and Evaluation Centre University of South Australia (UniSA) Mawson Lakes South Australia, 5095 Joseph.firstname.lastname@example.org Abstract Object-Oriented requirements engineering is an approach to encapsulating information about the process and product, as well as functionality into a requirements object. This paper identifies properties of a requirement object based on information….
The Object Oriented Model
The object-oriented(OO) model actually had its beginning in the 1970s, but it did not see significant commercial use until the 1990s. This sudden emergence came from the inability of then existing RDBMSs (Relational Database Management Systems) to deal with complex data types such as images, complex drawings, and adio-video files. The sudden explosion of the Internet and the World Wide Web created a sharp demand for mainstream delivery of complex data.
An object is a….
The Three Tenets of Object-Oriented Programming Languages
According to Bjarne Stroustrup, author of the C++ programming language, for a language to call itself object-oriented, it must support three concepts: objects, classes, and inheritance. However, object-oriented languages have come to be more commonly thought of as those languages built on the tripod of encapsulation, inheritance, and polymorphism. The reason for this shift in philosophy is that over the years we've come to realize that encapsulation….
1. What is information systems analysis and design?
Complex organization process, used to develop and maintain computer-based information systems, also it’s used by a team of business and systems professionals.
2. How has a systems analysis and design changed over the past four decades?
1950s: focus on efficient automation of existing processes
1960s: advent of 3gl, faster and more reliable computers
1970s: system development becomes more like an engineering discipline
Who Should Read This Document 5
Organization of This Document 6
See Also 6
Why Objective-C? 7
Object-Oriented Programming 8
Data and Operations 8
Interface and Implementation 9
The Object Model 12
The Messaging Metaphor 13
Mechanisms of Abstraction 18
Class Hierarchies 21
Subclass Definitions 21
Uses of Inheritance….
CS223- Object Oriented Programming
Dr. Fawad Hussain
What we have done so far?
What is object-Oriented Programming?
What is an object?
What is a class?
What are attributes?
What are methods?
How to write a simple class in C++.
But how to identify objects??
Ghulam Ishaq Khan Institute – Spring 2012
Identifying Objects, basics of OO analysis and Design….