Introduction to object-oriented databases

A Review of Object Oriented Database Concepts and their Implementation

“…(Banerjee, et al, 1987A). According some researchers and practitioners, (for example Khoshafian et al (1986), Jackson (1991) and Garvey et al (1989)) an OODBMS should fulfil all the functions which are expected of data base systems, plus others features which are typical in object-orientism. These can be described as follows:…”

“…In OODBMS terms uniqueness is called identity. Khoshafian et al (1986), Jackson (1991) and Garvey et al (1989) all say that identity is that property of an object which distinguishes each object from all others. When real world objects are modelled, it is usually with some particular purpose in mind.…”

“…Inheritance reduces the need to specify redundant information, and simplifies updating. (Garvey, et al (1989)) Information about many object instances can be changed in a single update action.…”

“…Abstract Data Types are defined by Garvey, et al (1989) as data types which allow users to define new data structures. The object-oriented approach enables objects to possess attributes which are themselves objects (Jackson (1991)).…”

“…Others refute this proposition. Khoshafian et al (1986), Jackson (1991) and Garvey et al (1989) all argue that even though some extensions have been made to the relational model,(to overcome some of its limitations) more flexibility is still needed. They propose the Object-Oriented DBMS approach as an alternative to contemporary relational technology.…”