2.5.5-2.6.4

2.5.5-2.6.4 - Currently object oriented programming gain significant attention It appeared long time ago and was offering a natural modeling of the

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1 Currently object oriented programming gain significant attention. It appeared long time ago and was offering a natural modeling of the real world however, it was not so used because it required more resources. Now, as the computer resources are cheap, but the human resources are expensive, the object oriented paradigm is very used. It was also adopted in database modeling. There are 2 new systems developed: a pure object oriented DBMS (OODBMS) and an extension of the current relational databases named Object Relational DBMS (ORDBMS). In the object oriented paradigm we have objects, which represent entities from the real-world. They contain the data describing the object, the relationships between the object and other objects and the methods to process the objects. It is a self- contained structure, keeping everything and managing everything it need.
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2 For instance we have the following representation of an INVOICE. In the Entity Relationship model (ERM), from the right hand side of the picture, the invoice will be generated by a customer and will contain several line-items. Also it would have number, date, ship data and total cost. There are 3 entities: CUSTOMER, INVOICE and
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This note was uploaded on 01/22/2011 for the course IT 214 taught by Professor Staff during the Spring '08 term at George Mason.

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2.5.5-2.6.4 - Currently object oriented programming gain significant attention It appeared long time ago and was offering a natural modeling of the

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