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Object-oriented call procedure

Oracle Tips by Burleson Consulting

High Performance Data Warehousing

Database Architectures For The 1990s


When a message such as prepare_invoice is called, it may contain sub-behaviors, such as prepare_invoice and compute_charges. The message prepare_invoice directs the system to compute the shipping charges. Different procedures will then be invoked depending on whether the receiving object is a rush_order object or a cod_order object--even though they are both objects within the order class. A rush order would include overnight mail calculations, while the COD order would contain additional computations for the total amount due. This is equivalent to the following procedural language code.

Figure 1.12 An example of polymorphism.

Following is an illustration of the differences between an object-oriented procedure call (a message) and the procedural language equivalent:

* Object-oriented call:


* Procedural language equivalent:

if (rush_order)
compute shipping = tot_amnt * .25
compute shipping = tot_amnt * .10

if (cod_order)
compute tot_due = tot_amnt + shipping
compute tot_due = 0

This is an excerpt from "High Performance Data Warehousing", copyright 1997.

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