Answered: Consider the case of calculating the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Consider the case of calculating the price of all the products in an customer order. A sequence diagram can provide the information starting from the method “calculating_ the_price”. Hint:

- define the objects that are needed so that starting from an order (initial object) to find out the prices of the items and then the total.

- starting from an instance of the order define the messages that are passed between the objects in that use case. Example: from the order the messages: get_quantity , get_item are sent to the next object (order_line).

- after that there are other sequence messages for the prices (get_prices).

- after having done that for all the items the order needs to compute an overall discount (compute_discount).

- the method: get_discount_info is invoked and the discount is sent to the customer.

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