Chapter No. 3 Designing the Project

CHAPTER 3

Designing the Project

3.1 Introduction

In order to design a web site, the relational database must be designed first. Conceptual design can be divided into two parts: The data model and the process model. The data model focuses on what data should be stored in the database while the process model deals with how the data is processed. To put this in the context of the relational database, the data model is used to design the relational tables. The process model is used to design the queries that will access and perform operations on those tables.

3.2 Purpose Purpose is to: Understand a system.

Understand the different phases of system developments life cycle.

Know the components of system analysis.

Know the components of system designing.

3.3 ScopeMy focus is to develop and design the complete online website according to requirements. In designing phase I develop complete user side and as well as admin site for users and administrator simultaneously. In designing phase back end coding is most important by which we develop our graphical site. So, my scope is to design and develop my website completely.

3.4 Activity Diagrams

System Flow for Admin

Here is the flow of login into system for administrator.S SYS

Sys

Fig 3.1 System Flow for Admin

System Flow for Customer

Fig 3.2 System Flow for Customer3.5 Architectural Representation (Architecture Diagram)3.5.1 Data Flow Diagram

First Level DFD for Admin

First Level DFD for Customer

3.6 Class DiagramClass diagram depicts the attributes and functions of the classes used in the system.

3.7 Entity Relationship Diagram

Entity relationship diagram depicts the different entities and The relationships among them.

3.8 Sequence Diagrams

Login sequence for admin

Fig 3.3 Sequence Diagram for login

User Diagram for View Products.

Fig 3.4 Sequence Diagram for View Products

Customer Diagram for Register him.

Fig 3.5 Sequence Diagram for Customer Registration

Customer Diagram for View Products.

Fig 3.6 Sequence Diagram for Customer to View Products

Administrator diagram for Add, Delete and View user and Customer.

Fig 3.7 Sequence Diagram for Administrator to Add, Delete and View user and Customer Administrator diagram for Add, Delete and View product.

Fig 3.8 Sequence Diagram for Administrator to Add, Delete and View Products3.9 Deployment Diagram

Rapid application development is a software development methodology, which involves iterative development and the construction of prototypes. It is a merger of various structured techniques, especially the data driven Information Engineering with prototyping techniques to accelerate software systems development. We use RAD Model when Requirements are clear.

Fig 3.9 Rapid Application Development Model (RAD) Advantages of the RAD methodology There are following advantages of RAD Flexible and adaptable to changes.

RAD generally incorporates short development cycles - users see the RAD product quickly. RAD involves user participation thereby increasing chances of early user community acceptance.

RAD realizes an overall reduction in project risk.

A system

Fig 3.10 system diagram3.10 Database Model (Database Diagrams)

The database diagrams and table design show all the database Model which given as below.

SQL SERVER

SQL SERVER 2012 is used in this online application. DATABASEA database is a structured collection of data. Data refers to the characteristics of people, things and events. SQL server stores each data item in its own fields. In SQL Server, the fields relating to a particular person, ting or event are handled together to form a single complete unit of data, called a record (it can also be referred to as raw or an occurrence). Each record id made up of a number of fields. No two fields in a record can have the same field name.

During an SQL Server Database design project, the analysis of your business needs identifies all the fields or attributes of interest. If your business needs change over time, you define any additional fields or change the definition of existing fields.

SQL Server Tables

SQL Server stores records related to each other in a table. Different tables are created for the various groups of information. Related tables are grouped together to form a database.

Primary Key

Every table in SQL Server has a field or combination of fields that uniquely identifies each record in the table. The unique identifier is called the Primary Key. or simple the Key. The primary key provides the means to distinguish one record from all other in a table. It allows the user and the database system to identify, locate and refer to one particular record in the database.

Relational DatabaseSometimes all the information of interest to a business operation can be stored in a one table. SQL Server makes it very easy to link the data in multiple tables. Matching an employee to the department in which they work is one example.

Foreign Key

When a field in the one table matches the primary key of another field is referred to as a foreign key. A foreign is a field or group of fields in one table whose values match those of the primary key of another table.

Referential Integrity

Note only those SQL Server allow you to link multiple tables, it also maintains consistency between them. Ensuring that the data among related tables is correctly matched is referred to as maintaining referential integrity.

Data Abstraction

A major purpose of a database system is to provide users with an abstract view of the data. This system hides certain details of how the data is stored and maintained.

TablesThere are following tables that are designed for this online application:3.9.1 Admin Login.

Table 3.1

3.9.2 Customer.

Table 3.2

3.9.3 Product.

Table 3.3

3.9.4 Product Category.

Table 3.4

3.9.5 Product Groups

.

Table 3.5 3.7.6 Post a job.

Table 3.6 3.9.7 Job Category.

Table 3.7

3.9.8 Job Group.

Table 3.8

3.9.9 Comments.

Table 3.9

3.11 Graphical User InterfaceThe graphical user interface provides the ways to user to interact with the system easily.Admin Login

Admin provides User Id and password then click on login button for login.

Admin Area

In this area admin can perform all the actions that are suitable.

Home PageHome page displays Ads to the guest user and link for registration and also area for user login.

Products Detail page

This page displays the whole detail of ads and also the comments.

Customer Area

Here the registered users (customers) can post, update and delete their own Ads.

User Registration PageA guest/visitor can become the user/customer of the website by the following form.

Post Ads Page

Here the user/customer posts ads by providing the following information.Post Job Page

Here the user/customer can posts the jobs ads by filling the following form.About US Page

This page describes the vision and mission of the application.Contact Us Page

This page provides the contact information for the users to administrator.

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