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Student ID: F07421269

Student Name: Yuan Han

Hand in date: 14/12/2007

Database Systems D2

Content

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Introductionpage 1

Database design and implementation.page 1

Logical data structure.........page 8

Data flow diagram..page 9

User guild..page 12

Conclusionpage 18

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Introduction

Unistone Ltd is a dynamic jewellery manufacturer employing 330 staff.

The overall aim of this assignment is to design and implement a database

that holds information about Unistone Ltd production management

system and to analysis how the system works, also to explain how it

makes benefit to the company. A general description of the enterprise,

along with its basic operations and information needs, is contained in this

document.

Database design and implementation:

Nowadays, there are many companies and industries use computer to

help them to manage their business data, therefore the large number of

data is required to be stored safely and effectively. Database system is akey element in this production management system. It helps customers to

easy to know what they are buying and how much they are paying, also it

makes easy comparison to other products; and the main function is to

allows the company to better control with its sales data and information

gathering, and to make a right decision for its business strategy. The

Database management system (DBMS) is in which data is stored in the

form of tables and the relationship among the data is also stored in the

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form of tables.

customers

customerNO Surnname Lastname Age Address Phone Email(primary

key)

Orders

OrderNO ProductNO customerNO Orderdate Quantity

(primary

key)

Product

ProductNO Productname singlePrice

(primary key)

Product Stock Room

ProductNO Quantity(primary key)

According to the activities the company is taking, we can allocate

those tables into two activities pool, which are sales activity and supplyactivity. The tables called customers, order, product, and product stock

room, are used to support for the sales activities contain all the relevant

information and transaction. The customers table is created to include the

details of a single customer with its surname, lastname, age, address,

email address, phone number and a given unique customer number as

fields of the table. The given customer number is set as a primary key.

Therefore, it is unique and based on when searching a specific customer.

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Product table contains all the products the company offer with their

product name, single price and a given unique product number. And the

quality of each product is recorded in product stock room table. Both

tables (product and product stock room) are linked together according to

the unique product number, which is set as primary key in both tables.

The order table records all the sale activities are generated. An order is

made by a specific customer for a specific product. The order table

contains fields of a given order number as a primary key, product number

related to the unique product number in the product table, customer

number related to the unique customer number in the customers table, the

quantity field records the quantity of an product that is made for each

order. The order date records the generation date of the order. Basically,

order table records all the orders, and the details of relevant customers

and products can be gain through searching their customer number and

product number.

Suppliers

SupplierNO Surnname Lastname Address Phone Email(primary

key)

Purchase Material

MaterialNO PurchaseDate Quantity

(primary key)

Raw Material

MaterialNO MaterialName(primary key)

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Material stock room

MaterialNO Quantity

(primary key)

The suppliers, purchase material, raw material, material stock room tables

are used to support the supply activities. Suppliers table contains details

of every single supplier with a unique identification number ----

supplierNO, and its surname, lastname, address, phone number, email

address. Purchase material table records the details of any purchase of

material generation including a given unique purchaseNo, materialNo

tells what material is purchased and material can be identified in raw

material table. Purchase date records the date of purchase and the quantity

records the number of material purchased. Raw material table records

name of materials in the field of materialName, and each material is

given an unique identify number which is recorded in the field called

materialNo. With the same materialNo for each material, the quantity of

each material in stock room is recorded in material stock room table.

Basically, a purchase activity consists of information of supplier,

material, generation date, and quantity of the material for the purchase. In

the purchase material table, materialNo and supplierNo are recorded, and

supplier and material information can be identified through looking up

the materialNo and supplierNo in the material table and supplier table

respectively.

(LDS)

Suppliers

Material

stock room

Product

Orders

Customers

Raw

Material

Purchase

Material

Product

stock room

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This LDS shows the relationship between all factors involved in the

database. From the left top section, a supplier can be involved in many

purchases, and provide many raw materials. However, one purchase may

refer to many raw materials, but one raw material only refers to one

purchase. One material stock room contains many raw materials and one

product may require many different raw materials. Therefore, in the

relationship between raw materials with suppliers, purchase, material

stock room and product are all many to one relationship. From the right

top section, one customer can may many orders, but an order can only

refer to one customer. An order may required many product, and one

product stock room contains many different products. Therefore, on the

graph above, the relationship between product with order and product

stock room both are many to one either.

DFD

Order made

Product sale to

Customer

Custome

rs

1.0Customer check

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Payment made

DFD shows the data process when a customer orders for a product. The

customers information will be checked in the database. If the customer is

existed in the database, its credit rate will be checked and updated after

the sale finish. If the customer is not existed in the database, its

information will be recorded into the database. Afterward, we need to

identify what product the customer requires for. Then, we need to check

the availability of the required product to see if we have enough products

to meet customers requirement. After that, the order is approved to

make. Then the product will be delivering to customer after payment is

2.0

Product check

1.0 customer check

Existingcustomer

1.11

Checkcreditrate1.111

Updatecreditrate1.112

Newcustomer1.12

Insertcustomer details1.121

2.0 product check

2.1Productidentification(Identify theordered

product)

2.2Productavailabilitycheck(comparequantity instock andthe requiredquantity)

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made.

Material supply

Making order

Order finish

Before the company decides to purchase certain material, they have to get

company1.0Material availabilitycheck

supplier

2.0Update materialstock room

1.0 material availability check

Lack of material

1.1Checkmaterial instock room

Makingorder

2.0 update material room

2.1Update thequantity of

purchased materialin material stockroom table

Orderfinish

Identify thesupplier ofthe material

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a signal tells certain material is need. Afterward, identify the supplier of

the material and an order is made to the supplier. After the supplier

receives the order, and process it and supply the material to the company.

When the material is received, database will be updated. Then the order

finish.

User guild:

Home page simply lists 6 options for user to select. The customer detail

enable users to search, update, delete existing customer using query. And

insert new customer by entering relevant information. The product order

links to the details of orders which have been made. Existing orders can

be updated, listed through query, and new orders can be made and save

by entering details. Product in stock links to the page shows details of

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each product including the quantity in stock. They can be listed through

query according to certain criteria. Again, the supplier information allow

user to edit the details of every single supplier including adding new

supplier. The material order links to the page which shows the details of

every single purchase of material. The material in stock is similarly with

the product in stock, it allow users to view the details of every materials.

After clicking on the customer detail, a page called customer information

will be shown. In this page, users are able to list, update and delete

customers by clicking on the query and typing query statement according

to certain criteria. Otherwise, users are able to insert new customers by

clicking on the inset button after filling all the information. The reset

button is used to reset all the text boxes to blank.

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An order may require many of deferent products. When inserting a new

order, there must be a selection of master action which tells how many

products are required in this order. Customers fill the product number,

quantity, and all correlative information of order in this form, then press

insert, the data will be stored in the database, once customer credit has

been checked, and we will shipping the product to customers as soon as

possible.

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Product in stock allows users to update details of product in the stock

room including adding new product, editing and deleting existing

product. The query button allows users to search and list the details of

required product by typing the query statement. The criteria may be based

on the product number or quantity. The insert button allows users to add

new product, a unique product number and the quantity is required.

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It is similar with the customer information page. The insert button allows

users to insert new suppliers. Details of the suppliers are required to enter

(fill all the text boxes). The query button allows users to listed, updated

and deleting existing suppliers.

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New Material order shows how the factory to purchase raw materials,

how many they need to purchase and what material they need. By type in

the gap of material number, material name to choose what kind of

material they want to buy, and insert material number, quantity and

purchase date into the database to let suppliers to know how many of the

material and when they want it. To keep supplier number and purchase

date in the database is good for factorys future use, because factory

always need a better supplier to offer they needs. This is from all aspect

which includes price, quality and credibility.

Conclusion

To sum up, from this course work, I have learned a lot from database

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design; Logical thinking; concept of table; concept of form; concept of

page; concept of primary key and how they link to each other. Also I

have learned some more about how business running in world wide.

Especially on internet, I have known the relationship between customers

and company; the relationship between company and suppliers, and how

they serve to each other.