All language subtitles for 001 Understand Requirement and Design for User Management Module

Next, we will write code to implement the
functionalities for the user management module

which allows the administrators or managers to manage all the users of the website's back-end

Note that the users here are not the registered users of the website

they are the person who are responsible for managing the website's information in the back-end

the visitors come to the website are called customers

and we will implement the functionalities for customer
management later in this course

here's our task list in this section:

Code UserDAO and unit tests

implement list users feature

implement create user feature

implement edit user feature

and implement delete user feature

This use case diagram represents the actions that a manager or administrator can do to manage users in the system

you see

list all users

create a user

delete a user and edit user

and this is the design of the user management module in our application

the Users List Page

As you can see, there's a hyperlink: Create
New User

to create a new user here

all users in our application are listed on this page

in the table that looks like this

you see

The column names: index, ID, email, full name and action

and each row in the table displays
information for a particular user

and there are action edit and delete for
each user

Our goal in this section is to write code to implement all these functionalities:

list users, create user, edit user and delete user

and this is the design of the table users in the database

the user management module manages data in this table

Note that this table stands alone - it
doesn't have any relationships with other tables

And this class diagram gives you an overview of Java classes which we will code in the user management module

on the server side:

First, we need to update the DAO classes

especially the UserDAO class which implements all database-related
functionalities to manage users

then for each operation: create, list, edit, delete - we create a Java servlet - you see here

CreateUserServlet, ListUserServlet, EditUserServlet, UpdateUserServlet, DeleteUserServlet

to handle requests come from the clients

and the Servlet calls the UserService which in turn, calls the UserDAO

The UserService class encapsulates business functionalities for managing users

a business function may not access to the database

whereas the UserDAO class implements only database-related functionalities

The User class here is simply a domain model class represents a user in the system