Beihang Software Engineering Library Management System Personal Operation Documents

Design Document of Library Management System

GITHUB connection

Development environment

• win10
• IDEA2019
• MAVEN
• TOMCAT9
• Mysql 8.0
• SpringMVC framework
• The front end uses bootstrap rendering
• UML system abstraction

Application background

Design a book borrowing management system for book management. If you want to borrow a book, students log in to the system and submit the book you want to borrow. If you want to return the book, the student logs in to the system to confirm the return of the book, the system calculates whether it is overdue, and if it is overdue, a fine is displayed. In addition, students can donate books to the library.

Librarians can check the status of all books borrowed by students, and can also modify the information of books and add or delete books.

demand analysis

To design a small library management system, the following functions need to be provided:

• Input data for legality verification
• The database password field should be encrypted
• Enter the student ID and return to the student loan list
• Enter [book title], you can borrow books
• Click the Book Return button to return the book.

Database abstraction

student

As a type of entity in the database, it has the following three types of attributes:

• Student ID [int type primary key]
• Name 【varchar类型】
• Password 【varchar类型】

Create a new student table in the database to manage student information.

books

As a type of entity in the database, it has the following three types of attributes:

• Book number [int primary key]
• Title 【varchar】
• Quantity 【varchar】
• Book description 【varchar】

Create a new book table in the database to manage books.

Borrowing table

According to BCNFthe design principles, to eliminate the transfer function dependence and partial function dependence of the non-main attribute of the database on the main attribute, a new borrowing table is needed to save the library's borrowing information.

• stu_id: Identify the borrowing user, foreign key constraint

• book_id: Identifies the book number borrowed, foreign key constraint

• timestamp: Borrowing time

System abstraction

The following is a systematic abstract modeling of the library in terms of class diagrams, use case diagrams, sequence diagrams, activity diagrams, and state diagrams, each of which represents a different perspective or viewpoint.

Class Diagram

Describe the object classes in the system and the relationships between classes

Class diagram description:

It can be seen that this is a layered architecture: the bottom pojolayer is responsible for packaging the data in the database, the DAO(Data Access Object)layer covers the addition, deletion and modification of the database, the service layer is used to realize the business, and the controller layer receives the front-end request and executes the corresponding business.

• pojoLayer: Each class corresponds to a table in the database
• DAOLayer: Contains two interfaces for operating students and books.
• Service layer: composed of DAO layers
• Controller layer: It is formed by aggregation of service layer.

Use case diagram

Describe the interaction between the system and its environment

Participants	Ordinary users, administrators
description:	Readers: You can query book information and donate books through the Internet, and readers can borrow and return books. Ordinary administrator: manage the back-end library, reader library, and database.
data:	Number, title, description of books; borrowing of books
Trigger mechanism	Participants make requests
response	Confirmation information that the library management system has been updated

Timing diagram

Describe the interaction between the participant and the system directly and the system construction

Ordinary user operation sequence :

• Readers log in to the reader account:

  First execute the login () method to enter the user name and password, and execute the checkId () method to verify the correctness of the user name. If illegal characters are entered, login failure will be returned; if it is correct, the checkPassword () method will continue to be executed; if the password is entered incorrectly, login failure will be returned. If the password is correct, the login is successful.

• Query new books in storage:

  Readers can search for new books in the library by using the book title.

• Borrow a book

  Readers can choose to borrow books or renew books when borrowing books; when borrowing books, readers query the desired books and use the gotoBorrowBook()jump to borrowBook()method to generate borrowing records. If the loan is successful, the loan record will be generated successfully. If the inventory is insufficient, the loan will be returned;

• Return books

  Book Return: Readers return books, which are divided into normal book return and abnormal book return. When the book is returned normally, the reader queries the book record and selects the book to be returned. First, the gotoreturn()method call returnBook()method is executed to delete the book record. If it is normal, the book return is successful and a book return record is generated. If overdue, you need to pay a fine before you can return the book.

• Enquire about personal borrowing

  Readers query personal information, first execute the queryBookByStu()method to query the book that the individual has borrowed.

Librarian's operation sequence:

• New book storage

  After logging in to the system, the librarian chooses to add the book function and start the execution gotoAddBook()method. This method will call the New_Book class to addBook()add the new book.

• Obsolete

  Click the delete button on the front-end interface and the background controller will execute the deleteBook()method to delete the book.

• Book update

  The administrator has the authority to execute the updateBook()method to update the book information.

• View reader subscriptions

  Select to view the reader subscription, that is, the implementation queryBookByStumethod, that is, to obtain the corresponding reader subscription information.

Activity diagram

Describe the activities involved in the process or data processing

State diagram

Describe how the system responds to external events

、

Instructions for use

general user

After the system is running, first enter the user login interface, the user login interface, unregistered users need to register first.

registered

Click to Registerenter the registration page and fill in the relevant information to register. After successful registration, return to the login interface.

log in

Enter the user name and password and click login, select remember meto remember the account password.

Borrow a book

Search by book title keywords, select to borrow books.

Return books

To read your own reader information and books you have borrowed, click Return.

Administrator user

Use the following administrator user idand pwdlog in:

id:17373290
pwd:root

log in

New book

Click Add Book on the main interface of the book management, and then enter the book information.

Delete book

Click Delete on the book display page to delete the book. If there are still students borrowing the book, the deletion will fail and the request will be intercepted by the interceptor.

Modify book information

Click Update on the book display page to modify the book information.

Check student borrowing

Enter the student ID to query all books borrowed by the student.

System deployment instructions

To start the mysql database, you need to use administrator rights

Start idea

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Connect to the database: make sure the user and password are filled in correctly

Start TOMCAT: need to pay attention to add dependency package to the project structure, MAVEN will not automatically add.

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Code statistics

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Language                     files          blank        comment           code
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Java                            18            193             46            844
JSP                              9             62             44            558
XML                              8             34             42            207
Maven                            1              3              0             44
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SUM:                            36            292            132           1653
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SUM: 36 292 132 1653