Lend a Book

Lend Book

Interface Definitions:

Inputs to module:

1. Call number of a book,
2. Identification number of a borrower.

Outputs to user:

1. Confirmation messages,
2. Fines information (from data store FINE), which includes the following :
   • Outstanding fines
   • Books currently out
   • Overdue books.
   • Due dates.

Data Abstractions:

CALL NUMBER is an integer.

IDENTIFICATION NUMBER is an integer.

CONFIRMATION MESSAGES is a variable length string.

BORROWER INFORMATION is a variable length string.

OUTSTANDING FINES of type currency.

BOOKS CURRENTLY OUT of type integer.

OVERDUE BOOKS of type integer.

DUE DATES is of type date.

Design:

Environment: GUI (graphical user interface)

Interface: Pop-up window. (See picture files for a view.)

The Identification number can be entered into a list-box and by clicking the OK button, the system takes over and checks for possible input errors.

If there are no errors after this stage, the system will retrieve the necessary borrower database information and display the following information:

• Outstanding fines
• Books currently out
• Overdue books.

If there are no outstanding fines nor overdue books, then the librarian can enter the book call number.

All book and borrower attributes are automatically updated at this point. Things to update are :

• Due date of book
• Status of book
• Books currently on loan to borrower.

Note Also:

If the book is not listed as being signed out the user will be notified. The user will be informed of any invalid entries that were made. It will also suggest a valid format type.

Sub-Module:

Place Book On Hold

Inputs to module:

• Call number
• Identification number.

Outputs to user:

• Confirmation messages.

Data Abstractions:

CALL NUMBER is an integer.

IDENTIFICATION NUMBER is an integer.

CONFIRMATION MESSAGES is a variable length string.

Design:

Environment: GUI (graphical user interface)

Interface: Pop-up window. (See picture files for a view.)

Librarian can just enter the call number and the identification number into a list-box and if successful, a confirmation message will be displayed.

Sub-Modules:

• None

Error Handling:

• see below for call number and identification number error handling procedure.

Error-Handling:

Syntactical Errors:

• IF identification number entered does not match any currently in system.

THEN give error window:

Text-Box: "Identification number doesn't exist in, re-enter?"

Buttons: YES, NO

Actions: YES

• User will be back to the previous screen.
• User will be back to the main screen.
  

• IF number entered is syntactically incorrect.

THEN give error window:

Text-Box: "Identification number is syntactically incorrect. Must be N digits. Re-enter?"

Buttons: YES, NO

Actions: YES

• User will be back to the previous screen.
• User will be back to the main lend book screen.

• IF borrower has outstanding violations.

THEN give error window:

Text-Box: "Borrower has X violations. Transaction cannot proceed."

Buttons: OK

Actions: OK

• User will be back to the main lend book screen.

• IF call number entered does not exist.

THEN give error window:

Text-Box: "Call number doesn't exist in database, reenter?"

Buttons: YES, NO

Actions: YES

• User will be back to the previous screen.
• User will be back to the main screen.

• IF call number entered is syntactically incorrect.

THEN give error window:

Text-Box: "Call number is syntactically incorrect. Must be in x-format integer. Re-enter?"

Buttons: YES, NO

Actions: YES

• User will be back to the previous screen.
• User will be back to the main lend book screen.
  

• IF book is on hold.

THEN give error window:

Text-Box: "Book requested is currently on hold. Place a hold on the book?"

Buttons: YES, NO

Actions: YES

• Program will jump to Hold book sub-module.

Actions: NO

• User will be back to the main lend book screen.
  

• IF book is non-circulating.

THEN give error window:

Text-Box: "Book requested is non-circulating. Transaction cannot proceed."

Buttons: OK

Actions: OK

• User will be back to the main lend book screen.

Imports:

• Borrower's old information is retrieved from the database on entry into this module.

Exports:

• Borrower's new information is entered into the database.
• Book's new information is entered into the database.

Back to the Book Functions Index