Remove a Book

Removing a Book

Interface Definitions:

Inputs to module:

• Call Number of the library book to be removed.

Inputs by user:

• Name of the Book.
• Publisher of the book.
• Year published of the book.

Outputs:

• Confirmation message

"Removing will result in loss of book information. Proceed with Remove?"

Data Abstractions:

CALL NUMBER is a positive integer number.

NAME is a variable length string.

PUBLISHER is a variable length string.

YEAR OF PUBLISHED is a fix length digit string.

Design:

Environment: GUI (graphical user interface)

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

• Every item from Data Abstraction will be entered in it's own text-box.
• These text-boxes will allow strings larger than the text-box size to be entered.
• The remove will be a batch process. i.e. none of the book will be removed until the remove-Book button/key is activated.
• When the button/key is entered certain items will be checked for syntactical errors (for errors see ERROR HANDLING).
• CALL NUMBER will be checked against existing call number.
• NAME will be checked against existing name.
• PUBLISHER will be checked against existing publisher.
• YEAR OF PUBLISHED will be checked against existing year of published.
  

Completion of this module is performed by:

1. Pressing Cancel - in which case no remove is performed.
   • Remove window is closed.
2. Pressing Remove - syntactical error checking is done.
   • Confirmation Window is popped up.

At Confirmation Window:

1. Pressing Cancel - no remove is performed.
   • Confirmation Window is closed.
2. Pressing Remove - remove information.
   • Confirmation Window is closed.
   • Remove window is closed.
   • It will be possible to for user to interrupt this module and do something else. BUT the system cannot close without explicitly completing this module.

Sub-Modules:

• None.

• Error Handling:

Syntactical Errors:

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

THEN give error window:

Text-Box: "Call number is unknown, is the typing correct?"

Buttons: CORRECT, CANCEL

Actions: CORRECT

• Change call number.
• Close window.
• Continue error checking.

CANCEL

• Close window.
• Cancel all completion procedures.
• Return to Remove Window.

• IF name entered does not match any name currently in system.

THEN give error window:

Text-Box: "Name is unknown, is the spelling correct?"

Text-Box: A similarly spelled name (lexicographically) is displayed.

Buttons: CORRECT, CANCEL

Actions: CORRECT

• Change name to suggested one.
• Close window.
• Continue error checking.

CANCEL

• Close window.
• Cancel all completion procedures.
• Return to Remove Window.

• IF publisher entered does not match any format currently in system.

THEN give error window:

Text-Box: "Name of publisher is unknown, is it correct?"

Buttons: CORRECT, CANCEL

Actions: CORRECT

• Change name to suggested one.
• Close window.
• Continue error checking.

CANCEL

• Close window.
• Cancel all completion procedures.
• Return to Remove Window.

• IF year published entered does not match any format currently in system.

THEN give error window:

Text-Box: "Format of year published is unknown, is it correct?"

Buttons: CORRECT, CANCEL

Actions: CORRECT

• Change year published to the correct one.
• Close window.
• Continue error checking.

CANCEL

• Close window.
• Cancel all completion procedures.
• Return to Remove Window.

Empty-Field Errors:

• IF CALL NUMBER field is left empty

THEN give error window:

Text-Box: "A call number MUST be entered!"

Buttons: ADD, CANCEL

Actions: ADD

• Add call number.
• Close window.
• Continue error checking.

CANCEL

• Close window.
• Cancel all completion procedures.
• Return to Remove Window.
• For every other field

• IF field is left empty

THEN give error window:

Text-Box: "Field - "(insert fields name here) "was left empty."

"Continue anyway?"

Buttons: YES, CANCEL

Actions: YES

• Keep blank field.
• Close window.
• Continue error checking.

CANCEL

• Close window.
• Cancel all completion procedures.
• Return to Remove Window.

Imports:

• Library book's information is retrieved from the database on entry into this module.

Exports:

• Library book's information is removed from the database.

Back to the Book Functions Index