Management Functions

Enter New Employee
- Inputs:
  - employee ID
  - employee first name
  - employee last name
  - employee password
  - employee type
- Outputs:
  - new instance of employee added to database
- Errors:
  - employee ID already being used
  - employee password already being used
  - employee type invalid
Delete employee
- Inputs:
  - employee ID
- Outpus:
  - employee record removed from database
- Error Conditions:
  - employee ID doesn't exist
  - syntacticallly incorrect input
Modify Employee Information
- Inputs:
  - employee first name
  - employee last name
  - employee password
  - employee type
- Outputs:
  - instance of employee record modified accordingly
- Error Conditions:
  - syntactically incorrect inputs
  - password invalid
  - employee type invalid
Remove Old Invoices
- Inputs:
  - invoice number
- Outputs:
  - instance of invoice deleted from database
- Error Conditions:
  - syntactically incorrect input
  - invoice number doesn't exist
Remove Items From Bill
- Inputs:
  - invoice number
  - item ID
- Outputs:
  - item removed from customer bill
- Error Conditions:
  - syntactically incorrect input
  - invoice number doesn't exist
  - item number doesn't exist
Add New Item to Fees
- Inputs:
  - item ID
  - name of item
  - cost per unit
- Outputs:
  - new item added to the datastore
- Error Conditions:
  - item ID already being used
  - syntactically incorrect input
Delete Item from Fees
- Inputs:
  - item ID
- Outputs:
  - delete item from database
- Error Conditions:
  - item ID doesn't exist
  - syntactically incorrect input
Modify Item in Fees
- Inputs:
  - item ID
  - name of item
  - cost per unit
- Outputs:
  - instance of item modified in datastore
- Error Conditions:
  - item ID doesn't exist
  - syntactically incorrect input

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