You can design one procedure to combine all maintenance functions. On the screen, attributes provide different field protections for the different Add, Change, Delete and Display functions. Whenever detail field changes are needed in the design, only one screen needs to be modified.
Some field level protections that an online application might use are listed in the following table.
|
Function |
Attribute Type |
Protection |
Comment |
|---|---|---|---|
|
Add |
Identifier Non-identifier |
Unprotected Unprotected |
Sometimes the identifier is automatically generated, in which case the identifier would be protected. |
|
Delete |
Identifier Non-identifier |
Protected Protected |
The only enterable field is usually a Y/N to confirm delete. |
|
Update |
Identifier Non-identifier |
Protected Unprotected |
Anything except the identifier can be changed, providing the result of the change still conforms to business and data integrity rules. |
|
Display |
Identifier Non-identifier |
Unprotected Protected |
Only the identifier can be entered to select an occurrence. |
|
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