Maintaining Business Rules

1
Maintaining Business Rules

• With Function Hierarchy Diagrammer

2
Overview

• Business rules
• Restrictions that apply to the data set and
  changes in it
• or
• Specific automatic actions that must take place
  after some change in the set of data

3
Business Rules in the Repository

• Not a single Repository object
• Part of the data model
• Uniqueness constraint
• Mandatory relationship
• Part of the descriptive text of functions
• Price Paid may not exceed default price.

4
Declaring Business Rules as Relational
Constraints

• Uniqueness constraint
• Referential constraint
• Integrity constraint
• Non-transferability constraint
• Exclusivity constraint (arc)

5
Business Rules That Cannot Be Expressed as
Relational Constraints

• Members may not rent more than two hot MOVIES
  at the same time.
• Terminated MEMBERSHIPS cannot take out new
  RENTALS.
• MEMBERSHIPS cannot be terminated when they have
  open RENTALS.

6
Documenting More Complex Business Rules

• Pure text
• Related to specific entities or business
  functions
• Coding during build

7
Business Rule as Business Function

• Separate business rule hierarchy
• Can be associated with entities
• Can be associated with other business functions

8
Business Rule Classification
9
Static Data Rule Examples
BusinessRules
Static Data
Attribute
Multiple Attr
Entity
Multiple Entity
10
Data Operation Rule Examples
Data Operation
Create
Update
Delete
Change Event
Authorization
11
Change Event Rule and Authorization Rule Examples
Change Event
Authorization
12
Using the Business Rule Hierarchy

-
Update Rules
Delete Rules

-
Other Delete Rules
Relationship Delete
Delete of Membership only permitted a year after
termination
Price History may not be deleted when Effective
Date is past
13
Creating the Rules
Use FHD or RON
14
The Rule Hierarchy
15
Setting Up the MXD
16
Making the Associations
17
Implementing Rules

• At analysis level, by setting constraints
  Ranges, Allowable Values, FKs
• At DB design level, check constraints.
• At App design level, code modules or packages.

18
Auditing Rules

• Single place to start checking
• Add notes to rules and objects where implemented.
• Use existing or new reports to check.

19
Summary

• Capturing business rules is an important analysis
  task.
• Business rules are modeled
• Within the entity relationship model
• Descriptive texts
• Functions in the Business Rule hierarchy