TAILIEUCHUNG - PATTERNS OF DATA MODELING- P32

PATTERNS OF DATA MODELING- P32: Models provide the means for building quality software in a predictable manner. Models let developers think deeply about software and cope with large size and complexity. Developers can think abstractly before becoming enmeshed in the details of writing code. Although models are beneficial, they can be difficult to construct. That is where patterns come in. Patterns provide building blocks that help developers construct models faster and better. | Product 139 Figure Archetype Position UML model. A Position is a job held by someone in an organization. PositionLink Organization organizationID i positionLinkID effectiveDate expirationDate parentPositionID FK childPositionlD FK i MgmtHierarchy mgmtHierarchylD effectiveDate expirationDate rootPositionlD FK organizationID FK Position Assignment Person positionlD title effectiveDate expirationDate ---- assignmentID personlD effectiveDate expirationDate positionID FK personID FK Figure Archetype Position IDEF1X model. tended . In reality at most one Person can hold a Position at a time and application code must enforce this constraint. The model does not require that the position structure be a hierarchy although that is the usual case. The model instead supports matrix management a Position may report to multiple parent Positions . Product A Product is the packaging of a physical item for a particular marketplace Figure Figure . For example a bank can have a checking account service and tailor the service into products for various markets. One product might be an interest-bearing checking account. Another might couple a checking account with discounts for various businesses. A third product might have low fees for students. A product can consist of multiple items. 140 Chapter 10 Archetypes Figure Archetype Product UML model. A Product is the packaging of a physical item for a particular marketplace. PhysicalItem PhysItem_Product Product Vendor Figure Archetype Product IDEF1X model. Role A Role is a function played by someone or something Figure Figure . Each Role corresponds to one Entity and can also have a Relationship. Similarly each RoleType corresponds to one EntityType and can also have a RelationshipType. Figure Archetype Role UML model. A Role is a function played by someone or something. This archetype is an excerpt from a metamodel but the notion of a role often arises for .

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