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UML

UML. UML Data Modeling. UML Modeling. Data Modeling How to represent data for application Relational model  with design principles XML Database design model Not implemented by system Translated into model of DBMS. UML Modeling. Higher-Level Database Design Models

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UML

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  1. UML UML Data Modeling

  2. UML Modeling Data Modeling How to represent data for application • Relational model  with design principles • XML • Database design model • Not implemented by system • Translated into model of DBMS

  3. UML Modeling Higher-Level Database Design Models • Entity-Relationship Model (E/R) • Unified Modeling Language (UML) Data modeling subset • Both are graphical • Both can be translated to relations automatically Or semi-automatically

  4. UML Modeling UML Data Modeling: 5 concepts • Classes • Associations • Association Classes • Subclasses • Composition & Aggregation

  5. UML Modeling UML Data Modeling: Classes Name, attributes, methods For data modeling: add “pk”, drop methods

  6. UML Modeling UML Data Modeling: 5 concepts • Classes • Associations • Association Classes • Subclasses • Composition & Aggregation

  7. UML Modeling UML Data Modeling: Associations Relationships between objects of two classes

  8. UML Modeling Multiplicity of Associations Relationships between objects of two classes Each object of class C1 is related to at least m and at most n objects of class C2

  9. UML Modeling Multiplicity of Associations: Example Students must apply somewhere and may not apply to more than 5 colleges. No college takes more than 20,000 applications.

  10. UML Modeling Multiplicity of Associations: Types of Relationships • One-to-One • Many-to-One • Many-to-Many • Complete

  11. UML Modeling UML Data Modeling: 5 concepts • Classes • Associations • Association Classes • Subclasses • Composition & Aggregation

  12. UML Modeling UML Data Modeling: Association Classes Relationships between objects of two classes, with attributes on relationships

  13. UML Modeling Eliminating Association Classes Unnecessary if 0..1 or 1..1 multiplicity

  14. UML Modeling Self-Associations Associations between a class and itself

  15. UML Modeling Self-Associations Associations between a class and itself

  16. UML Modeling UML Data Modeling: 5 concepts • Classes • Associations • Association Classes • Subclasses • Composition & Aggregation

  17. UML Modeling UML Data Modeling: Subclasses

  18. UML Modeling Subclass Terminology & Properties • Superclass= Generalization • Subclass = Specialization • Incomplete (Partial) vs. Complete • Disjoint (Exclusive) vs. Overlapping

  19. UML Modeling UML Data Modeling: 5 concepts • Classes • Associations • Association Classes • Subclasses • Composition & Aggregation

  20. UML Modeling UML Data Modeling: Composition & Aggregation Objects of one class belong to objects of another class

  21. UML Modeling Higher-Level Database Design • Unified Modeling Language (UML) Data modeling subset • Graphical • 5 concepts • Classes • Associations • Association Classes • Subclasses • Composition & Aggregation • Can be translated to relations automatically

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