UML UML to Relations.

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Presentation transcript:

UML UML to Relations

High-Level Database Design Model UML to Relations High-Level Database Design Model User-friendly (graphical) specification language Translated into model of DBMS

Unified Modeling Language (UML) 5 concepts UML to Relations Unified Modeling Language (UML) Data modeling subset 5 concepts Classes Associations Association Classes Subclasses Composition & Aggregation Designs can be translated to relations automatically Provided every “regular” class has a key

UML to Relations: Classes Every class becomes a relation; pk  primary key

UML Data Modeling: 5 concepts Classes Associations Association Classes UML to Relations UML Data Modeling: 5 concepts Classes Associations Association Classes Subclasses Composition & Aggregation

UML to Relations: Associations Relation with key from each side

Keys for Association Relations Depends on multiplicity UML to Relations Keys for Association Relations Depends on multiplicity

Association Relation Always Needed? Depends on multiplicity UML to Relations Association Relation Always Needed? Depends on multiplicity

UML Data Modeling: 5 concepts Classes Associations Association Classes UML to Relations UML Data Modeling: 5 concepts Classes Associations Association Classes Subclasses Composition & Aggregation

UML to Relations: Association Classes Add attributes to relation for association

UML to Relations Self-Associations

UML to Relations Self-Associations

UML Data Modeling: 5 concepts Classes Associations Association Classes UML to Relations UML Data Modeling: 5 concepts Classes Associations Association Classes Subclasses Composition & Aggregation

Subclasses UML to Relations 1) Subclass relations contain superclass key + specialized attrs. 2) Subclass relations contain all attributes 3) One relation containing all superclass + subclass attrs. Best translation may depend on properties

UML to Relations Subclasses – Example

UML Data Modeling: 5 concepts Classes Associations Association Classes UML to Relations UML Data Modeling: 5 concepts Classes Associations Association Classes Subclasses Composition & Aggregation

Composition & Aggregation UML to Relations Composition & Aggregation

UML: High-Level Database Design Model UML to Relations UML: High-Level Database Design Model User-friendly graphical specification language Designs translated to relations automatically