UML UML to Relations.

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Presentation transcript:

UML UML to Relations

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

UML Modeling Unified Modeling Language (UML) 5 concepts 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 Modeling UML to Relations: Classes Every class becomes a relation; pk  primary key

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

UML Modeling UML to Relations: Associations Relation with key from each side

UML Modeling Keys for Association Relations Depends on multiplicity

UML Modeling Association Relation Always Needed? Depends on multiplicity

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

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

UML Modeling Self-Associations

UML Modeling Self-Associations

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

UML Modeling Subclasses 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 Modeling Subclasses – Example

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

UML Modeling Composition & Aggregation

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