Entity Relationship Modeling with UML（实体关系建模与UML）.pdfVIP

A technical discussion on modeling with UML 06/11/03 Entity Relationship Modeling with UML Davor Gornik Improving software development capability 2 Table of Contents Entity Relationship Modeling 1 Core Elements of ER Modeling 1 Entity Types 1 Attributes 2 Relationship Types 2 Attributes of Relationship Types 3 Simple Constraints in ER Modeling 4 Cardinality 4 Dependency 6 Specialization and Generalization7 Specialization and Generalization7 Categorization 8 Notations for the ER Methodology 9 Entity Types in UML 9 Attributes in UML 10 Relationship Types in UML 10 Attributes of Relationship Types in UML 11 Simple Constraints in UML11 Cardinality 11 Dependency 12 Specialization and Generalization12 Categorization 13 Summary 14 Entity Relationship Modeling One of the most misinterpreted terms in the software industry is actually one we know very well: entity relationship (ER). That’s because we often lack a common definition that is understood by all members of the development team. We assume that everyone on the team shares the same clear understanding of the methodology, syntax, and mechanics associated with ER and ER modeling. ER modeling itself defines the methodology used in the analysis and design of information-based systems. Database designers often use this methodology to gather requirements and define the architecture of the database systems. The output of this methodology is a list of entity types, relationship types, and constraints. Unfortunately, ER modeling does not define the graphic syntax for the representation of ER diagrams. Many times notations are used solely by the database team and limit the ER modeling to relational database design. We need a notati