By Toby J Teorey; Sam Lightstone; Tom Nadeau
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All incoming threads must complete before control continues along the outgoing arrow. 12, the Customer pays, the Manufacturer records the payment (Record payment), and then a final state is reached. Notice that an activity diagram may have multiple final states. However, there can only be one initial state. There are at least two uses for activity diagrams in the context of database design. Activity diagrams can specify the interactions of classes in a database schema. Class diagrams capture structure, activity diagrams capture behavior.
Notice the four relationships share a common arrowhead. Semantically, these are still four separate relationships. The sharing of the arrowhead is permissible in UML, to improve the clarity of the diagrams. 1 Class Diagrams ship. The class named Individual is a generalization of the Employee and Customer classes. The Employee and Customer classes are in turn superclasses of the EmpCust class. A class can be a subclass in more than one generalization relationship. The meaning in the example is that an EmpCust object is both an Employee and a Customer.
The syntax and the semantics of the UML constructs are the same, regardless of the process described. Our examples draw from workflows that are followed by people and organizations, since these are more useful for the logical design of databases. 1 Activity Diagram Notation Description Activity diagrams include notation for nodes, control flow, and organization. 11. 2. The nodes include initial node, final node, and activity node. Any process begins with control residing in the initial node, represented as a solid black circle.
Database modeling & design : logical design by Toby J Teorey; Sam Lightstone; Tom Nadeau