Class diagram

In the design of a system, a number of classes are identified and grouped together in a class diagram that helps to determine the static relations between them. With detailed modelling, the classes of the conceptual design are often split into a number of subclasses.

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Design patterns are solutions to software design problems you find again and again in real-world application development. Patterns are about reusable designs and interactions of objects. Patterns are about reusable designs and interactions of objects.

Thus, you can create different diagrams to visualize different portions of the database, or to accentuate different aspects of the design. For example, you can create a large diagram showing all tables and columns, and you can create a smaller diagram showing all tables without showing the columns. Within a database diagram, each table can appear with three distinct features: Row Selector You can click the row selector to select a database column in the table. The row selector displays a key symbol if the column is in the table's primary key.

Property Columns The set of property columns is visible only in the certain views of your table. You can view a table in any of five different views to help you manage the size and layout of your diagram. Within a database diagram, each relationship can appear with three distinct features: The UML representation of an association is a line connecting the two associated classes. At each end of the line there is optional notation.

For example, we can indicate, using an arrowhead that the pointy end is visible from the arrow tail. We can indicate ownership by the placement of a ball, the role the elements of that end play by supplying a name for the role, and the multiplicity of instances of that entity the range of number of objects that participate in the association from the perspective of the other end. Entity classes model long-lived information handled by the system, and sometimes the behavior associated with the information.

They should not be identified as database tables or other data-stores. They are drawn as circles with a short line attached to the bottom of the circle.

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This page was last edited on 28 December , at By using this site, you agree to the Terms of Use and Privacy Policy. Class diagram Component diagram Composite structure diagram Deployment diagram Object diagram Package diagram Profile diagram. Activity diagram Communication diagram Interaction overview diagram Sequence diagram State diagram Timing diagram Use case diagram.

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