Getting Started with InfoSphere Data Architect

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56 Getting started with InfoSphere Data Architect 3.2.2.5 Designing the data diagram and logical data model An entity is a logical data model object that store information about significant areas of interest. Each entity contains attributes, which store details about the entities. For example, you can create a Sales entity, with ProductKey, Quantity, UnitPrice, and OrderKey attributes to describe the sales for various products. When the logical data model is transformed into a physical data model, the entities can become tables, and attributes become columns. When you create entities and attributes, be as specific as you can. Insert all attributes you need, all domain constraints, and all other aspects you consider in helping you obtaining a model closer to real world. Remember that the logical data model will be transformed into a physical data model. Let's use the data diagram to add a new entity to the logical data model: 1. In the Palette view, expand the Data section, then drag and drop an entity onto a blank space in the diagram editor. The new entity is created in the model and within the diagram, and you can immediately give the entity a new name. 2. Name the entity STUDENT. The entity is created in the diagram, and the corresponding data object is created in the logical data model. When you add or modify logical data model objects by using the palette or the diagram surface, the underlying logical data model is modified.
Chapter 3 – Logical Data Modeling 57 Figure 3.5 – Creating the STUDENT entity You can also add entities to the diagram via two other methods: Using the context menu: You can right-click in the diagram editor to add data objects to a diagram. To add a new entity, you can right-click an empty area of the editor, then select Add Data Object > Entity. You can also use this method to add other data objects to existing data objects; for example, you can add attributes to entities by using this method. Using the pop-up bar to create entities: You can use the white space on the diagram editor to add data objects to diagrams. When you hover over a data object or an empty area of the diagram, a pop-up bar appears, as shown in Figure 3.6: Figure 3.6 – Using the pop-up bar to create data objects in the diagram You can also use this method to add other data objects to existing data objects; for example, you can add primary keys to entities by using this method.
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G E T T I N G S T A R T E D W I T H
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Getting Started with InfoSphere Data Architect

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