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084f2db8c6 EmployeeTask. EmployeePOID. message . Whenever an object changes its role, perhaps you hire one of your customers, you need to copy the data into the appropriate table and assign it a new POID value (or perhaps you could reuse the existing POID value). division. An employee holds one and only one position and a position may be held by one employee (some positions go unfilled). Database performance tuning. Position.SocialSecurityNumber. DateOrdered.
In Figure 9 you see a data schema for storing the value of attributes and for traversing inheritance structures.The schema isnt complete, it could be extended to map associations for example, but its sufficient for our purposes.The value of a single attribute is stored in the Value table, therefore to store an object with ten business attributes there would be ten records, one for each attribute.The Value.ObjectPOID column stores the unique identifier for the specific object (this approach assumes a common key strategy across all objects, when this isnt the case youll need to extend this table appropriately). TaskPOID. employees. getTotalTax(). Lazy Read Read an object into memory only when you require it. 3.4.3 Many-To-Many Mappings. Figure 17.
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