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Item 77: How to Map Calculated Non-Persistent Properties
This item is about mapping calculated non-persistent properties of an entity based on the persistent entity attributes. It uses the Book entity mapping shown in Figure 8-1.
Figure 8-1
Book class diagram
Each book has a price mapped via the persistent field, called price. And, based on the price, the developer must calculate the value of the non-persistent field, discounted. This is the price with a discount applied. Let’s ...
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