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 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
