Item 81: Why and How to Count and Assert SQL Statements
Assuming that you have the Author entity mapped to the table, as shown in Figure 9-1, the goal is to atomically perform the following simple scenario:
Load an Author from the database
Update the genre of this Author
Figure 9-1
The Author entity table
A simple service-method can implement this scenario, as follows:
@Service
public class BookstoreService {
private final AuthorRepository authorRepository;
...
public void updateAuthor() ...
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