DTO via a custom ResultTransformer

Author: AnghelLeonard

HibernateSpringBootDtoCustomResultTransformer/src/main/java/com/bookstore/dao/AuthorDao.java

@@ -0,0 +1,9 @@
+package com.bookstore.dao;
+
+import com.bookstore.dto.AuthorDto;
+import java.util.List;
+
+public interface AuthorDao {
+
+    public List<AuthorDto> fetchAuthorWithBook();
+}

HibernateSpringBootDtoCustomResultTransformer/src/main/java/com/bookstore/dao/Dao.java

@@ -10,11 +10,12 @@
 import org.springframework.transaction.annotation.Transactional;
 
 @Repository
-public class Dao {
+public class Dao implements AuthorDao {
 
     @PersistenceContext
     private EntityManager entityManager;
 
+    @Override
     @Transactional(readOnly = true)
     public List<AuthorDto> fetchAuthorWithBook() {
         Query query = entityManager