Avoid unidirectional @onetomany

Author: AnghelLeonard

HibernateSpringBootOneToManyUnidirectinal/src/main/java/com/bookstore/MainApplication.java

@@ -22,13 +22,13 @@ public static void main(String[] args) {
     @Bean
     public ApplicationRunner init() {
         return args -> {
-            System.out.println("\nAdd one author with three books  ...");
-            bookstoreService.addAuthorWithBooks();
+            System.out.println("\nInsert one author with three books  ...");
+            bookstoreService.insertAuthorWithBooks();
 
             System.out.println("\n---------------------------------------------");
 
-            System.out.println("\nAdd new book to an author  ...");
-            bookstoreService.addNewBook();
+            System.out.println("\nInsert new book to an author  ...");
+            bookstoreService.insertNewBook();
 
             System.out.println("\n---------------------------------------------");
 

HibernateSpringBootOneToManyUnidirectinal/src/main/java/com/bookstore/repository/AuthorRepository.java

@@ -2,12 +2,14 @@
 
 import com.bookstore.entity.Author;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
 
 @Repository
+@Transactional(readOnly = true)
 public interface AuthorRepository extends JpaRepository<Author, Long> {
-
-    @Transactional(readOnly = true)
-    Author findByName(String name);
+    
+    @Query("SELECT a FROM Author a JOIN FETCH a.books WHERE a.name = ?1")
+    Author fetchByName(String name);
 }

HibernateSpringBootOneToManyUnidirectinal/src/main/java/com/bookstore/service/BookstoreService.java

@@ -18,7 +18,7 @@ public BookstoreService(AuthorRepository authorRepository) {
     }
 
     @Transactional
-    public void addAuthorWithBooks() {
+    public void insertAuthorWithBooks() {
 
         Author jn = new Author();
         jn.setName("Joana Nimar");
@@ -45,9 +45,9 @@ public void addAuthorWithBooks() {
     }
 
     @Transactional
-    public void addNewBook() {
+    public void insertNewBook() {
 
-        Author author = authorRepository.findByName("Joana Nimar");
+        Author author = authorRepository.fetchByName("Joana Nimar");
 
         Book book = new Book();
         book.setIsbn("004-JN");
@@ -61,7 +61,7 @@ public void addNewBook() {
     @Transactional
     public void deleteLastBook() {
 
-        Author author = authorRepository.findByName("Joana Nimar");
+        Author author = authorRepository.fetchByName("Joana Nimar");
         List<Book> books = author.getBooks();
 
         author.removeBook(books.get(books.size() - 1));
@@ -70,7 +70,7 @@ public void deleteLastBook() {
     @Transactional
     public void deleteFirstBook() {
 
-        Author author = authorRepository.findByName("Joana Nimar");
+        Author author = authorRepository.fetchByName("Joana Nimar");
         List<Book> books = author.getBooks();
 
         author.removeBook(books.get(0));