From 28d42eff87da99a81612b245cfafe527abb28bce Mon Sep 17 00:00:00 2001
From: Pekka Helenius <fincer89@hotmail.com>
Date: Sat, 3 Oct 2020 01:27:44 +0300
Subject: [PATCH] Extend BookRepository interface; implement updateWithoutPrice
 method

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>
---
 .../bookstore/model/book/BookRepository.java  |  4 +-
 .../model/book/BookRepositoryCustom.java      | 12 ++++
 .../model/book/BookRepositoryImpl.java        | 57 +++++++++++++++++++
 3 files changed, 71 insertions(+), 2 deletions(-)
 create mode 100644 bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java
 create mode 100644 bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java

diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepository.java b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepository.java
index aa3a0a2..b3a6123 100644
--- a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepository.java
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepository.java
@@ -24,7 +24,7 @@ import org.springframework.data.rest.core.annotation.RestResource;
 		itemResourceRel = "booklist",
 		exported        = true
 		)
-public interface BookRepository extends CrudRepository<Book, Long> {
+public interface BookRepository extends CrudRepository<Book, Long>, BookRepositoryCustom {
 
 	@Override
 	//@RestResource(exported = false)
@@ -50,7 +50,7 @@ public interface BookRepository extends CrudRepository<Book, Long> {
 
 	/*
 	 * We need to override native delete method due to book hash id usage.
-	 * This is a native query, do not unnecessarily validate it.
+	 * This is a native HQL query, do not unnecessarily validate it.
 	 */
 	@Override
 	@Modifying
diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java
new file mode 100644
index 0000000..c93e555
--- /dev/null
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java
@@ -0,0 +1,12 @@
+package com.fjordtek.bookstore.model.book;
+
+/**
+*
+* @author Pekka Helenius
+*/
+
+public interface BookRepositoryCustom {
+
+	void updateWithoutPrice(Book book);
+
+}
\ No newline at end of file
diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java
new file mode 100644
index 0000000..5f5d778
--- /dev/null
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java
@@ -0,0 +1,57 @@
+package com.fjordtek.bookstore.model.book;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
+
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ *
+ * @author Pekka Helenius
+ */
+
+@Transactional
+public class BookRepositoryImpl implements BookRepositoryCustom {
+
+	@PersistenceContext
+	EntityManager entityManager;
+
+	/*
+	 * Selective update
+	 * Hibernate takes care of entityManager transactions (begin, commit, rollback, close, etc.)
+	 */
+	@Override
+	public void updateWithoutPrice(Book book) {
+		try {
+
+
+			/*
+			 * Book: refers to entity class, not table name!
+			 */
+			Query query = entityManager.createQuery(
+					"UPDATE Book SET"
+							+ " author_id   = :author,"
+							+ " category_id = :category,"
+							+ " isbn        = :isbn,"
+							+ " title       = :title,"
+							+ " year        = :year"
+							+ " WHERE id    = :id"
+					);
+
+			query.setParameter("author",   book.getAuthor().getId());
+			query.setParameter("category", book.getCategory().getId());
+			query.setParameter("isbn",     book.getIsbn());
+			query.setParameter("title",    book.getTitle());
+			query.setParameter("year",     book.getYear());
+			query.setParameter("id",       book.getId());
+
+			query.executeUpdate();
+
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+
+	}
+
+}
\ No newline at end of file