BAEL-1176 SPring Could Heroku (#3212)

* BAEL-1176 setting up base application with in memory database

* BAEL-1176 adding postgres stuff

* BAEL-1176 swapping product entity for book entity to make this in line with other spring boot apps.

* BAEL-1176 change products endpoint to books

spring-cloud/spring-cloud-connectors-heroku/src/main/java/com/baeldung/spring/cloud/connectors/heroku/book/Book.java

@@ -0,0 +1,39 @@
+package com.baeldung.spring.cloud.connectors.heroku.book;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Book {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String title;
+    private String author;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+}

spring-cloud/spring-cloud-connectors-heroku/src/main/java/com/baeldung/spring/cloud/connectors/heroku/book/BookController.java

@@ -0,0 +1,26 @@
+package com.baeldung.spring.cloud.connectors.heroku.book;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/books")
+public class BookController {
+
+    private final BookService bookService;
+
+    @Autowired
+    public BookController(BookService bookService) {
+        this.bookService = bookService;
+    }
+
+    @GetMapping("/{bookId}")
+    public Book findBook(@PathVariable Long bookId) {
+        return bookService.findBookById(bookId);
+    }
+
+    @PostMapping
+    public Book createBook(@RequestBody Book book) {
+        return bookService.createBook(book);
+    }
+}

spring-cloud/spring-cloud-connectors-heroku/src/main/java/com/baeldung/spring/cloud/connectors/heroku/book/BookRepository.java

@@ -0,0 +1,6 @@
+package com.baeldung.spring.cloud.connectors.heroku.book;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface BookRepository extends JpaRepository<Book, Long>{
+}

spring-cloud/spring-cloud-connectors-heroku/src/main/java/com/baeldung/spring/cloud/connectors/heroku/book/BookService.java

@@ -0,0 +1,29 @@
+package com.baeldung.spring.cloud.connectors.heroku.book;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional(readOnly = true)
+public class BookService {
+    private final BookRepository bookRepository;
+
+    @Autowired
+    public BookService(BookRepository bookRepository) {
+        this.bookRepository = bookRepository;
+    }
+
+    public Book findBookById(Long bookId) {
+        return bookRepository.findOne(bookId);
+    }
+
+    @Transactional(propagation = Propagation.REQUIRED)
+    public Book createBook(Book book) {
+        Book newBook = new Book();
+        newBook.setTitle(book.getTitle());
+        newBook.setAuthor(book.getAuthor());
+        return bookRepository.save(newBook);
+    }
+}