Added Book entity with associated repository and service layers.

pom.xml

@@ -25,7 +25,11 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter</artifactId>
         </dependency>
-
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-core</artifactId>
+            <version>6.2.7.Final</version>
+        </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
@@ -36,6 +40,30 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.3.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.hsqldb</groupId>
+            <artifactId>hsqldb</artifactId>
+            <version>2.7.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
     </dependencies>
 
     <build>
@@ -71,8 +99,14 @@
                     <linkXRef>false</linkXRef>
                 </configuration>
             </plugin>
-
         </plugins>
     </build>
+    <repositories>
+        <repository>
+            <id>maven_central</id>
+            <name>Maven Central</name>
+            <url>https://repo.maven.apache.org/maven2/</url>
+        </repository>
+    </repositories>
 
 </project>

src/main/java/mate/academy/bookstore/BookStoreApplication.java

@@ -1,13 +1,35 @@
 package mate.academy.bookstore;
 
+import java.math.BigDecimal;
+import mate.academy.bookstore.model.Book;
+import mate.academy.bookstore.service.BookService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
 
 @SpringBootApplication
 public class BookStoreApplication {
+    @Autowired
+    private BookService bookService;
 
     public static void main(String[] args) {
         SpringApplication.run(BookStoreApplication.class, args);
     }
 
+    @Bean
+    public CommandLineRunner commandLineRunner() {
+        return args -> {
+            Book book = new Book();
+            book.setTitle("Kobzar");
+            book.setAuthor("Taras Shevchenko");
+            book.setDescription("Description");
+            book.setIsbn("ISBN 123456");
+            book.setPrice(BigDecimal.TEN);
+
+            bookService.save(book);
+            bookService.findAll().forEach(System.out::println);
+        };
+    }
 }

src/main/java/mate/academy/bookstore/exception/DataProcessingException.java

@@ -0,0 +1,7 @@
+package mate.academy.bookstore.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/mate/academy/bookstore/model/Book.java

@@ -0,0 +1,29 @@
+package mate.academy.bookstore.model;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import java.math.BigDecimal;
+import lombok.Data;
+
+@Entity
+@Data
+@Table(name = "books")
+public class Book {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    @Column(nullable = false)
+    private String title;
+    @Column(nullable = false)
+    private String author;
+    @Column(nullable = false, unique = true)
+    private String isbn;
+    @Column(nullable = false)
+    private BigDecimal price;
+    private String description;
+    private String coverImage;
+}

src/main/java/mate/academy/bookstore/repository/BookRepository.java

@@ -0,0 +1,10 @@
+package mate.academy.bookstore.repository;
+
+import java.util.List;
+import mate.academy.bookstore.model.Book;
+
+public interface BookRepository {
+    Book save(Book book);
+
+    List<Book> findAll();
+}

src/main/java/mate/academy/bookstore/repository/impl/BookRepositoryImpl.java

@@ -0,0 +1,56 @@
+package mate.academy.bookstore.repository.impl;
+
+import jakarta.persistence.criteria.CriteriaQuery;
+import java.util.List;
+import mate.academy.bookstore.exception.DataProcessingException;
+import mate.academy.bookstore.model.Book;
+import mate.academy.bookstore.repository.BookRepository;
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class BookRepositoryImpl implements BookRepository {
+    private final SessionFactory sessionFactory;
+
+    @Autowired
+    public BookRepositoryImpl(SessionFactory sessionFactory) {
+        this.sessionFactory = sessionFactory;
+    }
+
+    @Override
+    public Book save(Book book) {
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = sessionFactory.openSession();
+            transaction = session.beginTransaction();
+            session.persist(book);
+            transaction.commit();
+            return book;
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new DataProcessingException("Can't save book into DB: " + book, e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        try (Session session = sessionFactory.openSession()) {
+            CriteriaQuery<Book> criteriaQuery = session
+                    .getCriteriaBuilder().createQuery(Book.class);
+            criteriaQuery.from(Book.class);
+            return session.createQuery(criteriaQuery).getResultList();
+        } catch (Exception e) {
+            throw new DataProcessingException("Can't find all books", e);
+        }
+    }
+}

src/main/java/mate/academy/bookstore/service/BookService.java

@@ -0,0 +1,10 @@
+package mate.academy.bookstore.service;
+
+import java.util.List;
+import mate.academy.bookstore.model.Book;
+
+public interface BookService {
+    Book save(Book book);
+
+    List<Book> findAll();
+}

src/main/java/mate/academy/bookstore/service/impl/BookServiceImpl.java

@@ -0,0 +1,28 @@
+package mate.academy.bookstore.service.impl;
+
+import java.util.List;
+import mate.academy.bookstore.model.Book;
+import mate.academy.bookstore.repository.BookRepository;
+import mate.academy.bookstore.service.BookService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class BookServiceImpl implements BookService {
+    private final BookRepository bookRepository;
+
+    @Autowired
+    public BookServiceImpl(BookRepository bookRepository) {
+        this.bookRepository = bookRepository;
+    }
+
+    @Override
+    public Book save(Book book) {
+        return bookRepository.save(book);
+    }
+
+    @Override
+    public List<Book> findAll() {
+        return bookRepository.findAll();
+    }
+}

src/main/resources/application.properties

@@ -1 +1,9 @@
 spring.application.name=book-store
+spring.datasource.url=jdbc:mysql://localhost:3306/bookstore?serverTimezone=UTC
+spring.datasource.username=root
+spring.datasource.password=password
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+
+spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect
+spring.jpa.hibernate.ddl-auto=create-drop
+spring.jpa.show-sql=true

src/test/resources/application.properties

@@ -0,0 +1,5 @@
+spring.datasource.url=jdbc:h2:mem:testdb
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=password
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect