bookDao methods implemented and tested

pom.xml

@@ -55,4 +55,11 @@
             </plugins>
         </pluginManagement>
     </build>
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.3.0</version>
+        </dependency>
+    </dependencies>
 </project>

src/main/java/mate/academy/lib/dao/BookDao.java

@@ -0,0 +1,17 @@
+package mate.academy.lib.dao;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.lib.model.Book;
+
+public interface BookDao {
+    Book create(Book book);
+
+    Optional<Book> findById(Long id);
+
+    List<Book> findAll();
+
+    Book update(Book book);
+
+    boolean deleteById(Long id);
+}

src/main/java/mate/academy/lib/dao/BookDaoImpl.java

@@ -0,0 +1,121 @@
+package mate.academy.lib.dao;
+
+import java.math.BigDecimal;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import mate.academy.lib.Dao;
+import mate.academy.lib.exception.DataProcessingException;
+import mate.academy.lib.model.Book;
+import mate.academy.lib.service.util.ConnectionUtil;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    private static final String ID = "id";
+    private static final String TITLE = "title";
+    private static final String PRICE = "price";
+
+    @Override
+    public Book create(Book book) {
+        String sql = "INSERT INTO books (title, price) VALUES (?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql,
+                        Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new DataProcessingException("Expected to insert at least 1 row,"
+                        + " inserted 0 rows");
+            }
+
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to add new book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                long bookId = resultSet.getObject(ID, Long.class);
+                String title = resultSet.getString(TITLE);
+                BigDecimal price = resultSet.getBigDecimal(PRICE);
+                Book book = new Book(bookId, title, price);
+                return Optional.of(book);
+            } else {
+                return Optional.empty();
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to find a book with id: " + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sql = "SELECT * FROM books";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            ResultSet resultSet = statement.executeQuery();
+
+            while (resultSet.next()) {
+                long id = resultSet.getLong(ID);
+                String title = resultSet.getString(TITLE);
+                BigDecimal price = resultSet.getBigDecimal(PRICE);
+                Book book = new Book(id, title, price);
+                books.add(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to retrieve books from the database", e);
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sql = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new DataProcessingException("Expected to insert at least 1 row,"
+                        + " inserted 0 rows");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to update a new book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            return statement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to delete a book with id: " + id, e);
+        }
+    }
+}

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

@@ -0,0 +1,11 @@
+package mate.academy.lib.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable ex) {
+        super(message, ex);
+    }
+
+    public DataProcessingException(String message) {
+        super(message);
+    }
+}

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

@@ -0,0 +1,56 @@
+package mate.academy.lib.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book() {
+    }
+
+    public Book(String title, BigDecimal price) {
+        this.title = title;
+        this.price = price;
+    }
+
+    public Book(Long id, String title, BigDecimal price) {
+        this.id = id;
+        this.title = title;
+        this.price = price;
+    }
+
+    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 BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price=" + price
+                + '}';
+    }
+}

src/main/java/mate/academy/lib/service/Main.java

@@ -0,0 +1,27 @@
+package mate.academy.lib.service;
+
+import java.math.BigDecimal;
+import mate.academy.lib.Injector;
+import mate.academy.lib.dao.BookDao;
+import mate.academy.lib.model.Book;
+
+public class Main {
+    private static final Injector injector = Injector.getInstance("mate.academy.lib");
+
+    public static void main(String[] args) {
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+
+        Book airport = new Book("Airport", BigDecimal.valueOf(29.00));
+        bookDao.create(airport);
+        System.out.println(airport);
+
+        System.out.println(bookDao.findById(2L));
+
+        airport.setTitle("Waterport");
+        System.out.println(bookDao.update(airport));
+
+        bookDao.deleteById(1L);
+
+        System.out.println(bookDao.findAll());
+    }
+}

src/main/java/mate/academy/lib/service/util/ConnectionUtil.java

@@ -0,0 +1,30 @@
+package mate.academy.lib.service.util;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtil {
+    private static final String DB_URL = "jdbc:mysql://localhost:3306/mate";
+    private static final String DB_DRIVER = "com.mysql.cj.jdbc.Driver";
+    private static final String DB_USERNAME = "root";
+    private static final String DB_PASSWORD = "MySQL1914#";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", DB_USERNAME);
+        DB_PROPERTIES.put("password", DB_PASSWORD);
+
+        try {
+            Class.forName(DB_DRIVER);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load JDBC driver : " + DB_DRIVER, e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,5 @@
+CREATE TABLE `books` (
+    `id` BIGINT AUTO_INCREMENT PRIMARY KEY,
+    `title` VARCHAR(255) NOT NULL,
+    `price` DECIMAL(10, 2) NOT NULL
+);