Implemented BookDao

pom.xml

@@ -18,6 +18,14 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -1,7 +1,27 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
 public class Main {
+    private static final Injector injector = Injector.getInstance("mate.academy");
+
     public static void main(String[] args) {
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+
+        Book zapovit = new Book("zapovit", BigDecimal.valueOf(100));
+        Book newZapiovit = bookDao.create(zapovit);
+
+        Optional<Book> bookById2 = bookDao.findById(2L);
+
+        List<Book> allBooks = bookDao.findAll();
+
+        Book updateZapovit = bookDao.update(zapovit);
 
+        boolean isDeleted = bookDao.deleteById(3L);
     }
 }

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

@@ -0,0 +1,17 @@
+package mate.academy.dao;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.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/dao/BookDaoImpl.java

@@ -0,0 +1,121 @@
+package mate.academy.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.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+import mate.academy.util.ConnectionUtil;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    @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());
+            validateStatementExecution(statement);
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not add a 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()) {
+                Book book = mapToBook(resultSet);
+                return Optional.of(book);
+            } else {
+                throw new RuntimeException("Can not find book in database by id = " + id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not create a connection to the database", e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        String sql = "SELECT * FROM books;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                Book book = mapToBook(resultSet);
+                books.add(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not create a connection to 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());
+            validateStatementExecution(statement);
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not create a connection to the database", e);
+        }
+    }
+
+    @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);
+            int affectedRows = statement.executeUpdate();
+            return affectedRows >= 1;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not create a connection to the database", e);
+        }
+    }
+
+    private Book mapToBook(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getObject("id", Long.class);
+        String title = resultSet.getString("title");
+        BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+        Book book = new Book();
+        book.setId(id);
+        book.setTitle(title);
+        book.setPrice(price);
+        return book;
+    }
+
+    private void validateStatementExecution(PreparedStatement statement)
+            throws SQLException {
+        int affectedRows = statement.executeUpdate();
+        if (affectedRows < 1) {
+            throw new DataProcessingException(
+                    "Expected to modify at least one row, but modified 0 rows.");
+        }
+    }
+}

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

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

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

@@ -0,0 +1,41 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book(String title, BigDecimal price) {
+        this.title = title;
+        this.price = price;
+    }
+
+    public Book() {
+    }
+
+    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;
+    }
+}

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

@@ -0,0 +1,34 @@
+package mate.academy.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtil {
+    private static final Properties DB_PROPERTIES = new Properties();
+    private static final String CONFIG_FILE = "config.properties";
+
+    static {
+        try (InputStream input = ConnectionUtil.class.getClassLoader()
+                .getResourceAsStream(CONFIG_FILE)) {
+            if (input == null) {
+                throw new RuntimeException(
+                        "Configuration file '" + CONFIG_FILE + "' not found in classpath");
+            }
+            DB_PROPERTIES.load(input);
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (IOException | ClassNotFoundException e) {
+            throw new RuntimeException("Cannot load configuration or JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        String url = DB_PROPERTIES.getProperty("db.url");
+        String user = DB_PROPERTIES.getProperty("db.user");
+        String password = DB_PROPERTIES.getProperty("db.password");
+        return DriverManager.getConnection(url, user, password);
+    }
+}

src/main/resources/config.properties

@@ -0,0 +1,3 @@
+db.url=jdbc:mysql://localhost:3306/intro
+db.user=root
+db.password=091088a+

src/main/resources/init_db.sql

@@ -0,0 +1,17 @@
+CREATE DATABASE IF NOT EXISTS `intro`;
+
+USE `intro`;
+
+CREATE TABLE `books` (
+    `id` BIGINT AUTO_INCREMENT,
+    `title` VARCHAR(255),
+    `price` DECIMAL,
+    PRIMARY KEY (`id`)
+);
+
+INSERT INTO `books` (`title`, `price`) VALUES
+('The Catcher in the Rye', 120),
+('To Kill a Mockingbird', 150),
+('1984', 200),
+('The Great Gatsby', 180),
+('Moby Dick', 220);