added BookDao and connected project to db

pom.xml

@@ -14,4 +14,12 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+    </dependencies>
+
 </project>

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

@@ -1,7 +1,39 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import mate.academy.dao.BookDao;
+import mate.academy.dao.BookDaoImpl;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
 public class Main {
     public static void main(String[] args) {
+        Injector injector = Injector.getInstance("mate.academy");
+        BookDao bookDao = (BookDaoImpl) injector.getInstance(BookDao.class);
+
+        Book cleanCodeBook = new Book();
+        cleanCodeBook.setTitle("Clean Code");
+        cleanCodeBook.setPrice(BigDecimal.valueOf(29.99));
+        bookDao.create(cleanCodeBook);
+
+        Book colorOfMagicBook = new Book();
+        colorOfMagicBook.setTitle("The color of magic");
+        colorOfMagicBook.setPrice(BigDecimal.valueOf(69.99));
+        bookDao.create(colorOfMagicBook);
+
+        System.out.println(bookDao.findById(1L));
+
+        colorOfMagicBook.setPrice(BigDecimal.valueOf(6.99));
+        bookDao.update(colorOfMagicBook);
+
+        System.out.println(bookDao.findAll());
+
+        bookDao.deleteById(colorOfMagicBook.getId());
 
+        bookDao.findAll().stream()
+                .peek(b -> {
+                    b.setPrice(b.getPrice().multiply(BigDecimal.valueOf(0.9)));
+                    bookDao.update(b);
+                }).forEach(System.out::println);
     }
 }

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 +1,129 @@
+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 {
+    private static final int ZERO_UPDATES = 0;
+    private static final int ID_INDEX = 1;
+    private static final int TITLE_INDEX = 2;
+    private static final int PRICE_INDEX = 3;
+    private static final int TITLE_INDEX_FOR_UPDATE_OPERATION = 1;
+    private static final int PRICE_INDEX_FOR_UPDATE_OPERATION = 2;
+    private static final int ID_INDEX_FOR_UPDATE_OPERATION = 3;
+    private static final String ID_COLUMN = "books.id";
+    private static final String TITLE_COLUMN = "books.title";
+    private static final String PRICE_COLUMN = "books.price";
+    private static final String NO_UPDATES_EXCEPTION_TEXT = "Expected to update at least 1 value, but updated 0 values.";
+    private static final String CREATING_BOOK_EXCEPTION_TEXT = "Can't save a book ";
+    private static final String FINDING_BOOK_BY_ID_EXCEPTION_TEXT = "Can't get a book by id = ";
+    private static final String GETTING_LIST_OF_ALL_BOOKS_EXCEPTION_TEXT = "Can't get a book list from db";
+    private static final String UPDATING_BOOK_EXCEPTION_TEXT = "Can't update book ";
+    private static final String DELETING_BOOK_BY_ID_EXCEPTION_TEXT = "Can't delete a book by id = ";
+
+    @Override
+    public Book create(Book book) {
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement("INSERT INTO books (id, title, price) VALUES (?, ?, ?)", Statement.RETURN_GENERATED_KEYS)) {
+
+            statement.setLong(ID_INDEX, book.getId());
+            statement.setString(TITLE_INDEX, book.getTitle());
+            statement.setBigDecimal(PRICE_INDEX, book.getPrice());
+
+            if (statement.executeUpdate() == ZERO_UPDATES) {
+                throw new RuntimeException(NO_UPDATES_EXCEPTION_TEXT);
+            }
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Integer id = generatedKeys.getObject(ID_INDEX, Integer.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(CREATING_BOOK_EXCEPTION_TEXT + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement("SELECT * FROM books WHERE id = ?")) {
+
+            statement.setLong(ID_INDEX, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(parseBookFromQuery(resultSet));
+            }
+            return Optional.empty();
+        } catch (SQLException e) {
+            throw new DataProcessingException(FINDING_BOOK_BY_ID_EXCEPTION_TEXT + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement("SELECT * FROM books")) {
+
+             ResultSet resultSet = statement.executeQuery();
+            List<Book> books = new ArrayList<>();
+            while (resultSet.next()) {
+                books.add(parseBookFromQuery(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException(GETTING_LIST_OF_ALL_BOOKS_EXCEPTION_TEXT, e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement("UPDATE books SET title = ?, price = ? WHERE id = ?")) {
+
+            statement.setString(TITLE_INDEX_FOR_UPDATE_OPERATION, book.getTitle());
+            statement.setBigDecimal(PRICE_INDEX_FOR_UPDATE_OPERATION, book.getPrice());
+            statement.setLong(ID_INDEX_FOR_UPDATE_OPERATION, book.getId());
+
+            if (statement.executeUpdate() == ZERO_UPDATES) {
+                throw new RuntimeException(NO_UPDATES_EXCEPTION_TEXT);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(UPDATING_BOOK_EXCEPTION_TEXT + book, e);
+        }
+        return null;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement("DELETE FROM books WHERE id = ?")) {
+
+            statement.setLong(ID_INDEX, id);
+
+            return statement.executeUpdate() > ZERO_UPDATES;
+        } catch (SQLException e) {
+            throw new DataProcessingException(DELETING_BOOK_BY_ID_EXCEPTION_TEXT + id, e);
+        }
+    }
+
+    private Book parseBookFromQuery(ResultSet resultSet) throws SQLException{
+        Book book = new Book();
+        book.setId(resultSet.getObject(ID_COLUMN, Long.class));
+        book.setTitle(resultSet.getObject(TITLE_COLUMN, String.class));
+        book.setPrice(resultSet.getObject(PRICE_COLUMN, BigDecimal.class));
+        return book;
+    }
+}

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

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

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

@@ -0,0 +1,42 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private long id;
+    private String title;
+    private BigDecimal 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/util/ConnectionUtil.java

@@ -0,0 +1,26 @@
+package mate.academy.util;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtil {
+    public static final String DB_URL = "jdbc:mysql://localhost:3306/book_schema";
+    public static final Properties DB_PROPERTIES;
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "qwerty123");
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Failed to load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,7 @@
+CREATE DATABASE book_schema;
+USE book_schema;
+CREATE TABLE books (
+    `id` BIGINT NOT NULL AUTO_INCREMENT,
+    `title` VARCHAR(255),
+    `price` DECIMAL,
+    PRIMARY KEY (`id`));