added necessary methods

pom.xml

@@ -17,6 +17,13 @@
             https://raw.githubusercontent.com/mate-academy/style-guides/master/java/checkstyle.xml
         </maven.checkstyle.plugin.configLocation>
     </properties>
+    <dependencies>
+            <dependency>
+                <groupId>com.mysql</groupId>
+                <artifactId>mysql-connector-j</artifactId>
+                <version>8.3.0</version>
+            </dependency>
+    </dependencies>
 
     <build>
         <plugins>

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

@@ -0,0 +1,26 @@
+package mate.academy;
+
+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/test";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user","root");
+        DB_PROPERTIES.put("password","DimaSlava");
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can not load JDBC driver",e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL,DB_PROPERTIES);
+    }
+}

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

@@ -1,7 +1,34 @@
 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 bookJava = new Book();
+        bookJava.setTitle("Java");
+        bookJava.setPrice(BigDecimal.valueOf(350.00));
+        bookDao.create(bookJava);
+
+        Book bookHistory = new Book();
+        bookHistory.setTitle("History");
+        bookHistory.setPrice(BigDecimal.valueOf(350.00));
+        bookDao.create(bookHistory);
+
+        Optional<Book> optional = bookDao.findById(3L);
+        Book book = optional.get();
+        System.out.println(book);
 
+        List<Book> list = bookDao.findAll();
+        System.out.println(list);
+        bookDao.deleteById(1L);
     }
 }

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

@@ -0,0 +1,18 @@
+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 +1,123 @@
+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.ConnectionUtil;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    public static final int TITLE_INDEX = 1;
+    public static final int PRICE_INDEX = 2;
+    public static final int KEY_INDEX = 1;
+    public static final int KEY_POSITION_INDEX = 3;
+    public static final int MINIMUM_AFFECTED_ROWS = 1;
+    public static final int EXCEPTION_AFFECTED_ROWS = 0;
+    private static final String ID_COLUMN = "id";
+    private static final String TITLE_COLUMN = "title";
+    private static final String PRICE_COLUMN = "price";
+
+    @Override
+    public Book create(Book book) {
+        String createQuery = "INSERT INTO book(title,price) VALUE(?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection
+                        .prepareStatement(createQuery, Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(TITLE_INDEX, book.getTitle());
+            statement.setBigDecimal(PRICE_INDEX,book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < MINIMUM_AFFECTED_ROWS) {
+                throw new DataProcessingException("Expected to insert at least one row,"
+                        + " but inserted 0 rows",null);
+            }
+            ResultSet generateKeys = statement.getGeneratedKeys();
+            if (generateKeys.next()) {
+                long id = generateKeys.getObject(KEY_INDEX,long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not create new book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String findByIdQuery = "SELECT * FROM book WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(findByIdQuery)) {
+            statement.setLong(KEY_INDEX,id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(parseBookFromResultSet(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find all books", e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        String findAllQuery = "SELECT * FROM book";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(findAllQuery)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                books.add(parseBookFromResultSet(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to select all books form DB", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String updateQuery = "UPDATE book SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(updateQuery)) {
+            statement.setString(TITLE_INDEX, book.getTitle());
+            statement.setBigDecimal(PRICE_INDEX, book.getPrice());
+            statement.setLong(KEY_POSITION_INDEX, book.getId());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows == EXCEPTION_AFFECTED_ROWS) {
+                throw new RuntimeException("Updating book failed, no rows affected.");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Error updating book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String deleteQuery = "DELETE FROM book WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(deleteQuery)) {
+            statement.setLong(KEY_INDEX, id);
+            int updatedRows = statement.executeUpdate();
+            return updatedRows > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Error deleting book by id: " + id, e);
+        }
+    }
+
+    private Book parseBookFromResultSet(ResultSet resultSet) throws SQLException {
+        Book newBook = new Book();
+        newBook.setId(resultSet.getObject(ID_COLUMN, Long.class));
+        newBook.setTitle(resultSet.getObject(TITLE_COLUMN, String.class));
+        newBook.setPrice(resultSet.getObject(PRICE_COLUMN, BigDecimal.class));
+        return newBook;
+    }
+}

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 +1,45 @@
+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 String getTitle() {
+        return title;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price="
+                + price
+                +
+                '}';
+    }
+}
+

src/main/resources/init_db.sql

@@ -0,0 +1,6 @@
+CREATE TABLE `book`(
+`id` BIGINT NOT NULL AUTO_INCREMENT,
+`title` VARCHAR(255),
+`price` DECIMAL(10, 2),
+ PRIMARY KEY(`id`)
+);