Completed task

pom.xml

@@ -13,5 +13,12 @@
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.24</version>
+        </dependency>
+    </dependencies>
 
 </project>

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

@@ -1,7 +1,29 @@
 package mate.academy;
 
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
+import java.math.BigDecimal;
+
 public class Main {
+    private static Injector injector = Injector.getInstance("mate.academy");
     public static void main(String[] args) {
-
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+        Book firstBook = new Book();
+        firstBook.setTitle("Harry Potter");
+        firstBook.setPrice(BigDecimal.valueOf(100));
+        firstBook = bookDao.create(firstBook);
+        Book secondBook = new Book();
+        secondBook.setTitle("Witcher");
+        secondBook.setPrice(BigDecimal.valueOf(120));
+        secondBook = bookDao.create(secondBook);
+        System.out.println(bookDao.findById(firstBook.getId()));
+        System.out.println(bookDao.findById(secondBook.getId()));
+        System.out.println(bookDao.findAll());
+        System.out.println(bookDao.deleteById(firstBook.getId()));
+        secondBook.setPrice(BigDecimal.valueOf(140));
+        bookDao.update(secondBook);
+        System.out.println(bookDao.findAll());
     }
 }

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

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

@@ -0,0 +1,119 @@
+package mate.academy.dao.impl;
+
+import mate.academy.dao.BookDao;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+import mate.academy.util.ConnectionUtil;
+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;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    @Override
+    public Book create(Book book) {
+        String createBookQuery = "INSERT INTO books (title, price) VALUES (?, ?);";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement createBookStatement =
+                        connection.prepareStatement(createBookQuery,
+                                Statement.RETURN_GENERATED_KEYS)) {
+            createBookStatement.setString(1, book.getTitle());
+            createBookStatement.setBigDecimal(2, book.getPrice());
+            int insertedRows = createBookStatement.executeUpdate();
+            if (insertedRows < 1) {
+                throw new DataProcessingException("Expected to insert at least 1 row," +
+                        " but nothing was inserted by adding book: " + book);
+            }
+            ResultSet generatedKeys = createBookStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can t insert the book in db: " + book, e);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String getByIdQuery = "SELECT * FROM books WHERE id = ? AND is_deleted = FALSE;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement getByIdStatement =
+                        connection.prepareStatement(getByIdQuery)) {
+            getByIdStatement.setLong(1, id);
+            ResultSet resultSet = getByIdStatement.executeQuery();
+            Book book = null;
+            if (resultSet.next()) {
+                book = parseBookFromResultSet(resultSet);
+            }
+            return Optional.ofNullable(book);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find book by id: " + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String getAllQuery = "SELECT * FROM books WHERE is_deleted = FALSE;";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement getAllStatement =
+                     connection.prepareStatement(getAllQuery)) {
+            ResultSet resultSet = getAllStatement.executeQuery();
+            List<Book> booksList = new ArrayList<>();
+            while (resultSet.next()) {
+                booksList.add(parseBookFromResultSet(resultSet));
+            }
+            return booksList;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get all books from db", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String updateBookQuery = "UPDATE books SET title = ?, price = ? WHERE is_deleted = FALSE;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement updateBookStatement =
+                        connection.prepareStatement(updateBookQuery)) {
+            updateBookStatement.setString(1, book.getTitle());
+            updateBookStatement.setBigDecimal(2, book.getPrice());
+            int updatedRows = updateBookStatement.executeUpdate();
+            if (updatedRows < 1) {
+                throw new DataProcessingException("Rows were not updated for book" + book);
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book: " + book, e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String deleteByIdQuery = "UPDATE books SET is_deleted = TRUE WHERE id = ?;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement deleteByIdStatement =
+                        connection.prepareStatement(deleteByIdQuery)) {
+                deleteByIdStatement.setLong(1, id);
+                int deletedRows = deleteByIdStatement.executeUpdate();
+                return deletedRows > 0;
+            } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by id: " + id, e);
+        }
+    }
+
+    private Book parseBookFromResultSet(ResultSet resultSet) throws SQLException {
+        Book book = new Book();
+        book.setId(resultSet.getObject("id", Long.class));
+        book.setTitle(resultSet.getString("title"));
+        book.setPrice(resultSet.getObject("price", BigDecimal.class));
+        return book;
+    }
+}

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) {
+        super(message);
+    }
+
+    public DataProcessingException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

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

@@ -0,0 +1,72 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+import java.util.Objects;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book() {
+
+    }
+
+    public Book(Long id, String title, BigDecimal price) {
+        this.id = id;
+        this.price = price;
+        this.title = title;
+    }
+
+    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 int hashCode() {
+        return Objects.hash(id, title, price);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        Book book = (Book) obj;
+        return Objects.equals(id, book.id)
+                && Objects.equals(title, book.title)
+                && Objects.equals(price, book.price);
+    }
+
+    @Override
+    public String toString() {
+        return "Car{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price='" + price + '\''
+                + '}';
+    }
+}

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

@@ -0,0 +1,32 @@
+package mate.academy.util;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtil {
+    private static final String URL = "jdbc:mysql://localhost:3306/library_db";
+    private static final String USERNAME = "root";
+    private static final String PASSWORD = "Ghfnfnbg123";
+    private static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
+
+    static {
+        try {
+            Class.forName(JDBC_DRIVER);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't find SQL Driver", e);
+        }
+    }
+
+    public static Connection getConnection() {
+        Properties dbProperties = new Properties();
+        dbProperties.setProperty("user", USERNAME);
+        dbProperties.setProperty("password", PASSWORD);
+        try {
+            return DriverManager.getConnection(URL, dbProperties);
+        } catch (SQLException e) {
+            throw new RuntimeException("Can't create connection to DB ", e);
+        }
+    }
+}

src/main/java/resources/init_db.sql

@@ -0,0 +1,8 @@
+CREATE DATABASE `library_db` /*!40100 DEFAULT CHARACTER SET utf8mb3 */ /*!80016 DEFAULT ENCRYPTION='N' */;
+CREATE TABLE `book` (
+                        `id` bigint NOT NULL AUTO_INCREMENT,
+                        `title` varchar(255) DEFAULT NULL,
+                        `price` decimal(10,0) DEFAULT NULL,
+                        `is_deleted` tinyint NOT NULL DEFAULT '0',
+                        PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;