implement task

pom.xml

@@ -18,6 +18,14 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.4.0</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -0,0 +1,39 @@
+package mate.academy;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+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/jv-jdbc-intro";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", getPassword());
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load the JDBC driver.", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+
+    private static String getPassword() {
+        String path = "src/main/resources/pswrd.txt";
+        try {
+            return Files.readString(Path.of(path));
+
+        } catch (IOException e) {
+            throw new RuntimeException("Can't read a file with path: " + path, e);
+        }
+    }
+}

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

@@ -1,7 +1,30 @@
 package mate.academy;
 
+import java.math.BigInteger;
+import mate.academy.dao.BookDao;
+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 = (BookDao) injector.getInstance(BookDao.class);
+        // create
+        Book book = new Book();
+        book.setTitle("Java Programming");
+        book.setPrice(100.00);
+        System.out.println(bookDao.create(book));
+        // update
+        Book bookUpdate = new Book();
+        bookUpdate.setTitle("Updated title");
+        bookUpdate.setPrice(200.00);
+        bookUpdate.setId(new BigInteger("1"));
+        System.out.println(bookDao.update(bookUpdate));
+        // findById
+        System.out.println(bookDao.findById(2L));
+        // findAll
+        System.out.println(bookDao.findAll());
+        // deleteById
+        System.out.println(bookDao.deleteById(1L));
     }
 }

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 +1,126 @@
+package mate.academy.dao;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+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 {
+    @Override
+    public Book create(Book book) {
+        String query = "INSERT INTO books (title, price) VALUES (?, ?)";
+        try (
+                Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query, Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setDouble(2, book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new RuntimeException(
+                        "Expected to insert at least one row, but inserted 0 rows.");
+            }
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                BigInteger id = generatedKeys.getObject(1, BigInteger.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't create a book " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String query = "SELECT * FROM books WHERE id = ?";
+        try (
+                Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setLong(1, id);
+            statement.executeQuery();
+            ResultSet resultSet = statement.getResultSet();
+            if (resultSet.next()) {
+                Book book = new Book();
+                book.setId(resultSet.getObject("id", BigInteger.class));
+                book.setTitle(resultSet.getObject("title", String.class));
+                book.setPrice(resultSet.getObject("price", Double.class));
+                return Optional.of(book);
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        String query = "SELECT * FROM books";
+        try (
+                Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                do {
+                    Book book = new Book();
+                    book.setId(resultSet.getObject("id", BigInteger.class));
+                    book.setTitle(resultSet.getObject("title", String.class));
+                    book.setPrice(resultSet.getObject("price", Double.class));
+                    books.add(book);
+                } while (resultSet.next());
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        String query = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+        try (
+                Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setString(1, book.getTitle());
+            statement.setDouble(2, book.getPrice());
+            statement.setBigDecimal(3, new BigDecimal(book.getId()));
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new RuntimeException(
+                        "Expected to update at least one row, but updated 0 rows.");
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String query = "DELETE FROM books WHERE id = ?";
+        try (
+                Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setLong(1, id);
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new RuntimeException(
+                        "Expected to delete at least one row, but deleted 0 rows.");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book where id = " + id, e);
+        }
+        return true;
+    }
+}

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.BigInteger;
+
+public class Book {
+    private BigInteger id;
+    private String title;
+    private double price;
+
+    public BigInteger getId() {
+        return id;
+    }
+
+    public void setId(BigInteger id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price=" + price
+                + '}';
+    }
+}

src/main/java/mate/academy/service/BookService.java

@@ -0,0 +1,17 @@
+package mate.academy.service;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.model.Book;
+
+public interface BookService {
+    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/service/impl/BookServiceImpl.java

@@ -0,0 +1,36 @@
+package mate.academy.service.impl;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.dao.BookDao;
+import mate.academy.model.Book;
+import mate.academy.service.BookService;
+
+public class BookServiceImpl implements BookService {
+    private BookDao bookDao;
+
+    @Override
+    public Book create(Book book) {
+        return bookDao.create(book);
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        return bookDao.findById(id);
+    }
+
+    @Override
+    public List<Book> findAll() {
+        return bookDao.findAll();
+    }
+
+    @Override
+    public Book update(Book book) {
+        return bookDao.update(book);
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        return bookDao.deleteById(id);
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,6 @@
+CREATE TABLE books (
+    id BIGINIT NOT NULL AUTO_INCREMENT,
+    title VARCHAR(100),
+    price DECIMAL(10, 2),
+    PRIMARY KEY (id)
+);

src/main/resources/pswrd.txt

@@ -0,0 +1 @@
+My66524407m