created, fixed classes and files in jv-jdbc-intro task

pom.xml

@@ -55,4 +55,11 @@
             </plugins>
         </pluginManagement>
     </build>
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.3.0</version>
+        </dependency>
+    </dependencies>
 </project>

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_PATH = "jdbc:mysql://localhost:3306/intro";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "root1234");
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_PATH, DB_PROPERTIES);
+    }
+}

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

@@ -1,7 +1,31 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+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 firstBook = new Book("A Story of yesterday", new BigDecimal("150.50"));
+        bookDao.create(firstBook);
+        Book secondBook = new Book("A Love story", new BigDecimal("332.17"));
+        bookDao.create(secondBook);
+        Book thirdBook = new Book("The elephant tree", new BigDecimal("245.83"));
+        bookDao.create(thirdBook);
+        Book fourthBook = new Book("This is not a novel", new BigDecimal("157.74"));
+        bookDao.create(fourthBook);
 
+        System.out.println(bookDao.findById(2L));
+        secondBook.setPrice(new BigDecimal("196.59"));
+        System.out.println(bookDao.update(secondBook));
+        System.out.println(bookDao.findById(2L));
+        System.out.println(bookDao.findAll());
+        System.out.println(bookDao.deleteById(3L));
+        System.out.println(bookDao.findAll());
     }
 }

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 +1,114 @@
+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 {
+    @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());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new RuntimeException("Expected to insert 1 row, "
+                        + "but inserted 0 rows");
+            }
+            ResultSet generateKeys = statement.getGeneratedKeys();
+            if (generateKeys.next()) {
+                Long id = generateKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't add 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()) {
+                return Optional.of(createNewBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find book by id" + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @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()) {
+                books.add(createNewBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get a list of books from table", 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());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new RuntimeException("Expected to update 1 row, "
+                        + "but updated 0 rows");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update data of the book " + book, e);
+        }
+        return book;
+    }
+
+    @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 updatedRows = statement.executeUpdate();
+            return updatedRows > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete the book with id " + id, e);
+        }
+    }
+
+    private Book createNewBook(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 +1,7 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable ex) {
+        super();
+    }
+}

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

@@ -0,0 +1,49 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book() {
+    }
+
+    public Book(String title, BigDecimal price) {
+        this.title = title;
+        this.price = 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/resources/init_db.sql

@@ -0,0 +1,6 @@
+CREATE TABLE books (
+    id BIGINT AUTO_INCREMENT,
+    title VARCHAR(255),
+    price DECIMAL(10, 2),
+    PRIMARY KEY (id)
+);