implemented dao and model for book

pom.xml

@@ -18,6 +18,14 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.30</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -1,7 +1,46 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.List;
+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);
+        List<Book> books = List.of(
+                new Book(null, "Book1", new BigDecimal(100)),
+                new Book(null, "Book2", new BigDecimal(150)),
+                new Book(null, "Book3", new BigDecimal(50))
+        );
+
+        books.forEach(bookDao::create);
+        System.out.println("Created books:");
+        books.forEach(System.out::println);
+        System.out.println();
+
+        Long bookId = 2L;
+        System.out.println("Book with id = [" + bookId + "]");
+        bookDao.findById(bookId).ifPresent(System.out::println);
+        System.out.println();
+
+        System.out.println("All books in the table:");
+        bookDao.findAll().forEach(System.out::println);
+        System.out.println();
+
+        Book anyBook = books.stream().findAny().orElseThrow();
+        anyBook.setTitle("Updated title");
+        Book anyUpdatedBook = bookDao.update(anyBook);
+        System.out.println("Updated book:");
+        System.out.println(anyUpdatedBook);
+        System.out.println();
 
+        boolean isDeleted = bookDao.deleteById(anyUpdatedBook.getId());
+        System.out.println("Is book with id = ["
+                + anyUpdatedBook.getId() + "] deleted = ["
+                + isDeleted + "]");
     }
 }

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/impl/BookDaoImpl.java

@@ -0,0 +1,116 @@
+package mate.academy.dao.impl;
+
+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.dao.BookDao;
+import mate.academy.exceptions.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+import mate.academy.util.ConnectionUtil;
+
+@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.setBigDecimal(2, book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new DataProcessingException("Expected to affect at least one row, "
+                        + "but got affected = [" + affectedRows + "]");
+            }
+            ResultSet resultSet = statement.getGeneratedKeys();
+            if (resultSet.next()) {
+                Long id = resultSet.getLong(1);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to 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);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                Book book = getBookFromResultSet(resultSet);
+                return Optional.of(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to find a book with id = [" + id + "]", e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String query = "SELECT * FROM books";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection()) {
+            PreparedStatement statement = connection.prepareStatement(query);
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                Book book = getBookFromResultSet(resultSet);
+                books.add(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to fetch all books", 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.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new DataProcessingException("Expected to affect at least one row, "
+                        + "but got affected = [" + affectedRows + "]");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to update a book = [" + book + "]", e);
+        }
+        return book;
+    }
+
+    @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);
+            return statement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to delete a book "
+                    + "with id = [" + id + "]", e);
+        }
+    }
+
+    private Book getBookFromResultSet(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getObject("id", Long.class);
+        String title = resultSet.getString("title");
+        BigDecimal price = resultSet.getBigDecimal("price");
+        return new Book(id, title, price);
+    }
+}

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

@@ -0,0 +1,11 @@
+package mate.academy.exceptions;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable e) {
+        super(message, e);
+    }
+
+    public DataProcessingException(String message) {
+        super(message);
+    }
+}

src/main/java/mate/academy/lib/Dao.java

@@ -1,8 +1,11 @@
 package mate.academy.lib;
 
+import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 
+@Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Dao {
 }

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

@@ -0,0 +1,47 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book(Long id, String title, BigDecimal price) {
+        this.id = id;
+        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/java/mate/academy/util/ConnectionUtil.java

@@ -0,0 +1,30 @@
+package mate.academy.util;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+import mate.academy.exceptions.DataProcessingException;
+
+public class ConnectionUtil {
+    private static final Properties DB_PROPERTIES;
+    private static final String URL = "jdbc:mysql://localhost:3306/mate";
+    private static final String USER = "root";
+    private static final String PASSWORD = "password";
+    private static final String DRIVER = "com.mysql.cj.jdbc.Driver";
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", USER);
+        DB_PROPERTIES.put("password", PASSWORD);
+        try {
+            Class.forName(DRIVER);
+        } catch (ClassNotFoundException e) {
+            throw new DataProcessingException("Failed to load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(URL, DB_PROPERTIES);
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,5 @@
+CREATE TABLE books(
+   id bigint AUTO_INCREMENT PRIMARY KEY,
+   title varchar(255) NOT NULL,
+   price DECIMAL(10, 2) NOT NULL
+);