I did a task on working with JDBC. And implemented methods based on G…

pom.xml

@@ -18,6 +18,15 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>9.0.0</version>
+        </dependency>
+
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -0,0 +1,27 @@
+package mate.academy;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+import mate.academy.exception.DataProcessingException;
+
+public class ConnectionUtil {
+    private static final String DB_URL = "jdbc:mysql://localhost:3306/test";
+    private static final Properties DB_PROPERTIES = new Properties();
+
+    static {
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "Root1234");
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new DataProcessingException("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 +1,33 @@
 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 book = new Book(1L, "Java Programming", new BigDecimal("29.99"));
+        Book book1 = new Book(2L, "Java", new BigDecimal("30.25"));
+        bookDao.create(book);
+        bookDao.create(book1);
+
+        Optional<Book> retrievedBook = bookDao.findById(book.getId());
+        System.out.println(retrievedBook);
+
+        book.setTitle("Advanced Java Programming");
+        bookDao.update(book);
+
+        List<Book> allBooks = bookDao.findAll();
+        allBooks.forEach(System.out::println);
+
+        bookDao.deleteById(book.getId());
     }
 }

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

@@ -0,0 +1,20 @@
+package mate.academy.dao;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+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 +1,111 @@
+package mate.academy.dao;
+
+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 {
+    private static final String CREATE_BOOK_QUERY
+            = "INSERT INTO books (title, price) VALUES (?, ?)";
+    private static final String FIND_BY_ID_QUERY = "SELECT * FROM books WHERE id = ?";
+    private static final String FIND_ALL_QUERY = "SELECT * FROM books";
+    private static final String UPDATE_BOOK_QUERY
+            = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+    private static final String DELETE_BY_ID_QUERY = "DELETE FROM books WHERE id = ?";
+
+    @Override
+    public Book create(Book book) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement =
+                        connection.prepareStatement(CREATE_BOOK_QUERY,
+                                Statement.RETURN_GENERATED_KEYS)) {
+
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.executeUpdate();
+
+            ResultSet resultSet = statement.getGeneratedKeys();
+            if (resultSet.next()) {
+                book.setId(resultSet.getLong(1));
+            }
+            return book;
+
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to insert book " + book + " into DB", e);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(FIND_BY_ID_QUERY)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                Book book = mapToBook(resultSet);
+                return Optional.of(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to retrieve book with id " + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(FIND_ALL_QUERY);
+                ResultSet resultSet = statement.executeQuery()) {
+            while (resultSet.next()) {
+                books.add(mapToBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get all books from DB", e);
+        }
+
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(UPDATE_BOOK_QUERY)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            statement.executeUpdate();
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book " + book, e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(DELETE_BY_ID_QUERY)) {
+            statement.setLong(1, id);
+            int rowsAffected = statement.executeUpdate();
+            return rowsAffected > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to delete book with id " + id, e);
+        }
+    }
+
+    Book mapToBook(ResultSet resultSet) throws SQLException {
+        return new Book(resultSet.getLong("id"),
+                resultSet.getString("title"),
+                resultSet.getBigDecimal("price"));
+    }
+}

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 cause) {
+        super(message, cause);
+    }
+}

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

@@ -0,0 +1,48 @@
+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/resourses/init_db.sql

@@ -0,0 +1,7 @@
+CREATE TABLE books (
+    id INT NOT NULL AUTO_INCREMENT,
+    title VARCHAR(255) NOT NULL,
+    price DECIMAL(10, 2) NOT NULL,
+    PRIMARY KEY (id)
+);
+