Mydb

pom.xml

@@ -18,6 +18,16 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>
@@ -55,4 +65,5 @@
             </plugins>
         </pluginManagement>
     </build>
+
 </project>

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

@@ -1,7 +1,41 @@
 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);
+
+        List<Book> books = List.of(
+               new Book("OnePiece", new BigDecimal(195)),
+               new Book("Naruto", new BigDecimal(235)),
+               new Book("Jujutsu Kaisen", new BigDecimal(243))
+        );
+
+        books.forEach(bookDao::create);
+
+        Book book1Update = new Book(1L, "OnePiece", new BigDecimal(250));
+        Book updatedBook = bookDao.update(book1Update);
+        System.out.println("Updated book: " + updatedBook);
+
+        List<Book> allBooks = bookDao.findAll();
+        System.out.println("All books:");
+        allBooks.forEach(System.out::println);
+
+        Optional<Book> bookById = bookDao.findById(1L);
+        System.out.println("Book found by id: " + bookById.orElse(null));
+
+        bookDao.deleteById(3L);
 
+        List<Book> listAfterDelete = bookDao.findAll();
+        System.out.println("List after delete by id:");
+        listAfterDelete.forEach(System.out::println);
     }
 }

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 +1,164 @@
+package mate.academy.dao;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import mate.academy.exception.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 (?, ?)";
+        Connection connection = null;
+        PreparedStatement preparedStatement = null;
+        ResultSet generatedKeys = null;
+        try {
+            connection = ConnectionUtil.getConnection();
+            preparedStatement = connection.prepareStatement(
+                   query, PreparedStatement.RETURN_GENERATED_KEYS);
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            int affectedRows = preparedStatement.executeUpdate();
+            if (affectedRows == 0) {
+                throw new DataProcessingException(
+                       "Creating book failed, no rows affected.", new SQLException());
+            }
+            generatedKeys = preparedStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getLong(1);
+                book.setId(id);
+            } else {
+                throw new DataProcessingException(
+                       "Creating book failed, no ID obtained.", new SQLException());
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to create a book", e);
+        } finally {
+            closeResources(connection, preparedStatement, generatedKeys);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String query = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement =
+                         connection.prepareStatement(query)) {
+            preparedStatement.setLong(1, id);
+            try (ResultSet resultSet = preparedStatement.executeQuery()) {
+                if (resultSet.next()) {
+                    return Optional.of(new Book(
+                           resultSet.getLong("id"),
+                           resultSet.getString("title"),
+                           resultSet.getBigDecimal("price")));
+                }
+            }
+            return Optional.empty();
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to find a book by id: " + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String query = "SELECT * FROM books";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(query);
+                ResultSet resultSet = preparedStatement.executeQuery()) {
+            List<Book> books = new ArrayList<>();
+            while (resultSet.next()) {
+                books.add(new Book(
+                        resultSet.getLong("id"),
+                        resultSet.getString("title"),
+                        resultSet.getBigDecimal("price")));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to find all books", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String query = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+        Connection connection = null;
+        PreparedStatement preparedStatement = null;
+        try {
+            connection = ConnectionUtil.getConnection();
+            preparedStatement = connection.prepareStatement(query);
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            preparedStatement.setLong(3, book.getId());
+            int affectedRows = preparedStatement.executeUpdate();
+            if (affectedRows == 0) {
+                throw new DataProcessingException(
+                       "Updating book failed, no rows affected.", new SQLException());
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to update a book", e);
+        } finally {
+            closeResources(connection, preparedStatement);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String query = "DELETE FROM books WHERE id = ?";
+        Connection connection = null;
+        PreparedStatement preparedStatement = null;
+        try {
+            connection = ConnectionUtil.getConnection();
+            preparedStatement = connection.prepareStatement(query);
+            preparedStatement.setLong(1, id);
+            int affectedRows = preparedStatement.executeUpdate();
+            if (affectedRows == 0) {
+                throw new DataProcessingException(
+                       "Deleting book failed, no rows affected.", new SQLException());
+            }
+            return affectedRows > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to delete a book with id: " + id, e);
+        } finally {
+            closeResources(connection, preparedStatement);
+        }
+    }
+
+    private void closeResources(Connection connection, PreparedStatement preparedStatement) {
+        closeResources(connection, preparedStatement, null);
+    }
+
+    private void closeResources(Connection connection,
+                                PreparedStatement preparedStatement, ResultSet resultSet) {
+        if (resultSet != null) {
+            try {
+                resultSet.close();
+            } catch (SQLException e) {
+                throw new DataProcessingException("Failed to close ResultSet", e);
+            }
+        }
+        if (preparedStatement != null) {
+            try {
+                preparedStatement.close();
+            } catch (SQLException e) {
+                throw new DataProcessingException("Failed to close PreparedStatement", e);
+            }
+        }
+        if (connection != null) {
+            try {
+                connection.close();
+            } catch (SQLException e) {
+                throw new DataProcessingException("Failed to close Connection", e);
+            }
+        }
+    }
+}

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 +1,53 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book(String title, BigDecimal price) {
+        this.title = title;
+        this.price = 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 +1,36 @@
+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 DB_URL =
+            "jdbc:mysql://localhost:3306/mydatabase?serverTimezone=UTC";
+    private static final Properties DB_PROPERTIES;
+    private static Connection connection;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "mary");
+        DB_PROPERTIES.put("password", "1905Z");
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can not load JDBC driver", e);
+        }
+    }
+
+    private ConnectionUtil() {
+
+    }
+
+    public static Connection getConnection() throws SQLException {
+        if (connection == null || connection.isClosed()) {
+            connection = DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+        }
+        return connection;
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS books (
+id BIGINT NOT NULL AUTO_INCREMENT,
+title VARCHAR(255),
+price INT,
+PRIMARY KEY(id)
+);