resolve jdbc-intro

pom.xml

@@ -18,6 +18,14 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.3.0</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 URL = "jdbc:mysql://localhost:3306/book_db";
+    private static final Properties PROPERTIES;
+
+    static {
+        PROPERTIES = new Properties();
+        PROPERTIES.put("user", "root");
+        PROPERTIES.put("password", "rootroot");
+        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(URL, PROPERTIES);
+    }
+}

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

@@ -1,7 +1,62 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+import mate.academy.service.BookService;
+import mate.academy.service.BookServiceImpl;
+
 public class Main {
+    private static final Injector injector = Injector.getInstance("mate.academy");
+    private static BookService service;
+
     public static void main(String[] args) {
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+        service = new BookServiceImpl(bookDao);
+
+        testCreate();
+        testFindAll();
+        testFindById();
+        testUpdate();
+        testDelete();
+        testFindAll();
+
+        service.deleteAll();
+    }
+
+    private static void testCreate() {
+        System.out.println("\nCREATE");
+        Book bookHarry = new Book("Harry", new BigDecimal(1222));
+        Book bookPotter = new Book("Potter", new BigDecimal(999));
+        Book bookLol = new Book("Lol", new BigDecimal(69));
+        Book bookKek = new Book("Kek", new BigDecimal(1488));
+        service.createBook(bookHarry);
+        service.createBook(bookPotter);
+        service.createBook(bookLol);
+        service.createBook(bookKek);
+    }
+
+    private static void testFindAll() {
+        System.out.println("\nFIND ALL");
+        for (var book : service.findAllBooks()) {
+            System.out.println(book);
+        }
+    }
+
+    private static void testFindById() {
+        System.out.println("\nFIND BY ID");
+        System.out.println(service.findBookById(3L));
+    }
+
+    private static void testDelete() {
+        System.out.println("\nDELETE");
+        service.deleteBookById(4L);
+    }
 
+    private static void testUpdate() {
+        System.out.println("\nUPDATE");
+        Book bookForUpdate = new Book(3L, "Update", new BigDecimal(12345));
+        service.updateBook(bookForUpdate);
     }
 }

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

@@ -0,0 +1,19 @@
+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);
+
+    boolean deleteAll();
+}

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

@@ -0,0 +1,139 @@
+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 book_db.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 DataProcessingException("expected insert at least 1 row, but was 0.",
+                        new RuntimeException());
+            }
+
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("can not add new book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM book_db.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(mapToBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("can not find book by id : " + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sql = "SELECT * FROM book_db.books";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            ResultSet resultSet = statement.executeQuery();
+            List<Book> books = new ArrayList<>();
+
+            while (resultSet.next()) {
+                books.add(mapToBook(resultSet));
+            }
+
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not find all books", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sql = "UPDATE book_db.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 rowsAffected = statement.executeUpdate();
+            System.out.println("Rows updated: " + rowsAffected);
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not find all books", e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM book_db.books WHERE id = ?";
+
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+
+            statement.setLong(1, id);
+
+            int rowsAffected = statement.executeUpdate();
+            System.out.println("Rows deleted: " + rowsAffected);
+            return rowsAffected > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not find all books", e);
+        }
+    }
+
+    @Override
+    public boolean deleteAll() {
+        String sql = "DELETE FROM book_db.books";
+
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+
+            int rowsAffected = statement.executeUpdate();
+            System.out.println("Deleted " + rowsAffected + " rows from table books");
+            return rowsAffected > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not delete all books", e);
+        }
+    }
+
+    private Book mapToBook(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getObject("id", Long.class);
+        String title = resultSet.getString("title");
+        BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+        return new Book(id, title, 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 ex) {
+        super(message, ex);
+    }
+}

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

@@ -0,0 +1,54 @@
+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 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/java/mate/academy/service/BookService.java

@@ -0,0 +1,19 @@
+package mate.academy.service;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.model.Book;
+
+public interface BookService {
+    Book createBook(Book book);
+
+    Optional<Book> findBookById(Long id);
+
+    List<Book> findAllBooks();
+
+    Book updateBook(Book book);
+
+    boolean deleteBookById(Long id);
+
+    boolean deleteAll();
+}

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

@@ -0,0 +1,44 @@
+package mate.academy.service;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.dao.BookDao;
+import mate.academy.model.Book;
+
+public class BookServiceImpl implements BookService {
+    private final BookDao bookDao;
+
+    public BookServiceImpl(BookDao bookDao) {
+        this.bookDao = bookDao;
+    }
+
+    @Override
+    public Book createBook(Book book) {
+        return bookDao.create(book);
+    }
+
+    @Override
+    public Optional<Book> findBookById(Long id) {
+        return bookDao.findById(id);
+    }
+
+    @Override
+    public List<Book> findAllBooks() {
+        return bookDao.findAll();
+    }
+
+    @Override
+    public Book updateBook(Book book) {
+        return bookDao.update(book);
+    }
+
+    @Override
+    public boolean deleteBookById(Long id) {
+        return bookDao.deleteById(id);
+    }
+
+    @Override
+    public boolean deleteAll() {
+        return bookDao.deleteAll();
+    }
+}