Hw 23 solution

pom.xml

@@ -18,6 +18,14 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.4.0</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -1,7 +1,47 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.models.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 final BigDecimal NEW_PRICE = new BigDecimal("120.50");
+
     public static void main(String[] args) {
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+        BookService bookService = new BookServiceImpl(bookDao);
+
+        List<Book> savedBooks = new ArrayList<>();
+        Map.of("Java", new BigDecimal(300),
+                "Python", new BigDecimal(200),
+                "C++", new BigDecimal(100))
+                .forEach((key, value) -> {
+                    Book currentBook = new Book();
+                    currentBook.setTitle(key);
+                    currentBook.setPrice(value);
+                    savedBooks.add(bookService.save(currentBook));
+                });
+        System.out.println("savedBooks = " + savedBooks);
+
+        Book book = bookService.get(2L);
+        System.out.printf("Method get return: " + book);
+
+        book.setPrice(book.getPrice().multiply(NEW_PRICE));
+        book = bookService.update(book);
+        System.out.printf("Method update return: " + book);
+
+        boolean isDeleteBook = bookService.delete(savedBooks.get(0));
+        System.out.printf("Method delete return: " + isDeleteBook);
 
+        List<Book> bookList2 = bookService.getAll();
+        System.out.printf("Method getAll return: " + bookList2.toString());
     }
 }

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

@@ -0,0 +1,18 @@
+package mate.academy.dao;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.models.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 +1,122 @@
+package mate.academy.dao;
+
+import java.math.BigDecimal;
+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.exceptions.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.models.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    @Override
+    public Book create(Book book) {
+        String sql = "INSERT INTO books (title, price) VALUE (?, ?)";
+        try (PreparedStatement prepareStatement = ConnectionUtilImpl.getConnection()
+                     .prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+
+            prepareStatement.setString(1, book.getTitle());
+            prepareStatement.setBigDecimal(2, book.getPrice());
+
+            if (prepareStatement.executeUpdate() > 1) {
+                book.setId(getIdFromResultSet(prepareStatement.getGeneratedKeys()));
+                return book;
+            }
+            throw new DataProcessingException("Can't save the new book: " + book);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't save a book: " + book, e);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM books WHERE id = ?";
+        try (PreparedStatement prepareStatement = ConnectionUtilImpl.getConnection()
+                .prepareStatement(sql)) {
+
+            prepareStatement.setLong(1, id);
+
+            return getBookFromResultSet(prepareStatement.executeQuery());
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get a book by id: " + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sql = "SELECT * FROM books";
+        try (PreparedStatement prepareStatement = ConnectionUtilImpl.getConnection()
+                .prepareStatement(sql)) {
+
+            return getAllFromResultSet(prepareStatement.executeQuery());
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get any books from the database", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sql = "UPDATE books SET title = ?, price = ?) WHERE id = ?";
+        try (PreparedStatement prepareStatement = ConnectionUtilImpl.getConnection()
+                .prepareStatement(sql)) {
+
+            prepareStatement.setString(1, book.getTitle());
+            prepareStatement.setBigDecimal(2, book.getPrice());
+            prepareStatement.setLong(3, book.getId());
+
+            if (prepareStatement.executeUpdate() > 1) {
+                return book;
+            }
+            throw new DataProcessingException("Can't update the book: " + book);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update the book: " + book, e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM books WHERE id = ?";
+        try (PreparedStatement prepareStatement = ConnectionUtilImpl.getConnection()
+                .prepareStatement(sql)) {
+
+            prepareStatement.setLong(1, id);
+
+            return prepareStatement.executeUpdate() > 1;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete the book by id: " + id, e);
+        }
+    }
+
+    private Long getIdFromResultSet(ResultSet generatedKeys) throws SQLException {
+        if (generatedKeys.next()) {
+            return generatedKeys.getObject(1, Long.class);
+        }
+        throw new DataProcessingException("Can't writing the book to the database, missing ID");
+    }
+
+    private Optional<Book> getBookFromResultSet(ResultSet resultSet) throws SQLException {
+        if (resultSet.next()) {
+            Book book = new Book();
+
+            book.setId(resultSet.getObject("id", Long.class));
+            book.setTitle(resultSet.getString("title"));
+            book.setPrice(resultSet.getObject("price", BigDecimal.class));
+
+            return Optional.of(book);
+        }
+        return Optional.empty();
+    }
+
+    private List<Book> getAllFromResultSet(ResultSet resultSet) throws SQLException {
+        List<Book> bookList = new ArrayList<>();
+        do {
+            getBookFromResultSet(resultSet).ifPresent(bookList::add);
+        } while (resultSet.next());
+        return bookList;
+    }
+}

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

@@ -0,0 +1,4 @@
+package mate.academy.dao;
+
+public interface ConnectionUtil {
+}

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

@@ -0,0 +1,30 @@
+package mate.academy.dao;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtilImpl implements ConnectionUtil {
+    private static final String USER = "root";
+    private static final String PASSWORD = "illya";
+    private static final String DB_URL = "jdbs.mysql://localhost:3306/my_db";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", USER);
+        DB_PROPERTIES.put("password", PASSWORD);
+
+        try {
+            Class.forName("com.mysql.cj.jdbs.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can not load JDBS driver", e);
+        }
+    }
+
+    static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+
+}

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

@@ -0,0 +1,12 @@
+package mate.academy.exceptions;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message) {
+        super(message);
+    }
+
+    public DataProcessingException(String message, Throwable cause) {
+        super(message, cause);
+
+    }
+}

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

@@ -1,8 +1,4 @@
 package mate.academy.lib;
 
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-
-@Retention(RetentionPolicy.RUNTIME)
 public @interface Dao {
 }

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

@@ -0,0 +1,45 @@
+package mate.academy.models;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book() {
+    }
+
+    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 +1,16 @@
+package mate.academy.service;
+
+import java.util.List;
+import mate.academy.models.Book;
+
+public interface BookService {
+    Book save(Book book);
+
+    Book get(Long id);
+
+    List<Book> getAll();
+
+    Book update(Book book);
+
+    boolean delete(Book book);
+}

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

@@ -0,0 +1,60 @@
+package mate.academy.service;
+
+import java.util.List;
+import mate.academy.dao.BookDao;
+import mate.academy.exceptions.DataProcessingException;
+import mate.academy.models.Book;
+
+public class BookServiceImpl implements BookService {
+    private final BookDao bookDao;
+
+    public BookServiceImpl(BookDao bookDao) {
+        if (bookDao == null) {
+            throw new DataProcessingException("The argument (bookDao) is null");
+        }
+        this.bookDao = bookDao;
+    }
+
+    @Override
+    public Book save(Book book) {
+        if (book == null) {
+            throw new DataProcessingException("The argument (book) is null");
+        }
+        return bookDao.create(book);
+    }
+
+    @Override
+    public Book get(Long id) {
+        if (id == null) {
+            throw new DataProcessingException("The argument (id) is null");
+        }
+        return bookDao.findById(id)
+                .orElseThrow(() -> new DataProcessingException("Can't find a book with id: "
+                        + id));
+    }
+
+    @Override
+    public List<Book> getAll() {
+        List<Book> bookList = bookDao.findAll();
+        if (bookList.isEmpty()) {
+            throw new DataProcessingException("Can't get any books from the database");
+        }
+        return bookList;
+    }
+
+    @Override
+    public Book update(Book book) {
+        if (book == null) {
+            throw new DataProcessingException("The argument (book) is null");
+        }
+        return bookDao.update(book);
+    }
+
+    @Override
+    public boolean delete(Book book) {
+        if (book == null || book.getId() == null) {
+            throw new DataProcessingException("The argument (book) or id is null");
+        }
+        return bookDao.deleteById(book.getId());
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,7 @@
+CREATE DATABASE `my_db`;
+USE my_db;
+CREATE TABLE books (
+    id BIGINT PRIMARY KEY,
+    title VARCHAR(50),
+    price DECIMAL(10,2)
+    );