Task: jv-jdbc-intro. Executor: Oleksii Bashkirov.

pom.xml

@@ -18,6 +18,15 @@
         </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/Main.java

@@ -1,7 +1,55 @@
 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;
+import mate.academy.service.BookService;
+import mate.academy.service.impl.BookServiceImpl;
+
 public class Main {
+    private static final String PACKAGE_NAME = "mate.academy";
+    private static final Injector injector = Injector.getInstance(PACKAGE_NAME);
+
     public static void main(String[] args) {
+        var bookDao = (BookDao) injector.getInstance(BookDao.class);
+        var bookService = new BookServiceImpl(bookDao);
+        var newBook = saveNewBook(bookService);
+        getBookById(bookService, newBook);
+        updateBook(bookService, newBook);
+        getAllBooks(bookService);
+        deleteBook(bookService, newBook);
+    }
+
+    private static Book saveNewBook(BookService bookService) {
+        var newBook = new Book();
+        newBook.setTitle("New Book");
+        newBook.setPrice(BigDecimal.valueOf(30.99));
+        Book savedBook = bookService.save(newBook);
+        System.out.println("Saved book: " + savedBook);
+        return savedBook;
+    }
+
+    private static void getBookById(BookService bookService, Book savedBook) {
+        Optional<Book> bookById = bookService.get(savedBook.getId());
+        System.out.println("Book by id " + savedBook.getId() + " is: " + bookById.orElse(null));
+    }
+
+    private static void updateBook(BookService bookService, Book savedBook) {
+        savedBook.setTitle("New Book.Second Edition.");
+        savedBook.setPrice(BigDecimal.valueOf(35.99));
+        System.out.println("Updated book: " + bookService.update(savedBook));
+    }
+
+    private static void getAllBooks(BookService bookService) {
+        List<Book> allBooks = bookService.getAll();
+        allBooks.forEach(book -> System.out.println("Book: " + book));
+    }
 
+    private static void deleteBook(BookServiceImpl bookService, Book savedBook) {
+        boolean isDeleted = bookService.delete(savedBook.getId());
+        System.out.println("Deleted book with id " + savedBook.getId() + " : " + isDeleted);
     }
 }

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.model.Book;
+
+public interface BookDao {
+
+    Book save(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 +1,131 @@
+package mate.academy.dao.impl;
+
+import static java.sql.PreparedStatement.RETURN_GENERATED_KEYS;
+
+import java.math.BigDecimal;
+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.dao.BookDao;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+import mate.academy.util.ConnectionUtil;
+import mate.academy.util.SqlConsumer;
+import mate.academy.util.SqlFunction;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    private static final String SAVE_SQL = """
+            INSERT INTO books (title, price) 
+            VALUES(?, ?)
+            """;
+    private static final String UPDATE_SQL = """
+            UPDATE books 
+            SET title = ?, price = ? 
+            WHERE id = ?
+            """;
+    private static final String FIND_BY_ID_SQL = """
+            SELECT id, title, price 
+            FROM books 
+            WHERE id = ?
+            """;
+    private static final String FIND_ALL_SQL = """
+            SELECT id,
+            title,
+            price 
+            FROM books
+            """;
+    private static final String DELETE_BY_ID_SQL = """
+            DELETE FROM books
+            WHERE id = ?
+            """;
+
+    @Override
+    public Book save(Book book) {
+        try (var connection = ConnectionUtil.getConnection();
+                var preparedStatement =
+                        connection.prepareStatement(SAVE_SQL, RETURN_GENERATED_KEYS)) {
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setObject(2, book.getPrice());
+            preparedStatement.executeUpdate();
+            var generatedKeys = preparedStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                book.setId(generatedKeys.getLong(1));
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot save book: " + book, e);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        return executeQuery(FIND_BY_ID_SQL, ps -> ps.setLong(1, id), rs -> {
+            if (rs.next()) {
+                return Optional.of(mapResultSetToBook(rs));
+            }
+            return Optional.empty();
+        });
+    }
+
+    @Override
+    public List<Book> findAll() {
+        return executeQuery(FIND_ALL_SQL, ps -> {
+        }, rs -> {
+            List<Book> bookList = new ArrayList<>();
+            while (rs.next()) {
+                bookList.add(mapResultSetToBook(rs));
+            }
+            return bookList;
+        });
+    }
+
+    @Override
+    public Book update(Book book) {
+        executeUpdate(UPDATE_SQL, ps -> {
+            ps.setString(1, book.getTitle());
+            ps.setObject(2, book.getPrice());
+            ps.setLong(3, book.getId());
+        });
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        return executeUpdate(DELETE_BY_ID_SQL, ps -> ps.setLong(1, id));
+    }
+
+    private Book mapResultSetToBook(ResultSet resultSet) throws SQLException {
+        var book = new Book();
+        book.setId(resultSet.getLong("id"));
+        book.setTitle(resultSet.getString("title"));
+        book.setPrice(resultSet.getObject("price", BigDecimal.class));
+        return book;
+    }
+
+    private boolean executeUpdate(String sql, SqlConsumer<PreparedStatement> parameterSetter) {
+        try (var connection = ConnectionUtil.getConnection();
+                var preparedStatement = connection.prepareStatement(sql)) {
+            parameterSetter.accept(preparedStatement);
+            return preparedStatement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot execute update from SQL: " + sql, e);
+        }
+    }
+
+    private <T> T executeQuery(String sql, SqlConsumer<PreparedStatement> parameterSetter,
+                               SqlFunction<ResultSet, T> resultMapper) {
+        try (var connection = ConnectionUtil.getConnection();
+                var preparedStatement = connection.prepareStatement(sql)) {
+            parameterSetter.accept(preparedStatement);
+            var resultSet = preparedStatement.executeQuery();
+            return resultMapper.apply(resultSet);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot execute query for SQL: " + sql, e);
+        }
+    }
+}

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

@@ -0,0 +1,16 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+
+    public DataProcessingException() {
+        super();
+    }
+
+    public DataProcessingException(String message) {
+        super(message);
+    }
+
+    public DataProcessingException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

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

@@ -0,0 +1,62 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+import java.util.Objects;
+
+public class Book {
+    private long id;
+    private String title;
+    private BigDecimal 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 boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Book book = (Book) o;
+        return Objects.equals(id, book.id)
+                && Objects.equals(title, book.title)
+                && Objects.equals(price, book.price);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, title, price);
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price=" + price
+                + '}';
+    }
+}

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

@@ -0,0 +1,18 @@
+package mate.academy.service;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.model.Book;
+
+public interface BookService {
+
+    Book save(Book book);
+
+    Optional<Book> get(Long id);
+
+    List<Book> getAll();
+
+    Book update(Book book);
+
+    boolean delete(Long id);
+}

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

@@ -0,0 +1,43 @@
+package mate.academy.service.impl;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.dao.BookDao;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.model.Book;
+import mate.academy.service.BookService;
+
+public class BookServiceImpl implements BookService {
+
+    private final BookDao bookDao;
+
+    public BookServiceImpl(BookDao bookDao) {
+        this.bookDao = bookDao;
+    }
+
+    @Override
+    public Book save(Book book) {
+        return bookDao.save(book);
+    }
+
+    @Override
+    public Optional<Book> get(Long id) {
+        return Optional.ofNullable(bookDao.findById(id)
+                .orElseThrow(() -> new DataProcessingException("Cannot find book by id: " + id)));
+    }
+
+    @Override
+    public List<Book> getAll() {
+        return bookDao.findAll();
+    }
+
+    @Override
+    public Book update(Book book) {
+        return bookDao.update(book);
+    }
+
+    @Override
+    public boolean delete(Long id) {
+        return bookDao.deleteById(id);
+    }
+}