jdbc-solution - V1.0

pom.xml

@@ -17,7 +17,13 @@
             https://raw.githubusercontent.com/mate-academy/style-guides/master/java/checkstyle.xml
         </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 +1,34 @@
 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();
+        book.setTitle("Dune");
+        book.setPrice(BigDecimal.valueOf(19.99));
+        bookDao.create(book);
+
+        // Testing other methods
+        Optional<Book> foundBook = bookDao.findById(book.getId());
+        foundBook.ifPresent(System.out::println);
+
+        List<Book> allBooks = bookDao.findAll();
+        System.out.println("All Books: " + allBooks);
+
+        book.setTitle("Lisan al gaib");
+        bookDao.update(book);
+        System.out.println("Updated Book: " + book);
 
+        boolean deleted = bookDao.deleteById(book.getId());
+        System.out.println("Deleted: " + deleted);
     }
 }

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

@@ -0,0 +1,35 @@
+package mate.academy.connection;
+
+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 DRIVER = "com.mysql.cj.jdbc.Driver";
+    private static final String DB_PATH = "jdbc:mysql://localhost:3306/jdbc";
+    private static final String USER = "root";
+    private static final String PASSWORD = "MySQL1234";
+    private static final Properties PROPERTIES;
+
+    static {
+        PROPERTIES = new Properties();
+        PROPERTIES.put("user", USER);
+        PROPERTIES.put("password", PASSWORD);
+
+        try {
+            Class.forName(DRIVER);
+        } catch (ClassNotFoundException e) {
+            throw new DataProcessingException("Something wrong with Driver", e);
+        }
+    }
+
+    public static Connection getConnection() {
+        try {
+            return DriverManager.getConnection(DB_PATH, PROPERTIES);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to establish database connection", e);
+        }
+    }
+}

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 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 +1,126 @@
+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.connection.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 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 to insert at least one row, but inserted 0 rows for book: "
+                                + book);
+            }
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't save new book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        Book book = null;
+        String sql = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                book = mapResultToBook(resultSet);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get a book by id " + id, e);
+        }
+        return Optional.ofNullable(book);
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        String sql = "SELECT * FROM books";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                Book book = mapResultToBook(resultSet);
+                books.add(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't fetch books", e);
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sql = "UPDATE 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 affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new DataProcessingException(
+                        "Expected to update at least one row, but updated 0 rows for book: "
+                                + book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update a book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM books WHERE id = ?";
+        int affectedRows;
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            affectedRows = statement.executeUpdate();
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete a book with id: " + id, e);
+        }
+        return affectedRows > 0;
+    }
+
+    private Book mapResultToBook(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getLong("id");
+        String title = resultSet.getString("title");
+        BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+
+        Book book = new Book();
+        book.setId(id);
+        book.setTitle(title);
+        book.setPrice(price);
+        return book;
+    }
+}

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

@@ -0,0 +1,11 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable ex) {
+        super(message, ex);
+    }
+
+    public DataProcessingException(String message) {
+        super(message);
+    }
+}

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

@@ -0,0 +1,41 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+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 String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price=" + price + '}';
+    }
+}

src/main/resources/init_db.sql

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