JDBC Intro Solution

pom.xml

@@ -14,4 +14,12 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.1.0</version>
+        </dependency>
+    </dependencies>
+
 </project>

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

@@ -1,7 +1,38 @@
 package mate.academy;
 
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+
 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 marquezBook = new Book("One Hundred Years of Solitude", new BigDecimal(571));
+        Book rowlingBook = new Book(5L, "Harry Potter and the Half-Blood Prince", new BigDecimal(250));
+        Book secondMarquezBook = new Book(2L, "No One Writes to the Colonel", new BigDecimal(450));
+
+//        Book bookUpdated = bookDao.create(marquezBook);
+//        Book bookUpdated2 = bookDao.create(rowlingBook);
+//        System.out.println(bookUpdated);
+//        System.out.println(bookUpdated2);
+//
+//        Optional<Book> bookById = bookDao.findById(3L);
+//        System.out.println(bookById);
+//
+//        List<Book> allBooks = bookDao.findAll();
+//        for (Book element : allBooks) {
+//            System.out.println(element);
+//        }
+//
+//        Book updateBook = bookDao.update(rowlingBook);
+//        System.out.println(updateBook);
 
+        boolean deleteBook = bookDao.deleteById(4L);
+        System.out.println(deleteBook);
     }
 }

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

@@ -0,0 +1,28 @@
+package mate.academy.connection.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/test";
+    private static final Properties DB_PROPERTIES;
+    private static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
+    private static final String JDBC_DRIVER_EXCEPTION = "Cannot load JDBC driver";
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "Root1234");
+        try {
+            Class.forName(JDBC_DRIVER);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(JDBC_DRIVER_EXCEPTION, e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

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

@@ -0,0 +1,17 @@
+package mate.academy.dao;
+
+import mate.academy.model.Book;
+import java.util.List;
+import java.util.Optional;
+
+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 +1,107 @@
+package mate.academy.dao;
+
+import mate.academy.connection.util.ConnectionUtil;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+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;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    private static final int AT_LEAST_ONE = 0;
+
+    @Override
+    public Book create(Book book) {
+        String sqlUpdate = "INSERT INTO books (title, price) VALUES (?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sqlUpdate, Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.executeUpdate();
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot add new book: " + book, e);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        Book book = null;
+        String sqlQuery = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sqlQuery)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                book = parseBook(resultSet);
+            }
+            return Optional.ofNullable(book);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot get a book by id: " + id, e);
+        }
+    }
+
+        @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        String sqlQuery = "SELECT * FROM books";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sqlQuery)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                books.add(parseBook(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot get books", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sqlUpdate = "UPDATE books SET price = ?, title = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sqlUpdate)) {
+            statement.setBigDecimal(1, book.getPrice());
+            statement.setString(2, book.getTitle());
+            statement.setLong(3, book.getId());
+            statement.executeUpdate();
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot update a book by id " + book.getId(), e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sqlUpdate = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sqlUpdate)) {
+            statement.setLong(1, id);
+            int affectedRows = statement.executeUpdate();
+            return affectedRows > AT_LEAST_ONE;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cannot delete a book by id " + id, e);
+        }
+    }
+
+    private Book parseBook(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getObject("id", Long.class);
+        String model = resultSet.getString("title");
+        BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+        return new Book(id, model, 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 +1,53 @@
+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/resources/init_db.sql

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