initial commit

pom.xml

@@ -13,5 +13,11 @@
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
-
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+    </dependencies>
 </project>

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

@@ -1,7 +1,27 @@
 package mate.academy;
 
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+import java.math.BigDecimal;
+
 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 firstBook = new Book();
+        firstBook.setTitle("firstBook");
+        firstBook.setPrice(BigDecimal.valueOf(10));
+        Book secondBook = new Book();
+        secondBook.setTitle("secondBook");
+        secondBook.setPrice(BigDecimal.valueOf(20));
+        bookDao.create(firstBook);
+        bookDao.create(secondBook);
+        System.out.println(bookDao.findById(firstBook.getId()));
+        bookDao.findAll().forEach(System.out::println);
+        firstBook.setPrice(BigDecimal.valueOf(30));
+        firstBook.setTitle("newFirstBook");
+        bookDao.update(firstBook);
+        System.out.println(bookDao.deleteById(secondBook.getId()));
     }
 }

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/impl/BookDaoImpl.java

@@ -0,0 +1,115 @@
+package mate.academy.dao.impl;
+
+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 java.math.BigDecimal;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    @Override
+    public Book create(Book book) {
+        String request = "INSERT INTO books (title, price) VALUES(?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(
+                     request, PreparedStatement.RETURN_GENERATED_KEYS
+             )) {
+            statement.setString(1, book.getTitle());
+            statement.setObject(2, book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new RuntimeException(
+                        "Expected to insert at leas one row, but inserted 0 rows.");
+            }
+            ResultSet resultSet = statement.getGeneratedKeys();
+            if (resultSet.next()) {
+                Long id = resultSet.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't save a book " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String request = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(request)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(initializedBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find book by id= " + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String request = "SELECT * FROM books";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(request)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                books.add(initializedBook(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find all books from DB", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String request = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(request)) {
+            statement.setString(1, book.getTitle());
+            statement.setObject(2, book.getPrice());
+            statement.setObject(3, book.getId());
+            if (statement.executeUpdate() < 1) {
+                throw new RuntimeException(
+                        "Expected to insert at least one row, but inserted 0 rows");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String request = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(request)) {
+            statement.setObject(1, id);
+            return statement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by id= " + id, e);
+        }
+    }
+    private Book initializedBook(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getObject("id", Long.class);
+        String title = resultSet.getString("title");
+        BigDecimal price = BigDecimal.valueOf(resultSet.getLong("price"));
+        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 +1,7 @@
+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 +1,45 @@
+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/java/mate/academy/util/ConnectionUtil.java

@@ -0,0 +1,26 @@
+package mate.academy.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/books";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "qwerty123");
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load JDBC driver for MySQL", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

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`)
+    );