Hw jb intro

pom.xml

@@ -14,4 +14,14 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</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;
+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 book = new Book();
+        book.setTitle("On the Road");
+        book.setPrice(new BigDecimal("19"));
+        bookDao.create(book);
+        Optional<Book> bookGet = bookDao.findById(2L);
+        List<Book> books = bookDao.findAll();
+        Book newBook = new Book();
+        newBook.setTitle("The partner");
+        newBook.setPrice(new BigDecimal("39"));
+        bookDao.update(book);
+        System.out.println(book);
+        bookDao.deleteById(2L);
     }
 }

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

@@ -0,0 +1,14 @@
+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 +1,116 @@
+package mate.academy.dao;
+
+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.*;
+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 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 RuntimeException("Expected to insert at leas one row, but inserted 0 rows");
+            }
+            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 add new book" + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM books WHERE id = ? AND is_deleted = FALSE";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                Book book = parse(resultSet);
+                return Optional.of(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find book by id", e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> list = new ArrayList<>();
+        String sql = "SELECT * FROM books WHERE is_deleted = FALSE";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql)) {
+            ResultSet resultSet = statement.executeQuery(sql);
+            while (resultSet.next()) {
+                Book book = parse(resultSet);
+                list.add(book);
+            }
+            return list;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find all books in db", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sql = "UPDATE books SET title = ?, price = ? WHERE id = ? AND is_deleted = FALSE";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            statement.executeUpdate();
+
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't updated book" + book, e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "UPDATE books SET is_deleted = TRUE WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            int updatedRows = statement.executeUpdate();
+            return updatedRows > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book", e);
+        }
+    }
+
+    private Book parse(ResultSet resultSet) {
+        try {
+            Long id = resultSet.getObject("id", Long.class);
+            String title = resultSet.getString("title");
+            BigDecimal price = resultSet.getBigDecimal("price");
+            Book book = new Book();
+            book.setTitle(title);
+            book.setPrice(price);
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get data from resultSet", e);
+        }
+    }
+}

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 cause) {
+        super(message, cause);
+    }
+}

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

@@ -0,0 +1,42 @@
+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 +1,28 @@
+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/library_db";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "root");
+
+        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 +1,8 @@
+CREATE SCHEMA `library_db` DEFAULT CHARACTER SET utf8 ;
+
+CREATE TABLE `books` (
+  `id` BIGINT(10) NOT NULL AUTO_INCREMENT,
+  `title` VARCHAR(45) NOT NULL,
+  `price` DECIMAL NOT NULL,
+  `is_deleted` tinyint NOT NULL DEFAULT '0',
+  PRIMARY KEY (`id`));