Hw jv jdbc intro

pom.xml

@@ -18,6 +18,14 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.28</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -1,7 +1,33 @@
 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");
+    private static final BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+
     public static void main(String[] args) {
+        Book book = new Book("book", BigDecimal.valueOf(100));
+        Book createdBook = bookDao.create(book);
+        System.out.println(createdBook);
+
+        Optional<Book> getBookById = bookDao.findById(1L);
+        System.out.println("Book by id " + getBookById);
+
+        book.setTitle("Updated Book");
+        book.setPrice(BigDecimal.valueOf(200));
+        Book updatedBook = bookDao.update(book);
+        System.out.println("Updated Book: " + updatedBook);
+
+        List<Book> getAllBook = bookDao.findAll();
+        System.out.println("All Books : " + getAllBook);
 
+        boolean deleteBook = bookDao.deleteById(3L);
+        System.out.println("Deleted book: " + deleteBook);
     }
 }

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

@@ -0,0 +1,17 @@
+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/impl/BookDaoImpl.java

@@ -0,0 +1,115 @@
+package mate.academy.dao.impl;
+
+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.dao.BookDao;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+import mate.academy.util.db.ConnectionUtil;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    private static final String CANT_CREATE = "Can't store the book to the DB";
+    private static final String CANT_FIND_BY_ID = "Can't find the book with id = ";
+    private static final String CANT_FIND_ALL = "Can't find all books";
+    private static final String CANT_UPDATE = "Can't update the book with id = ";
+    private static final String CANT_DELETE = "Can't delete the book with id = ";
+
+    @Override
+    public Book create(Book book) {
+        String insertQuery = "INSERT INTO books (title,price) VALUES (?,?);";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(
+                        insertQuery, Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.executeUpdate();
+            ResultSet generatedKey = statement.getGeneratedKeys();
+            if (generatedKey.next()) {
+                Long id = generatedKey.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(CANT_CREATE, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String getByIdQuery = "SELECT * FROM books WHERE id = ? AND is_deleted = 0";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(getByIdQuery)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(createBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(CANT_FIND_BY_ID + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String getAllQuery = "SELECT * FROM books WHERE is_deleted = 0";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(getAllQuery)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                books.add(createBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(CANT_FIND_ALL, e);
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        String updateQuery = "UPDATE books SET title = ?, price = ? "
+                + "WHERE id = ? AND is_deleted = 0";
+        Long id = book.getId();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(updateQuery)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, id);
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows > 0) {
+                return book;
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(CANT_UPDATE + id, e);
+        }
+        throw new DataProcessingException(CANT_FIND_BY_ID + id);
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String deletedQuery = "UPDATE books SET is_deleted = 1 WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(deletedQuery)) {
+            statement.setLong(1, id);
+            return statement.executeUpdate() != 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException(CANT_DELETE + id, e);
+        }
+    }
+
+    private Book createBook(ResultSet resultSet) throws SQLException {
+        return new Book(
+                resultSet.getLong("id"),
+                resultSet.getString("title"),
+                resultSet.getBigDecimal("price"));
+    }
+}

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) {
+        super(message);
+    }
+
+    public DataProcessingException(String message, Throwable exception) {
+        super(message, exception);
+    }
+}

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() {
+    }
+
+    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/java/mate/academy/util/db/ConnectionUtil.java

@@ -0,0 +1,26 @@
+package mate.academy.util.db;
+
+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/mate";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "12345678");
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can not load JDBC driver", 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 AUTO_INCREMENT PRIMARY KEY,
+    title VARCHAR(255) NOT NULL,
+    price DECIMAL(6, 2) NOT NULL,
+    is_deleted TINYINT NOT NULL DEFAULT 0
+)ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;