do HW

pom.xml

@@ -18,6 +18,14 @@
         </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/ConnectionUtil.java

@@ -0,0 +1,32 @@
+package mate.academy;
+
+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/hw";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "new_password");
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can not load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() {
+        try {
+            return DriverManager
+                    .getConnection(DB_URL, DB_PROPERTIES);
+        } catch (SQLException e) {
+            throw new RuntimeException("Can not create a connection with DB", e);
+        }
+    }
+}

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

@@ -0,0 +1,7 @@
+package mate.academy;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String errorMessage, Throwable ex) {
+        super(errorMessage, ex);
+    }
+}

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

@@ -1,7 +1,18 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
 public class Main {
-    public static void main(String[] args) {
+    private static final Injector injector = Injector.getInstance("mate.academy");
 
+    public static void main(String[] args) {
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+        Book book1 = new Book(7L,"Mermaid", new BigDecimal(100));
+        book1.setPrice(BigDecimal.valueOf(150));
+        bookDao.update(book1);
+        System.out.println(bookDao.findAll());
     }
 }

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/BookDaoImpl.java

@@ -0,0 +1,150 @@
+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.ConnectionUtil;
+import mate.academy.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    private static Connection connection;
+    private static final String INSERT_QUERY = "INSERT INTO books (title, price) VALUES (?, ?)";
+    private static final String SELECT_BY_ID_QUERY = "SELECT * FROM books WHERE id = ?";
+    private static final String SELECT_ALL_QUERY = "SELECT * FROM books";
+    private static final String UPDATE_QUERY = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+    private static final String DELETE_QUERY = "DELETE FROM books WHERE id = ?";
+
+    public BookDaoImpl() {
+        connection = ConnectionUtil.getConnection();
+    }
+
+    @Override
+    public Book create(Book book) {
+        checkBook(book);
+        if (book.getId() != null) {
+            throw new RuntimeException("Book id must be null");
+        }
+        try (PreparedStatement statement = connection.prepareStatement(
+                INSERT_QUERY, Statement.RETURN_GENERATED_KEYS
+        )) {
+            statementSet(statement, book);
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new RuntimeException(
+                        "Expected to insert at least one row, but inserted 0 rows."
+                );
+            }
+            try (ResultSet generatedKeys = statement.getGeneratedKeys()) {
+                if (generatedKeys.next()) {
+                    book.setId(generatedKeys.getLong(1));
+                }
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't add new book", e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        checkId(id);
+        try (PreparedStatement statement = connection.prepareStatement(SELECT_BY_ID_QUERY)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(resultBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find book with id:" + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        try (PreparedStatement statement = connection.prepareStatement(SELECT_ALL_QUERY)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                books.add(resultBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find books", e);
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        checkBook(book);
+        checkId(book.getId());
+        try (PreparedStatement statement = connection.prepareStatement(UPDATE_QUERY)) {
+            statementSet(statement, book);
+            statement.setLong(3, book.getId());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows == 0) {
+                throw new RuntimeException("Book with id " + book.getId() + " not found.");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        checkId(id);
+        try (PreparedStatement statement = connection.prepareStatement(DELETE_QUERY)) {
+            statement.setLong(1, id);
+            int affectedRows = statement.executeUpdate();
+            return affectedRows > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book with id: " + id, e);
+        }
+    }
+
+    private void checkId(Long id) {
+        if (id <= 0) {
+            throw new RuntimeException("ID can't be zero or negative");
+        }
+    }
+
+    private void checkBook(Book book) {
+        if (book == null) {
+            throw new IllegalArgumentException("Book cannot be null");
+        }
+        if (book.getTitle() == null) {
+            throw new IllegalArgumentException("Title is null");
+        }
+    }
+
+    private Book resultBook(ResultSet resultSet) {
+        try {
+            return new Book(
+                    resultSet.getObject("id", Long.class),
+                    resultSet.getString("title"),
+                    resultSet.getObject("price", BigDecimal.class)
+                    );
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get the book", e);
+        }
+    }
+
+    private void statementSet(PreparedStatement statement, Book book) {
+        try {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't to set statement", e);
+        }
+    }
+}

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(Long id, String title, BigDecimal price) {
+        this.id = id;
+        this.title = title;
+        this.price = price;
+    }
+
+    public Book(String title, BigDecimal price) {
+        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 +1,5 @@
+CREATE TABLE IF NOT EXISTS books(
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    title VARCHAR(255) NOT NULL,
+    price DECIMAL(10, 2) NULL
+)