done. check it

pom.xml

@@ -9,9 +9,51 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
+        <jdk.version>17</jdk.version>
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.checkstyle.plugin.configLocation>
+            https://raw.githubusercontent.com/mate-academy/style-guides/master/java/checkstyle.xml
+        </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.1.1</version>
+                <executions>
+                    <execution>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <configLocation>${maven.checkstyle.plugin.configLocation}</configLocation>
+                    <encoding>UTF-8</encoding>
+                    <consoleOutput>true</consoleOutput>
+                    <failsOnError>true</failsOnError>
+                    <linkXRef>false</linkXRef>
+                </configuration>
+            </plugin>
+        </plugins>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.8.0</version>
+                    <configuration>
+                        <source>${jdk.version}</source>
+                        <target>${jdk.version}</target>
+                        <encoding>${project.build.sourceEncoding}</encoding>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
 </project>

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

@@ -1,7 +1,28 @@
 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 {
-    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 book = new Book();
+        book.setPrice(BigDecimal.valueOf(10));
+        book.setTitle("Testing");
+        Book savedBook = bookDao.create(book);
+        List<Book> all = bookDao.findAll();
+        Optional<Book> bookOptional = bookDao.findById(savedBook.getId());
+        System.out.println(bookOptional.get().getTitle());
+        Book toUpdateBook = new Book();
+        toUpdateBook.setPrice(BigDecimal.valueOf(15));
+        toUpdateBook.setTitle("Testing2");
+        bookDao.update(book);
+        bookDao.deleteById(savedBook.getId());
     }
 }

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 +1,127 @@
+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.exception.DataProcessingException;
+import mate.academy.lib.ConnectionUtil;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    private static final int ID_INDEX = 1;
+    private static final int TITLE_INDEX = 1;
+    private static final int PRICE_INDEX = 2;
+    private static final int MINIMAL_OPERATION_AMOUNT = 1;
+
+    @Override
+    public Book create(Book book) {
+        String insertQuery = "INSERT INTO book(title, price)"
+                + " values(?,?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement creationStatement = connection.prepareStatement(insertQuery,
+                        Statement.RETURN_GENERATED_KEYS)) {
+            creationStatement.setString(TITLE_INDEX, book.getTitle());
+            creationStatement.setBigDecimal(PRICE_INDEX, book.getPrice());
+            creationStatement.executeUpdate();
+            ResultSet generatedKeys = creationStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(ID_INDEX, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("can't get connection to db", e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String selectRequest = "SELECT * FROM book WHERE id = ? AND is_deleted = FALSE";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement selectStatement =
+                        connection.prepareStatement(selectRequest)) {
+            selectStatement.setLong(ID_INDEX, id);
+            selectStatement.executeQuery();
+            ResultSet generatedKeys = selectStatement.executeQuery();
+            return Optional.of(parseResultSet(generatedKeys));
+        } catch (SQLException e) {
+            throw new DataProcessingException("can't get book from DB " + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> allBooks = new ArrayList<>();
+        String selectRequest = "SELECT * FROM Book WHERE is_deleted = FALSE";
+        try (Connection connection = ConnectionUtil.getConnection(); Statement getAllStatement =
+                connection.createStatement()) {
+            ResultSet resultSet = getAllStatement.executeQuery(selectRequest);
+            while (resultSet.next()) {
+                allBooks.add(parseResultSet(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("can't get all books from DB ", e);
+        }
+        return allBooks;
+    }
+
+    @Override
+    public Book update(Book book) {
+        String updateRequest = "UPDATE Book SET title = ?, price = ?"
+                + " WHERE id = ? AND is_deleted = FALSE";
+        int idPosition = 3;
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement updateStatement =
+                        connection.prepareStatement(updateRequest, Statement
+                             .RETURN_GENERATED_KEYS)) {
+            updateStatement.setLong(idPosition, book.getId());
+            updateStatement.setString(TITLE_INDEX, book.getTitle());
+            updateStatement.setBigDecimal(PRICE_INDEX, book.getPrice());
+            updateStatement.executeUpdate();
+        } catch (SQLException e) {
+            throw new DataProcessingException("can't update book: "
+                    + book + " in DB ", e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String deleteRequest = "UPDATE Book SET is_deleted = TRUE WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement deleteStatement =
+                        connection.prepareStatement(deleteRequest,
+                             Statement.RETURN_GENERATED_KEYS)) {
+            deleteStatement.setLong(ID_INDEX, id);
+            return deleteStatement.executeUpdate() >= MINIMAL_OPERATION_AMOUNT;
+        } catch (SQLException e) {
+            throw new DataProcessingException("can't delete book from DB with id: "
+                    + id, e);
+        }
+    }
+
+    private static Book parseResultSet(ResultSet set) {
+        Book book = new Book();
+        try {
+            if (set.next()) {
+                Long id = set.getLong("id");
+                String title = set.getString("title");
+                BigDecimal price = set.getBigDecimal("price");
+                book.setId(id);
+                book.setTitle(title);
+                book.setPrice(price);
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get book from set " + set, 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/lib/ConnectionUtil.java

@@ -0,0 +1,29 @@
+package mate.academy.lib;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+import mate.academy.exception.DataProcessingException;
+
+public class ConnectionUtil {
+    static {
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new DataProcessingException("can't create a jdbc driver ", e);
+        }
+    }
+
+    public static Connection getConnection() {
+        try {
+            Properties dbProperties = new Properties();
+            dbProperties.put("user", "root");
+            dbProperties.put("password", "12345678");
+            return DriverManager
+                    .getConnection("jdbc:mysql://localhost:3306/test", dbProperties);
+        } catch (SQLException e) {
+            throw new DataProcessingException("can't create connection to DB ", e);
+        }
+    }
+}

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

@@ -0,0 +1,33 @@
+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;
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,7 @@
+CREATE TABLE `Book` (
+    `id` int NOT NULL AUTO_INCREMENT,
+    `title` varchar(45) NOT NULL,
+    `price` DECIMAL DEFAULT NULL,
+    `is_deleted` tinyint NOT NULL DEFAULT '0',
+    PRIMARY KEY (`id`)
+);