added jv-jdbc-intro solution

pom.xml

@@ -14,4 +14,11 @@
         <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 +1,32 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.models.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 book1 = new Book(1L, "Math", BigDecimal.valueOf(100));
+        Book book2 = new Book(2L, "Java", BigDecimal.valueOf(150));
+        List<Book> books = new ArrayList<>();
+        books.add(book1);
+        books.add(book2);
+//        for (Book book : books) {
+//            bookDao.create(book);
+//        } // success
+        System.out.println(bookDao.findAll());
+        System.out.println(bookDao.findById(1L));
+        book1.setTitle("English");
+        book1.setPrice(BigDecimal.valueOf(70));
+        bookDao.update(book1);
+        bookDao.deleteById(1L);
+        System.out.println(bookDao.findById(1L));
     }
 }

src/main/java/mate/academy/connection/ConnectionUtil.java

@@ -0,0 +1,29 @@
+package mate.academy.connection;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtil {
+    private static final String URL =
+            "jdbc:mysql://localhost:3306/books_db";
+    private static final String USERNAME = "root";
+    private static final String PASSWORD = "12345678";
+    private static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
+
+    static {
+        try {
+            Class.forName(JDBC_DRIVER);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't find SQL Driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        Properties dbProperties = new Properties();
+        dbProperties.setProperty("user", USERNAME);
+        dbProperties.setProperty("password", PASSWORD);
+        return DriverManager.getConnection(URL, dbProperties);
+    }
+}

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.models.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 +1,120 @@
+package mate.academy.dao.impl;
+
+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.connection.ConnectionUtil;
+import mate.academy.dao.BookDao;
+import mate.academy.exceptions.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.models.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    @Override
+    public Book create(Book book) {
+       String query = "INSERT INTO books (title, price) "
+               + "VALUES (?, ?);";
+       try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement =
+                        connection.prepareStatement(query, Statement.RETURN_GENERATED_KEYS)) {
+           statement.setString(1, book.getTitle());
+           statement.setBigDecimal(2, book.getPrice());
+           statement.executeUpdate();
+           ResultSet resultSet = statement.getGeneratedKeys();
+           if (resultSet.next()) {
+               book.setId(resultSet.getObject(1, Long.class));
+           }
+           return book;
+       } catch (SQLException e) {
+           throw new DataProcessingException(
+                   "Can't insert a book into DB: " + book, e
+           );
+       }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String query = "SELECT * FROM books "
+                + "WHERE id = ? AND is_deleted = FALSE;";
+        Book book = null;
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setLong(1, id);
+            statement.executeQuery();
+            ResultSet resultSet = statement.getResultSet();
+            if (resultSet.next()) {
+                book = getBookFromResultSet(resultSet);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(
+                    "Can't get a book from DB by id: " + id, e
+            );
+        }
+        return Optional.ofNullable(book);
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String query = "SELECT * FROM books WHERE is_deleted = FALSE;";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.executeQuery();
+            ResultSet resultSet = statement.getResultSet();
+            while (resultSet.next()) {
+                books.add(getBookFromResultSet(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException(
+                    "Can't get all books from DB.", e
+            );
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        String query = "UPDATE books SET title = ?, price = ? "
+                + "WHERE is_deleted = FALSE AND id = ?;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            statement.executeUpdate();
+        } catch (SQLException e) {
+            throw new DataProcessingException(
+                    "Can't update a book in DB.", e
+            );
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String query = "UPDATE books SET is_deleted = TRUE WHERE id = ?;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setLong(1, id);
+            return statement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException(
+                    "Can't delete a book from DB by id: " + id, e
+            );
+        }
+    }
+
+    private Book getBookFromResultSet(ResultSet resultSet) throws SQLException {
+        Long bookId = resultSet.getObject("id", Long.class);
+        String bookTitle = resultSet.getString("title");
+        BigDecimal bookPrice = resultSet.getBigDecimal("price");
+        return new Book(bookId, bookTitle, bookPrice);
+    }
+}

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

@@ -0,0 +1,15 @@
+package mate.academy.exceptions;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException() {
+
+    }
+
+    public DataProcessingException(String message) {
+        super(message);
+    }
+
+    public DataProcessingException(String message, Throwable ex) {
+        super(message, ex);
+    }
+}

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

@@ -0,0 +1,74 @@
+package mate.academy.models;
+
+import java.math.BigDecimal;
+import java.util.Objects;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Book() {
+    }
+
+    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 boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Book that = (Book) o;
+        return Objects.equals(id, that.id)
+                && Objects.equals(title, that.title)
+                && Objects.equals(price, that.price);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = id != null ? id.hashCode() : 0;
+        result = 31 * result + (title != null ? title.hashCode() : 0);
+        result = 31 * result + (price != null ? price.hashCode() : 0);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price=" + price
+                + '}';
+    }
+}

src/main/resources/inti_db.sql

@@ -0,0 +1,8 @@
+CREATE DATABASE `books_db` /*!40100 DEFAULT CHARACTER SET utf8mb3 */ /*!80016 DEFAULT ENCRYPTION='N' */;
+
+CREATE TABLE `books_db`.`books` (
+                                    `id` BIGINT NOT NULL AUTO_INCREMENT,
+                                    `title` VARCHAR(255) NOT NULL,
+                                    `price` DECIMAL NOT NULL DEFAULT 0,
+                                    `is_deleted` TINYINT NOT NULL DEFAULT 0,
+                                    PRIMARY KEY (`id`));