Solved task 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>8.0.33</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -1,7 +1,31 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.List;
+import mate.academy.dao.BookDao;
+import mate.academy.entity.Book;
+import mate.academy.lib.Injector;
+
 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("Heroes Land", new BigDecimal(15));
+        Book savedBook = bookDao.create(book);
+        System.out.println(savedBook);
+
+        List<Book> bookList = bookDao.findAll();
+        bookList.forEach(System.out::println);
+
+        Book bookFromDB = bookDao.findById(1L).get();
+        System.out.println(bookFromDB);
+
+        bookFromDB.setPrice(new BigDecimal(25));
+        Book updatedBook = bookDao.update(bookFromDB);
+        System.out.println(updatedBook);
 
+        boolean isDeleted = bookDao.deleteById(1L);
+        System.out.println(isDeleted);
     }
 }

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.entity.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 +1,105 @@
+package mate.academy.dao.impl;
+
+import static mate.academy.util.Constants.GET_ALL_BOOKS_QUERY;
+import static mate.academy.util.Constants.GET_BOOK_BY_ID_QUERY;
+import static mate.academy.util.Constants.SAVE_BOOK_QUERY;
+import static mate.academy.util.Constants.UPDATE_BOOK_QUERY;
+
+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.entity.Book;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.util.ConnectionUtil;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+
+    @Override
+    public Book create(Book book) {
+        try (PreparedStatement createBookStatement = ConnectionUtil.getConnection()
+                .prepareStatement(SAVE_BOOK_QUERY, Statement.RETURN_GENERATED_KEYS)) {
+            createBookStatement.setString(1, book.getTitle());
+            createBookStatement.setBigDecimal(2, book.getPrice());
+            createBookStatement.executeUpdate();
+            ResultSet generatedKeys = createBookStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                book.setId(generatedKeys.getObject(1, Long.class));
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can`t add book " + book + " to DB", e);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        try (PreparedStatement getBookByIdStatement =
+                     ConnectionUtil.getConnection().prepareStatement(GET_BOOK_BY_ID_QUERY)) {
+            getBookByIdStatement.setLong(1, id);
+            ResultSet resultSet = getBookByIdStatement.executeQuery();
+            Book book = null;
+            if (resultSet.next()) {
+                book = parseBookFromResultSet(resultSet);
+            }
+            return Optional.ofNullable(book);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get book by id: " + id + " from DB", e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        try (PreparedStatement getAllBooksStatement =
+                     ConnectionUtil.getConnection().prepareStatement(GET_ALL_BOOKS_QUERY)) {
+            ResultSet resultSet = getAllBooksStatement.executeQuery();
+            while (resultSet.next()) {
+                books.add(parseBookFromResultSet(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get books from DB", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        try (PreparedStatement upadateBookStatment =
+                     ConnectionUtil.getConnection().prepareStatement(
+                             UPDATE_BOOK_QUERY, Statement.RETURN_GENERATED_KEYS)) {
+            upadateBookStatment.setString(1, book.getTitle());
+            upadateBookStatment.setBigDecimal(2, book.getPrice());
+            upadateBookStatment.setLong(3, book.getId());
+            upadateBookStatment.executeUpdate();
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book: " + book + " in DB", e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        try (PreparedStatement statement = ConnectionUtil.getConnection().prepareStatement(
+                             "DELETE FROM books WHERE id=?", Statement.RETURN_GENERATED_KEYS)) {
+            statement.setLong(1, id);
+            return statement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by id: " + id + " from DB", e);
+        }
+    }
+
+    private Book parseBookFromResultSet(ResultSet resultSet) throws SQLException {
+        return new Book(
+                resultSet.getLong("id"),
+                resultSet.getString("title"),
+                resultSet.getBigDecimal("price")
+        );
+    }
+}

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

@@ -0,0 +1,49 @@
+package mate.academy.entity;
+
+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 String.format("Book: {id: %d title - %s, price - %s}", id, title, price);
+    }
+}

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

@@ -0,0 +1,8 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+
+    public DataProcessingException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/mate/academy/exception/DbException.java

@@ -0,0 +1,8 @@
+package mate.academy.exception;
+
+public class DbException extends RuntimeException {
+
+    public DbException(String message) {
+        super(message);
+    }
+}

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

@@ -0,0 +1,33 @@
+package mate.academy.util;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+import mate.academy.exception.DbException;
+
+public class ConnectionUtil {
+    private static final Properties dbProperties = new Properties();
+
+    static {
+        try {
+            dbProperties.load(new FileInputStream(Constants.APP_PROPERTIES_FILE));
+            Class.forName(dbProperties.getProperty(Constants.DB_DRIVER_TAG));
+        } catch (IOException e) {
+            throw new DbException("Can`t load JDBC driver for MYSQL: " + e.getMessage());
+        } catch (ClassNotFoundException e) {
+            throw new DbException("Can`t load driver properties: " + e.getMessage());
+        }
+    }
+
+    public static Connection getConnection() {
+        try {
+            return DriverManager.getConnection(
+                    dbProperties.getProperty(Constants.DB_URL_TAG));
+        } catch (SQLException e) {
+            throw new DbException("Can`t create connection for DB: " + e.getMessage());
+        }
+    }
+}

src/main/java/mate/academy/util/Constants.java

@@ -0,0 +1,15 @@
+package mate.academy.util;
+
+public class Constants {
+    // Application paths
+    public static final String APP_PROPERTIES_FILE = "src/main/resources/app.properties";
+    // DB connection constants
+    public static final String DB_DRIVER_TAG = "db.driver";
+    public static final String DB_URL_TAG = "db.connection.url";
+    // Book dao sql query
+    public static final String SAVE_BOOK_QUERY = "INSERT INTO books(title, price) VALUES(?, ?)";
+    public static final String GET_BOOK_BY_ID_QUERY = "SELECT * FROM books WHERE id = ?";
+    public static final String GET_ALL_BOOKS_QUERY = "SELECT * FROM books";
+    public static final String UPDATE_BOOK_QUERY =
+            "UPDATE books SET title = ?, price = ? WHERE id = ?";
+}

src/main/resources/app.properties

@@ -0,0 +1,2 @@
+db.driver=com.mysql.cj.jdbc.Driver
+db.connection.url=jdbc:mysql://localhost:3306/testdb?user=root&password=root

src/main/resources/init_db.sql

@@ -0,0 +1,8 @@
+CREATE SCHEMA IF NOT EXISTS testdb DEFAULT CHARACTER SET utf8;
+USE testdb;
+
+CREATE TABLE IF NOT EXISTS books (
+  id bigint AUTO_INCREMENT PRIMARY KEY,
+  title varchar(45) NOT NULL,
+  price decimal DEFAULT 0,
+);