Implemented jv-jdbc-intro

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 +1,25 @@
+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/test?serverTimezone=UTC";
+    private static final Properties DB_PROPERTIES = new Properties();
+
+    static {
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "Root1234");
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

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

@@ -1,7 +1,46 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.List;
+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.dao");
+
     public static void main(String[] args) {
+        BookDao bookDao = (BookDao) INJECTOR.getInstance(BookDao.class);
+        final Book book1 = new Book();
+        final Book book2 = new Book();
+        final Book book3 = new Book();
+        final Book book4 = new Book();
+        // initialize field values using setters or constructor
+        book1.setTitle("QWERTY");
+        book1.setPrice(BigDecimal.valueOf(123));
+        bookDao.create(book1);
+        book2.setTitle("title");
+        book2.setPrice(BigDecimal.valueOf(456));
+        bookDao.create(book2);
+        book3.setTitle("World");
+        book3.setPrice(BigDecimal.valueOf(789));
+        bookDao.create(book3);
+        book4.setTitle("Cat");
+        book4.setPrice(BigDecimal.valueOf(543));
+        bookDao.create(book4);
+        // test other methods from BookDao
+        List<Book> bookList = bookDao.findAll();
+        bookList.forEach(System.out::println);
+
+        System.out.println();
+
+        Book updatedBook = new Book();
+        updatedBook.setId(bookList.get(0).getId());
+        updatedBook.setTitle("Updated");
+        updatedBook.setPrice(BigDecimal.valueOf(999));
+        bookDao.update(updatedBook);
+        bookList.forEach(System.out::println);
 
+        bookList.forEach(book -> bookDao.deleteById(book.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) throws DataProcessingException;
+
+    boolean deleteById(Long id);
+}

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

@@ -0,0 +1,119 @@
+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.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+
+    @Override
+    public Book create(Book book) {
+        String sql = "INSERT INTO books (title, price) VALUES (?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(sql,
+                        Statement.RETURN_GENERATED_KEYS)) {
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            int affectedRows = preparedStatement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new DataProcessingException("Expected at least 1 row but found 0");
+            }
+            ResultSet generatedKeys = preparedStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not create book", e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+            preparedStatement.setLong(1, id);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(extractBookFromResultSet(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not find book by id", e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sql = "SELECT * FROM books";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+            ResultSet resultSet = preparedStatement.executeQuery();
+            List<Book> books = new ArrayList<>();
+            while (resultSet.next()) {
+                books.add(extractBookFromResultSet(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not find book by id", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sql = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            preparedStatement.setLong(3, book.getId());
+            int affectedRows = preparedStatement.executeUpdate();
+            if (affectedRows < 1) {
+                throw new DataProcessingException("Expected at least 1 row but found 0");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not update book", e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+            Optional<Book> book = findById(id);
+            if (book.isEmpty()) {
+                return false;
+            }
+            preparedStatement.setLong(1, book.get().getId());
+            preparedStatement.executeUpdate();
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not delete book", e);
+        }
+        return true;
+    }
+
+    private Book extractBookFromResultSet(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getObject("id", Long.class);
+        String title = resultSet.getString("title");
+        BigDecimal price = resultSet.getBigDecimal("price");
+        Book book = new Book();
+        book.setId(id);
+        book.setTitle(title);
+        book.setPrice(price);
+        return book;
+    }
+}

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

@@ -0,0 +1,13 @@
+package mate.academy.dao;
+
+import java.sql.SQLException;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, SQLException e) {
+        super(message);
+    }
+
+    public DataProcessingException(String message) {
+        super(message);
+    }
+}

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

@@ -0,0 +1,42 @@
+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;
+    }
+
+    @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) NOT NULL
+    );