Jbdc

pom.xml

@@ -17,6 +17,13 @@
             https://raw.githubusercontent.com/mate-academy/style-guides/master/java/checkstyle.xml
         </maven.checkstyle.plugin.configLocation>
     </properties>
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+    </dependencies>
 
     <build>
         <plugins>

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

@@ -1,7 +1,29 @@
 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 Injector injector = Injector.getInstance("mate.academy");
 
+    public static void main(String[] args) {
+        Book harryPotter = new Book();
+        harryPotter.setTitle("Harry Potter");
+        harryPotter.setPrice(BigDecimal.valueOf(25));
+        Book lordOfTheRings = new Book();
+        lordOfTheRings.setTitle("Lord of the Rings");
+        lordOfTheRings.setPrice(BigDecimal.valueOf(15));
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+        Book harryPotterBook = bookDao.create(harryPotter);
+        Book lotrBook = bookDao.create(lordOfTheRings);
+        System.out.println(harryPotterBook);
+        System.out.println(lotrBook);
+        bookDao.findAll().forEach(System.out::println);
+        harryPotter.setPrice(BigDecimal.valueOf(50));
+        bookDao.update(harryPotter);
+        bookDao.deleteById(1L);
+        bookDao.findById(2L).ifPresent(System.out::println);
     }
 }

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 +1,114 @@
+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.Dao;
+import mate.academy.model.Book;
+import mate.academy.util.ConnectionUtil;
+
+@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.setString(2, book.getPrice().toString());
+            preparedStatement.executeUpdate();
+            ResultSet resultSet = preparedStatement.getGeneratedKeys();
+            if (resultSet.next()) {
+                Long id = resultSet.getObject(1, Long.class);
+                book.setId(id);
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not create book" + book, e);
+        }
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM books WHERE id = ?;";
+        Book book;
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement
+                        = connection.prepareStatement(sql)) {
+            preparedStatement.setLong(1, id);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if (resultSet.next()) {
+                book = getBook(resultSet);
+                return Optional.of(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can ot find book by id" + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sql = "SELECT * FROM books;";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                 PreparedStatement preparedStatement
+                         = connection.prepareStatement(sql)) {
+            ResultSet resultSet = preparedStatement.executeQuery();
+            while (resultSet.next()) {
+                books.add(getBook(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not find books from db", 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.setString(2, book.getPrice().toString());
+            preparedStatement.setLong(3, book.getId());
+            preparedStatement.executeUpdate();
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not update book from db" + book, e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM books WHERE id = ?;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement
+                        = connection.prepareStatement(sql)) {
+            preparedStatement.setLong(1, id);
+            return preparedStatement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can not delete by id from db" + id, e);
+        }
+    }
+
+    private Book getBook(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/exception/DataProcessingException.java

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

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/java/mate/academy/util/ConnectionUtil.java

@@ -0,0 +1,32 @@
+package mate.academy.util;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtil {
+    public static final String SQL_DRIVER = "com.mysql.cj.jdbc.Driver";
+    public static final String DB_URL = "jdbc:mysql://localhost:3306/books_db";
+    public static final String USER = "root";
+    public static final String PASSWORD = "!Vladius080197";
+
+    static {
+        try {
+            Class.forName(SQL_DRIVER);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can not load JDBC driver.", e);
+        }
+    }
+
+    public static Connection getConnection() {
+        try {
+            Properties properties = new Properties();
+            properties.setProperty("user", USER);
+            properties.setProperty("password", PASSWORD);
+            return DriverManager.getConnection(DB_URL, properties);
+        } catch (SQLException e) {
+            throw new RuntimeException("Can not create connection to database", e);
+        }
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,7 @@
+CREATE DATABASE 'books_db';
+
+CREATE TABLE 'books' (
+    'id' BIGINT PRIMARY KEY AUTO_INCREMENT,
+    'title' VARCHAR(255) NOT NULL,
+    'price' DECIMAL NOT NULL
+    );