completed homework jdbc-intro

pom.xml

@@ -18,6 +18,16 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>9.1.0</version>
+        </dependency>
+
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -1,7 +1,28 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.Arrays;
+import java.util.List;
+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.dao");
 
+    public static void main(String[] args) {
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+        List<Book> books = Arrays.asList(
+                new Book(1L, "Book1", BigDecimal.valueOf(5.99)),
+                new Book(2L, "Book2", BigDecimal.valueOf(4.35)),
+                new Book(3L, "Book3", BigDecimal.valueOf(10.00))
+        );
+        books.forEach(bookDao::create);
+        Book secondBook = books.get(1);
+        secondBook.setTitle("Book4");
+        bookDao.update(secondBook);
+        System.out.println(bookDao.findById(2L));
+        System.out.println(bookDao.findAll());
+        bookDao.deleteById(3L);
     }
 }

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

@@ -0,0 +1,18 @@
+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 +1,112 @@
+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 {
+    private static final String CREATE = "INSERT INTO books (title, price) VALUES (?, ?)";
+    private static final String FIND_BY_ID = "SELECT * FROM books WHERE id = ?";
+    private static final String FIND_ALL = "SELECT * FROM books";
+    private static final String UPDATE = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+    private static final String DELETE_BY_ID = "DELETE FROM books WHERE id = ?";
+
+    @Override
+    public Book create(Book book) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement
+                        = connection.prepareStatement(CREATE, Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.executeUpdate();
+
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                book.setId(generatedKeys.getLong(1));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't create book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(long id) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(FIND_BY_ID)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(takeBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find book by id: " + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(FIND_ALL)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                books.add(takeBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find all books", e);
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(UPDATE)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            if (statement.executeUpdate() < 1) {
+                throw new DataProcessingException("Book with id "
+                        + book.getId() + " does not found for update");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(long id) {
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(DELETE_BY_ID)) {
+            statement.setLong(1, id);
+            return statement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by id: " + id, e);
+        }
+    }
+
+    private Book takeBook(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 +1,11 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable ex) {
+        super(message, ex);
+    }
+
+    public DataProcessingException(String message) {
+        super(message);
+    }
+}

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

@@ -0,0 +1,53 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+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 String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='"
+                + title + '\''
+                + ", price=" + price
+                + '}';
+    }
+}

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

@@ -0,0 +1,27 @@
+package mate.academy.util;
+
+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/jdbc_intro";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "root");
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Cannot load the JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,5 @@
+CREATE TABLE books (
+                       id BIGINT AUTO_INCREMENT PRIMARY KEY,
+                       title VARCHAR(255) NOT NULL,
+                       price DECIMAL(10, 2) NOT NULL
+);