developed dao logic

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>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>9.1.0</version>
+        </dependency>
+    </dependencies>
 
     <build>
         <plugins>

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

@@ -1,7 +1,23 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import mate.academy.book.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.lib");
+    private static final BookDao dao = (BookDao) injector.getInstance(BookDao.class);
+    private static final BigDecimal BIG_DECIMAL = new BigDecimal(8855);
+    private static final Book BOOK_TO_CREATE = new Book("title", BIG_DECIMAL);
+    private static final Book BOOK_TO_UPDATE = new Book(2L,"name", BIG_DECIMAL);
 
+    public static void main(String[] args) {
+        dao.create(BOOK_TO_CREATE);
+        dao.deleteById(3L);
+        dao.update(BOOK_TO_UPDATE);
+        dao.findById(1L);
+        dao.findAll();
     }
 }

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

@@ -0,0 +1,17 @@
+package mate.academy.book;
+
+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/book/BookDaoImpl.java

@@ -0,0 +1,121 @@
+package mate.academy.book;
+
+import java.math.BigDecimal;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import mate.academy.connection.ConnectionUtils;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+
+    @Override
+    public Book create(Book book) {
+        int titlePlace = 1;
+        int pricePlace = 2;
+        String sqlInsertionStatement = "INSERT INTO book (title, price) VALUES (?, ?)";
+        try (Connection connection = ConnectionUtils.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sqlInsertionStatement,
+                        PreparedStatement.RETURN_GENERATED_KEYS)) {
+            statement.setString(titlePlace, book.getTitle());
+            statement.setBigDecimal(pricePlace, book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows > 0) {
+                try (ResultSet generatedKeys = statement.getGeneratedKeys()) {
+                    if (generatedKeys.next()) {
+                        book.setId(generatedKeys.getLong(1));
+                    }
+                }
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Unable to insert book: " + book.toString(), e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        int variablePlace = 1;
+        String sqlGetStatement = "SELECT * FROM book WHERE id = ?";
+        try (Connection connection = ConnectionUtils.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sqlGetStatement)) {
+            statement.setLong(variablePlace,id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                Long idFromDB = resultSet.getObject("id", Long.class);
+                String title = resultSet.getString("title");
+                BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+                Book book = new Book(idFromDB,title,price);
+                return Optional.of(book);
+            }
+            return Optional.empty();
+        } catch (SQLException e) {
+            throw new DataProcessingException("Cant get book with id:" + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sqlFindAllStatement = "SELECT * FROM book";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtils.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sqlFindAllStatement);
+                ResultSet resultSet = statement.executeQuery()) {
+
+            while (resultSet.next()) {
+                Long id = resultSet.getObject("id", Long.class);
+                String title = resultSet.getString("title");
+                BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+
+                Book book = new Book(id, title, price);
+                books.add(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't read data", e);
+        }
+        return books;
+    }
+
+    @Override
+    public Book update(Book book) {
+        int idPlace = 3;
+        int titlePlace = 1;
+        int pricePlace = 2;
+        String sqlUpdateStatement = "UPDATE book SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtils.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sqlUpdateStatement)) {
+            statement.setLong(idPlace,book.getId());
+            statement.setString(titlePlace,book.getTitle());
+            statement.setBigDecimal(pricePlace,book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows > 0) {
+                return book;
+            } else {
+                throw new RuntimeException("Failed to update book with id: " + book.getId());
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update " + book.toString(), e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        int idPlace = 1;
+        String sqlDeleteStatement = "DELETE FROM book WHERE id = ? ";
+        try (Connection connection = ConnectionUtils.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sqlDeleteStatement)) {
+            statement.setLong(idPlace,id);
+            int affectedRows = statement.executeUpdate();
+            return affectedRows > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book with id: " + id, e);
+        }
+    }
+}

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

@@ -0,0 +1,30 @@
+package mate.academy.connection;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+import mate.academy.exception.DataProcessingException;
+
+public class ConnectionUtils {
+    private static final String DB_URL = "jdbc:mysql://localhost:3306/test";
+    private static final Properties DB_PROPERTIES;
+    private static final String PASSWORD = "4321";
+    private static final String USER = "root";
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", USER);
+        DB_PROPERTIES.put("password", PASSWORD);
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new DataProcessingException("Can't load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL,DB_PROPERTIES);
+    }
+}

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 ex) {
+        super(message, ex);
+    }
+}

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

@@ -0,0 +1,72 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+import java.util.Objects;
+
+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;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Book book = (Book) o;
+        return id == book.id && Objects
+                .equals(title, book.title) && Objects.equals(price, book.price);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, title, 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 + System.lineSeparator()
+                + ", price=" + price
+                + '}';
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,2 @@
+select *
+from book