first commit

pom.xml

@@ -18,6 +18,14 @@
         </maven.checkstyle.plugin.configLocation>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>9.0.0</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>

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

@@ -0,0 +1,27 @@
+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";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "v1f9v7f7");
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Could not load MySQL driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

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

@@ -1,7 +1,24 @@
 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 {
+    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();
+        book.setTitle("Java Programming");
+        book.setPrice(new BigDecimal("99.99"));
 
+        System.out.println(bookDao.create(book));
+        System.out.println(bookDao.findById(4L));
+        System.out.println(bookDao.findAll());
+        System.out.println(bookDao.update(book));
+        System.out.println(bookDao.deleteById(4L));
     }
 }

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 +1,126 @@
+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.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+
+    @Override
+    public Book create(Book book) {
+        String query = "INSERT INTO book (title, price) VALUES (?, ?);";
+
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(
+                        query, Statement.RETURN_GENERATED_KEYS)) {
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            int affectRows = preparedStatement.executeUpdate();
+            if (affectRows == 0) {
+                throw new DataProcessingException(
+                        "Expected to add at least one row but added 0",
+                        new SQLException());
+            }
+            ResultSet generatedKeys = preparedStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to create book " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String query = "SELECT * FROM book WHERE id = ?;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(query)) {
+            preparedStatement.setLong(1, id);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(creatingBook(resultSet, id));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to find book by id: " + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String query = "SELECT * FROM book;";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(query)) {
+            ResultSet resultSet = preparedStatement.executeQuery();
+            while (resultSet.next()) {
+                Long id = resultSet.getObject("id", Long.class);
+                books.add(creatingBook(resultSet, id));
+                return books;
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to find books", e);
+        }
+        return new ArrayList<>();
+    }
+
+    @Override
+    public Book update(Book book) {
+        String query = "UPDATE book SET title = ?, price = ? WHERE id = ?;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(
+                        query, Statement.RETURN_GENERATED_KEYS)) {
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            preparedStatement.setLong(3, book.getId());
+            int affectRows = preparedStatement.executeUpdate();
+            if (affectRows == 0) {
+                throw new DataProcessingException(
+                        "Expected to update at least one row but updated 0",
+                        new SQLException());
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Failed to update book " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String query = "DELETE FROM book WHERE id = ?;";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement preparedStatement = connection.prepareStatement(query)) {
+            preparedStatement.setLong(1, id);
+            return preparedStatement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete an object with id: " + id, e);
+        }
+    }
+
+    private Book creatingBook(ResultSet resultSet, Long id) {
+        try {
+            String title = resultSet.getString("title");
+            BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+            Book book = new Book();
+            book.setId(id);
+            book.setTitle(title);
+            book.setPrice(price);
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't create a book with id = " + id, e);
+        }
+    }
+}

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

@@ -0,0 +1,6 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable ex) {
+    }
+}

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 BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price=" + price
+                + '}';
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,6 @@
+USE test;
+CREATE TABLE book (
+                       id BIGINT AUTO_INCREMENT PRIMARY KEY,
+                       title VARCHAR(255),
+                       price DECIMAL(10, 2)
+);