HM JDBC

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>8.3.0</version>
+        </dependency>
+    </dependencies>
 
     <build>
         <plugins>

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

@@ -1,7 +1,38 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+import mate.academy.bookdao.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 firstBook = Book.of("Effective Java", new BigDecimal(700));
+        Book secondBook = Book.of("Clean Code", new BigDecimal(900));
+        Book thirdBook = Book.of("Head of Java", new BigDecimal(600));
+
+        bookDao.create(firstBook);
+        bookDao.create(secondBook);
+        bookDao.create(thirdBook);
+
+        List<Book> booksFromDb = bookDao.findAll();
+        System.out.println(booksFromDb);
+
+        Optional<Book> bookById = bookDao.findById(3L);
+        bookById.ifPresent(System.out::println);
+
+        Book book = Book.of(3L, "Harry Potter", new BigDecimal(1000));
+        Book updated = bookDao.update(book);
+        System.out.println(updated);
+
+        bookDao.findById(3L).ifPresent(System.out::println);
 
+        boolean isBookDeleted = bookDao.deleteById(3L);
+        System.out.println(isBookDeleted);
     }
 }

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

@@ -0,0 +1,18 @@
+package mate.academy.bookdao;
+
+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/bookdao/BookDaoImpl.java

@@ -0,0 +1,122 @@
+package mate.academy.bookdao;
+
+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.dbconnection.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 sql = "INSERT INTO books(title, price) VALUES(?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+                        PreparedStatement preparedStatement = connection
+                                .prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+            if (storeBook(preparedStatement, book, false)) {
+                throw new RuntimeException("Book could not be created");
+            }
+            ResultSet generatedKeys = preparedStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't add a book " + 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(mapToBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get 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();
+                            Statement statement = connection.createStatement();
+                            ResultSet resultSet = statement.executeQuery(sql)) {
+            while (resultSet.next()) {
+                books.add(mapToBook(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get all books", e);
+        }
+        return books;
+    }
+
+    @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)) {
+            if (storeBook(preparedStatement, book, true)) {
+                throw new RuntimeException("Book not found");
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book " + book.getTitle(), e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                        PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            int affectedRow = statement.executeUpdate();
+            if (affectedRow < 1) {
+                throw new RuntimeException("Book not found by id " + id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by " + id, e);
+        }
+        return true;
+    }
+
+    private Book mapToBook(ResultSet resultSet) throws SQLException {
+        Long id = resultSet.getLong("id");
+        String title = resultSet.getString("title");
+        BigDecimal price = resultSet.getBigDecimal("price");
+        return Book.of(id, title, price);
+    }
+
+    private boolean storeBook(PreparedStatement preparedStatement,
+                              Book book, boolean idPresent) throws SQLException {
+        if (idPresent) {
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            preparedStatement.setLong(3, book.getId());
+            return preparedStatement.executeUpdate() < 1;
+        }
+        preparedStatement.setString(1, book.getTitle());
+        preparedStatement.setBigDecimal(2, book.getPrice());
+        return preparedStatement.executeUpdate() < 1;
+    }
+}

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

@@ -0,0 +1,27 @@
+package mate.academy.dbconnection;
+
+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", "databasepractice1!");
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load a 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 cause) {
+        super(message, cause);
+    }
+}

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

@@ -0,0 +1,65 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    private Book(Long id, String title, BigDecimal price) {
+        this.id = id;
+        this.title = title;
+        this.price = price;
+    }
+
+    private Book(String title, BigDecimal price) {
+        this.title = title;
+        this.price = price;
+    }
+
+    public static Book of(Long id, String title, BigDecimal price) {
+        return new Book(id, title, price);
+    }
+
+    public static Book of(String title, BigDecimal price) {
+        return new Book(title, price);
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id="
+                + id
+                + ", title='"
+                + title
+                + '\''
+                + ", price="
+                + price
+                + '}';
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,6 @@
+CREATE TABLE books
+(
+    id BIGINT PRIMARY KEY AUTO_INCREMENT,
+    title VARCHAR(100) NOT NULL,
+    price DECIMAL NOT NULL
+);