jv-jdbc-intro

pom.xml

@@ -17,7 +17,14 @@
             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>
             <plugin>
@@ -54,5 +61,6 @@
                 </plugin>
             </plugins>
         </pluginManagement>
+
     </build>
 </project>

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

@@ -1,7 +1,45 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+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");
+
+        public static void main(String[] args) {
+            BookDao bookDao = (BookDao) INJECTOR.getInstance(BookDao.class);
+            Optional<Book> foundBook = bookDao.findById(1L);
+            if (foundBook.isPresent()) {
+                System.out.println("Book found: " + foundBook.get());
+                Book bookToUpdate = foundBook.get();
+                bookToUpdate.setTitle("Alice in Wonderland");
+                bookToUpdate.setPrice(new BigDecimal("120.00"));
+                bookDao.update(bookToUpdate);
+                System.out.println("Book updated: " + bookToUpdate);
+            } else {
+                System.out.println("Book not found. Creating a new book.");
+                Book book = new Book();
+                book.setPrice(new BigDecimal("100.00"));
+                book.setTitle("Alice");
+                bookDao.create(book);
+                System.out.println("Book created: " + book);
+            }
+
+            List<Book> allBooks = bookDao.findAll();
+            System.out.println("All books in the database:");
+            for (Book b : allBooks) {
+                System.out.println(b);
+            }
 
+            boolean isDeleted = bookDao.deleteById(1L);
+            if (isDeleted) {
+                System.out.println("Book with ID 1 deleted.");
+            } else {
+                System.out.println("Book with ID 1 not found.");
+            }
+        }
     }
-}

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

@@ -0,0 +1,20 @@
+package mate.academy.dao;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.model.Book;
+
+@Dao
+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/lib/Dao.java → src/main/java/mate/academy/dao/Dao.java

@@ -1,4 +1,4 @@
-package mate.academy.lib;
+package mate.academy.dao;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;

src/main/java/mate/academy/dao/impl/BookDaoImpl.java

@@ -0,0 +1,128 @@
+package mate.academy.dao.impl;
+
+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.dao.BookDao;
+import mate.academy.dao.Dao;
+import mate.academy.exceptions.DataProcessingException;
+import mate.academy.lib.ConnectionUtil;
+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 statement = connection.prepareStatement(
+                        sql, Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            if (statement.executeUpdate() < 1) {
+                throw new RuntimeException("Expected to insert 1 record but inserted 0 rows");
+            }
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't create book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM books WHERE id = ?";
+        if (id == null) {
+            return Optional.empty();
+        }
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                String title = resultSet.getObject("title", String.class);
+                BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+
+                Book book = new Book();
+                book.setId(id);
+                book.setPrice(price);
+                book.setTitle(title);
+                return Optional.of(book);
+            }
+            return Optional.empty();
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't get book by id" + id, e);
+        }
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sql = "SELECT * FROM books";
+        List<Book> books = new ArrayList<>();
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            ResultSet resultSet = statement.executeQuery();
+            while (resultSet.next()) {
+                Long id = resultSet.getObject("id", Long.class);
+                String title = resultSet.getObject("title", String.class);
+                BigDecimal price = resultSet.getObject("price", BigDecimal.class);
+
+                Book book = new Book();
+                book.setId(id);
+                book.setPrice(price);
+                book.setTitle(title);
+                books.add(book);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find 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 statement = connection.prepareStatement(sql,
+                        Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            if (statement.executeUpdate() < 1) {
+                throw new RuntimeException("Expected to insert 1 record but inserted 0 rows");
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update book " + book, e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        if (id == null) {
+            return false;
+        }
+        String sql = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+                PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setLong(1, id);
+            if (statement.executeUpdate() < 1) {
+                return false;
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by id " + id, e);
+        }
+        return true;
+    }
+}

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

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

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

@@ -0,0 +1,29 @@
+package mate.academy.lib;
+
+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 String USER = "root";
+    private static final String PASSWORD = "qwerty123";
+    private static final Properties DB_PROPERTIES;
+
+    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 RuntimeException("Can not load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL);
+    }
+}

src/main/java/mate/academy/lib/Injector.java

@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import mate.academy.dao.Dao;
 
 public class Injector {
     private static final Map<String, Injector> injectors = new HashMap<>();

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

@@ -0,0 +1,62 @@
+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 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 boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Book book = (Book) o;
+        return Objects.equals(id, book.id)
+                && Objects.equals(title, book.title)
+                && Objects.equals(price, book.price);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, title, price);
+    }
+
+    @Override
+    public String toString() {
+        return "Book{"
+                + "id=" + id
+                + ", title='" + title + '\''
+                + ", price=" + price
+                + '}';
+    }
+}

src/main/resources/init_db.sql

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