jdbc-intro-v1

pom.xml

@@ -8,6 +8,14 @@
     <artifactId>jv-jdbc-intro</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+    </dependencies>
+
     <properties>
         <jdk.version>17</jdk.version>
         <maven.compiler.source>17</maven.compiler.source>
@@ -39,6 +47,15 @@
                     <linkXRef>false</linkXRef>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>22</source>
+                    <target>22</target>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                </configuration>
+            </plugin>
         </plugins>
         <pluginManagement>
             <plugins>

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

@@ -1,7 +1,32 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.Optional;
+import mate.academy.dao.BookDao;
+import mate.academy.dao.BookDaoImpl;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
+private static final Injector injector = Injector.getInstance("mate.academy");
 public class Main {
     public static void main(String[] args) {
+        BookDaoImpl bookDao = (BookDaoImpl) injector.getInstance(BookDao.class);
+
+        Book book = new Book();
+        book.setId(1L);
+        book.setTitle("Frodo and stuff");
+        book.setPrice(new BigDecimal(100));
+        bookDao.create(book);
+
+        Optional<Book> foundBook = bookDao.findById(book.getId());
+        foundBook.ifPresent(System.out::println);
 
+        book.setTitle("Eldery stuff");
+        bookDao.update(book);
+
+        bookDao.deleteById(1L);
+
+        bookDao.findAll().forEach(System.out::println);
     }
 }
+

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

@@ -0,0 +1,19 @@
+package mate.academy.dao;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public interface BookDao {
+    Book create(Book book);
+
+    List<Book> findAll();
+
+    Optional<Book> findById(Long id);
+
+    Book update(Book book);
+
+    boolean deleteById(Long id);
+}

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

@@ -0,0 +1,119 @@
+package mate.academy.dao;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+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.lib.Dao;
+import mate.academy.model.Book;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    public static final String URL = "jdbc:mysql://localhost:3306/book";
+    public static final String USER = "root";
+    public static final String PASSWORD = "1111";
+
+    @Override
+    public Book create(Book book) {
+        String query = "INSERT INTO books (title, price) VALUES (?, ?)";
+        try (Connection connection = DriverManager.getConnection(URL, USER, PASSWORD)) {
+            PreparedStatement preparedStatement =
+                    connection.prepareStatement(query, PreparedStatement.RETURN_GENERATED_KEYS);
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            int updatedRows = preparedStatement.executeUpdate();
+            if (updatedRows == 0) {
+                throw new RuntimeException("Creating book failed, no rows affected.");
+            }
+            ResultSet generatedKeys = preparedStatement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                book.setId(generatedKeys.getLong(1));
+            }
+        } catch (RuntimeException e) {
+            throw new RuntimeException("Runtime exception while creating book."
+                    + " Can't create book", e);
+        } catch (SQLException e) {
+            throw new RuntimeException("SQL error while creating book."
+                    + " Can't create book", e);
+        }
+        return book;
+    }
+
+    @Override
+    public List<Book> findAll() {
+        List<Book> books = new ArrayList<>();
+        String query = "SELECT * FROM books";
+        try (Connection connection = DriverManager.getConnection(URL, USER, PASSWORD)) {
+            Statement statement = connection.createStatement();
+            ResultSet resultSet = statement.executeQuery(query);
+            while (resultSet.next()) {
+                books.add(mapBookFromResultSet(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException("SQL error while creating book. Can't find book", e);
+        }
+        return books;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String query = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = DriverManager.getConnection(URL, USER, PASSWORD)) {
+            PreparedStatement preparedStatement = connection.prepareStatement(query);
+            preparedStatement.setLong(1, id);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if (resultSet.next()) {
+                return Optional.of(mapBookFromResultSet(resultSet));
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find a book by id: " + id, e);;
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public Book update(Book book) {
+        String query = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = DriverManager.getConnection(URL, USER, PASSWORD)) {
+            PreparedStatement preparedStatement = connection.prepareStatement(query);
+            preparedStatement.setString(1, book.getTitle());
+            preparedStatement.setBigDecimal(2, book.getPrice());
+            preparedStatement.setLong(3, book.getId());
+            if (preparedStatement.executeUpdate() > 0) {
+                return book;
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException("Sql error while updating book",e);
+        }
+        throw new RuntimeException("Book not found");
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String query = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = DriverManager.getConnection(URL, USER, PASSWORD)) {
+            PreparedStatement preparedStatement = connection.prepareStatement(query);
+            preparedStatement.setLong(1, id);
+            return preparedStatement.executeUpdate() > 0;
+        } catch (SQLException e) {
+            throw new RuntimeException("Sql error while deleting book",e);
+        }
+    }
+
+    private Book mapBookFromResultSet(ResultSet resultSet) {
+        try {
+            Book book = new Book();
+            book.setId(resultSet.getLong("id"));
+            book.setTitle(resultSet.getString("title"));
+            book.setPrice(resultSet.getBigDecimal("price"));
+            return book;
+        } catch (SQLException e) {
+            throw new RuntimeException("SQL error while mapping - can't return book.", e);
+        }
+    }
+}

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

@@ -0,0 +1,38 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+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 String toString() {
+        return "Book [id=" + id + ", title=" + title + ", price=" + price + "]";
+    }
+}

src/main/resources/inint_db.sql

@@ -0,0 +1,6 @@
+CREATE TABLE books (
+    id BIGINT NOT NULL AUTO_INCREMENT,
+    title VARCHAR(255) NOT NULL,
+    price DECIMAL(10, 2) NOT NULL,
+    PRIMARY KEY (id)
+);