Create bookDaoImpl

pom.xml

@@ -14,4 +14,12 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+    </dependencies>
+
 </project>

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/books";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "S13o28N24m23$");
+
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load JDBC driver" , e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

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

@@ -1,7 +1,26 @@
 package mate.academy;
 
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+
 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();
+        List<Book> all = bookDao.findAll();
+        book.setId(2L);
+        book.setTitle("MERS");
+        book.setPrice(BigDecimal.valueOf(245.32));
+        bookDao.update(book);
+        all.forEach(System.out::println);
+        bookDao.deleteById(2L);
+        all = bookDao.findAll();
+        all.forEach(System.out::println);
     }
 }

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

@@ -0,0 +1,14 @@
+package mate.academy.dao;
+
+import mate.academy.model.Book;
+
+import java.util.List;
+import java.util.Optional;
+
+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 +1,158 @@
+package mate.academy.dao;
+
+import mate.academy.ConnectionUtil;
+import mate.academy.exception.DataProcessingException;
+import mate.academy.model.Book;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.sql.Connection;
+import java.sql.DatabaseMetaData;
+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;
+
+@mate.academy.lib.Dao
+public class BookDaoImpl implements BookDao {
+    private static final String TABLE_NAME = "books";
+    private static final String TITLE_NAME = "title";
+    private static final String PRICE_NAME = "price";
+    private static final int FIRST_INDEX = 1;
+    private static final int SECOND_INDEX = 2;
+    private static final int THIRD_INDEX = 3;
+    private static final int ROW_EXIST_NUM = 1;
+
+    @Override
+    public Book create(Book book) {
+        String sql = "INSERT INTO " + TABLE_NAME + " (title, price) VALUES (?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+            validateTableConnection(connection, TABLE_NAME);
+            statement.setString(FIRST_INDEX, book.getTitle());
+            statement.setBigDecimal(SECOND_INDEX, book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < ROW_EXIST_NUM) {
+                throw new DataProcessingException("Expected to insert at leas one row, but inserted 0 row.");
+            }
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if (generatedKeys.next()) {
+                Long id = generatedKeys.getObject(FIRST_INDEX, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't add new book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String sql = "SELECT * FROM " + TABLE_NAME + " WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql)) {
+            validateTableConnection(connection, TABLE_NAME);
+            statement.setLong(FIRST_INDEX, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                String title = resultSet.getString(TITLE_NAME);
+                BigDecimal price = resultSet.getObject(PRICE_NAME, BigDecimal.class);
+                Book book = new Book();
+                book.setId(id);
+                book.setTitle(title);
+                book.setPrice(price);
+                return Optional.of(book);
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException("Can't create a connection to the DB" ,e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String sql = "SELECT * FROM " + TABLE_NAME;
+        try (Connection connection = ConnectionUtil.getConnection();
+             Statement statement = connection.createStatement()) {
+            ResultSet resultSet = statement.executeQuery(sql);
+            List<Book> allBooks = new ArrayList<>();
+            while (resultSet.next()) {
+                Long id = resultSet.getObject(FIRST_INDEX, Long.class);
+                String title = resultSet.getString(TITLE_NAME);
+                BigDecimal price = resultSet.getObject(PRICE_NAME, BigDecimal.class);
+                Book book = new Book();
+                book.setId(id);
+                book.setTitle(title);
+                book.setPrice(price);
+                allBooks.add(book);
+            }
+            return allBooks;
+        } catch (SQLException e) {
+            throw new RuntimeException("Can't create a connection to the DB" ,e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String sql = "UPDATE " + TABLE_NAME + " SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql)) {
+            validateTableConnection(connection, TABLE_NAME);
+            statement.setString(FIRST_INDEX, book.getTitle());
+            statement.setBigDecimal(SECOND_INDEX, book.getPrice());
+            statement.setLong(THIRD_INDEX, book.getId());
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < ROW_EXIST_NUM) {
+                throw new DataProcessingException("Expected to insert at leas one row, but inserted 0 row.");
+            }
+            return book;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update new book: " + book, e);
+        }
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String sql = "DELETE FROM " + TABLE_NAME + " WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql)) {
+            validateTableConnection(connection, TABLE_NAME);
+            statement.setLong(FIRST_INDEX, id);
+            int affectedRows = statement.executeUpdate();
+            if (affectedRows < ROW_EXIST_NUM) {
+                throw new DataProcessingException("Expected to insert at leas one row, but inserted 0 row.");
+            }
+            return affectedRows >= 1;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by id: " + id, e);
+        }
+    }
+
+    private static boolean tableExists(Connection connection ,String tableName) throws SQLException {
+        DatabaseMetaData metaData = connection.getMetaData();
+        try (var resultSet = metaData.getTables(null, null, tableName, null)) {
+            return resultSet.next();
+        }
+    }
+
+    private void validateTableConnection(Connection connection, String tableName) throws SQLException {
+        if (connection == null) {
+            throw new DataProcessingException("Connection can't be null");
+        }
+        if (tableName == null) {
+            throw new DataProcessingException("TableName can't be null");
+        }
+        if (tableName.isEmpty()) {
+            throw new DataProcessingException("TableName can't be empty");
+        }
+        if (!tableExists(connection, tableName)) {
+            throw new DataProcessingException("Table: " + tableName + " is not exist");
+        }
+    }
+}

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

@@ -0,0 +1,11 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message) {
+        super(message);
+    }
+
+    public DataProcessingException(String message, Throwable ex) {
+        super(message, ex);
+    }
+}

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

@@ -0,0 +1,44 @@
+package mate.academy.model;
+
+import mate.academy.lib.Dao;
+
+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/init_db.sql

@@ -0,0 +1,5 @@
+CREATE TABLE books (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    title VARCHAR(50) NOT NULL,
+    price DECIMAL(10, 2) NOT NULL
+);