diff --git a/pom.xml b/pom.xml
index 683e84ec..f66e25ff 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,6 +18,14 @@
+
+
+ com.mysql
+ mysql-connector-j
+ 8.3.0
+
+
+
diff --git a/src/main/java/mate/academy/ConnectionUtil.java b/src/main/java/mate/academy/ConnectionUtil.java
new file mode 100644
index 00000000..8e76ca7e
--- /dev/null
+++ b/src/main/java/mate/academy/ConnectionUtil.java
@@ -0,0 +1,25 @@
+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?serverTimezone=UTC";
+ private static final Properties DB_PROPERTIES = new Properties();
+
+ static {
+ DB_PROPERTIES.put("user", "root");
+ DB_PROPERTIES.put("password", "Root1234");
+ 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);
+ }
+}
diff --git a/src/main/java/mate/academy/Main.java b/src/main/java/mate/academy/Main.java
index 0058fbf9..6fd78b60 100644
--- a/src/main/java/mate/academy/Main.java
+++ b/src/main/java/mate/academy/Main.java
@@ -1,7 +1,46 @@
package mate.academy;
+import java.math.BigDecimal;
+import java.util.List;
+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.dao");
+
public static void main(String[] args) {
+ BookDao bookDao = (BookDao) INJECTOR.getInstance(BookDao.class);
+ final Book book1 = new Book();
+ final Book book2 = new Book();
+ final Book book3 = new Book();
+ final Book book4 = new Book();
+ // initialize field values using setters or constructor
+ book1.setTitle("QWERTY");
+ book1.setPrice(BigDecimal.valueOf(123));
+ bookDao.create(book1);
+ book2.setTitle("title");
+ book2.setPrice(BigDecimal.valueOf(456));
+ bookDao.create(book2);
+ book3.setTitle("World");
+ book3.setPrice(BigDecimal.valueOf(789));
+ bookDao.create(book3);
+ book4.setTitle("Cat");
+ book4.setPrice(BigDecimal.valueOf(543));
+ bookDao.create(book4);
+ // test other methods from BookDao
+ List bookList = bookDao.findAll();
+ bookList.forEach(System.out::println);
+
+ System.out.println();
+
+ Book updatedBook = new Book();
+ updatedBook.setId(bookList.get(0).getId());
+ updatedBook.setTitle("Updated");
+ updatedBook.setPrice(BigDecimal.valueOf(999));
+ bookDao.update(updatedBook);
+ bookList.forEach(System.out::println);
+ bookList.forEach(book -> bookDao.deleteById(book.getId()));
}
}
diff --git a/src/main/java/mate/academy/dao/BookDao.java b/src/main/java/mate/academy/dao/BookDao.java
new file mode 100644
index 00000000..77d01020
--- /dev/null
+++ b/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 findById(Long id);
+
+ List findAll();
+
+ Book update(Book book) throws DataProcessingException;
+
+ boolean deleteById(Long id);
+}
diff --git a/src/main/java/mate/academy/dao/BookDaoImpl.java b/src/main/java/mate/academy/dao/BookDaoImpl.java
new file mode 100644
index 00000000..60e44f7b
--- /dev/null
+++ b/src/main/java/mate/academy/dao/BookDaoImpl.java
@@ -0,0 +1,119 @@
+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.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)) {
+ preparedStatement.setString(1, book.getTitle());
+ preparedStatement.setBigDecimal(2, book.getPrice());
+ int affectedRows = preparedStatement.executeUpdate();
+ if (affectedRows < 1) {
+ throw new DataProcessingException("Expected at least 1 row but found 0");
+ }
+ ResultSet generatedKeys = preparedStatement.getGeneratedKeys();
+ if (generatedKeys.next()) {
+ Long id = generatedKeys.getObject(1, Long.class);
+ book.setId(id);
+ }
+ } catch (SQLException e) {
+ throw new DataProcessingException("Can not create book", e);
+ }
+ return book;
+ }
+
+ @Override
+ public Optional 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(extractBookFromResultSet(resultSet));
+ }
+ } catch (SQLException e) {
+ throw new DataProcessingException("Can not find book by id", e);
+ }
+ return Optional.empty();
+ }
+
+ @Override
+ public List findAll() {
+ String sql = "SELECT * FROM books";
+ try (Connection connection = ConnectionUtil.getConnection();
+ PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+ ResultSet resultSet = preparedStatement.executeQuery();
+ List books = new ArrayList<>();
+ while (resultSet.next()) {
+ books.add(extractBookFromResultSet(resultSet));
+ }
+ return books;
+ } catch (SQLException e) {
+ throw new DataProcessingException("Can not find book by id", e);
+ }
+ }
+
+ @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)) {
+ preparedStatement.setString(1, book.getTitle());
+ preparedStatement.setBigDecimal(2, book.getPrice());
+ preparedStatement.setLong(3, book.getId());
+ int affectedRows = preparedStatement.executeUpdate();
+ if (affectedRows < 1) {
+ throw new DataProcessingException("Expected at least 1 row but found 0");
+ }
+ } catch (SQLException e) {
+ throw new DataProcessingException("Can not update book", e);
+ }
+ return book;
+ }
+
+ @Override
+ public boolean deleteById(Long id) {
+ String sql = "DELETE FROM books WHERE id = ?";
+ try (Connection connection = ConnectionUtil.getConnection();
+ PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+ Optional book = findById(id);
+ if (book.isEmpty()) {
+ return false;
+ }
+ preparedStatement.setLong(1, book.get().getId());
+ preparedStatement.executeUpdate();
+ } catch (SQLException e) {
+ throw new DataProcessingException("Can not delete book", e);
+ }
+ return true;
+ }
+
+ private Book extractBookFromResultSet(ResultSet resultSet) throws SQLException {
+ Long id = resultSet.getObject("id", Long.class);
+ String title = resultSet.getString("title");
+ BigDecimal price = resultSet.getBigDecimal("price");
+ Book book = new Book();
+ book.setId(id);
+ book.setTitle(title);
+ book.setPrice(price);
+ return book;
+ }
+}
diff --git a/src/main/java/mate/academy/dao/DataProcessingException.java b/src/main/java/mate/academy/dao/DataProcessingException.java
new file mode 100644
index 00000000..04c278e3
--- /dev/null
+++ b/src/main/java/mate/academy/dao/DataProcessingException.java
@@ -0,0 +1,13 @@
+package mate.academy.dao;
+
+import java.sql.SQLException;
+
+public class DataProcessingException extends RuntimeException {
+ public DataProcessingException(String message, SQLException e) {
+ super(message);
+ }
+
+ public DataProcessingException(String message) {
+ super(message);
+ }
+}
diff --git a/src/main/java/mate/academy/model/Book.java b/src/main/java/mate/academy/model/Book.java
new file mode 100644
index 00000000..e2cb4289
--- /dev/null
+++ b/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 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
+ + '}';
+ }
+}
diff --git a/src/main/resources/init_db.sql b/src/main/resources/init_db.sql
new file mode 100644
index 00000000..9a370bbf
--- /dev/null
+++ b/src/main/resources/init_db.sql
@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS books (
+ id BIGINT AUTO_INCREMENT PRIMARY KEY,
+ title VARCHAR(255) NOT NULL,
+ price DECIMAL(10, 2) NOT NULL
+ );
\ No newline at end of file