From 3c0d70445099ffa3bc63af4a71fff1b7c0e1d937 Mon Sep 17 00:00:00 2001 From: Evhenii Polishuchenko Date: Thu, 3 Aug 2023 20:14:27 +0300 Subject: [PATCH] initial commit --- pom.xml | 8 +- src/main/java/mate/academy/Main.java | 22 +++- src/main/java/mate/academy/dao/BookDao.java | 17 +++ .../mate/academy/dao/impl/BookDaoImpl.java | 115 ++++++++++++++++++ .../exception/DataProcessingException.java | 7 ++ src/main/java/mate/academy/model/Book.java | 45 +++++++ .../mate/academy/util/ConnectionUtil.java | 26 ++++ src/main/resources/init_db.sql | 6 + 8 files changed, 244 insertions(+), 2 deletions(-) create mode 100644 src/main/java/mate/academy/dao/BookDao.java create mode 100644 src/main/java/mate/academy/dao/impl/BookDaoImpl.java create mode 100644 src/main/java/mate/academy/exception/DataProcessingException.java create mode 100644 src/main/java/mate/academy/model/Book.java create mode 100644 src/main/java/mate/academy/util/ConnectionUtil.java create mode 100644 src/main/resources/init_db.sql diff --git a/pom.xml b/pom.xml index 969b5f3e..ca7cabe8 100644 --- a/pom.xml +++ b/pom.xml @@ -13,5 +13,11 @@ 17 UTF-8 - + + + mysql + mysql-connector-java + 8.0.33 + + \ No newline at end of file diff --git a/src/main/java/mate/academy/Main.java b/src/main/java/mate/academy/Main.java index 0058fbf9..865e9ee7 100644 --- a/src/main/java/mate/academy/Main.java +++ b/src/main/java/mate/academy/Main.java @@ -1,7 +1,27 @@ package mate.academy; +import mate.academy.dao.BookDao; +import mate.academy.lib.Injector; +import mate.academy.model.Book; +import java.math.BigDecimal; + 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 = new Book(); + firstBook.setTitle("firstBook"); + firstBook.setPrice(BigDecimal.valueOf(10)); + Book secondBook = new Book(); + secondBook.setTitle("secondBook"); + secondBook.setPrice(BigDecimal.valueOf(20)); + bookDao.create(firstBook); + bookDao.create(secondBook); + System.out.println(bookDao.findById(firstBook.getId())); + bookDao.findAll().forEach(System.out::println); + firstBook.setPrice(BigDecimal.valueOf(30)); + firstBook.setTitle("newFirstBook"); + bookDao.update(firstBook); + System.out.println(bookDao.deleteById(secondBook.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..5219aa0b --- /dev/null +++ b/src/main/java/mate/academy/dao/BookDao.java @@ -0,0 +1,17 @@ +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 findById(Long id); + + List findAll(); + + Book update(Book book); + + boolean deleteById(Long id); +} diff --git a/src/main/java/mate/academy/dao/impl/BookDaoImpl.java b/src/main/java/mate/academy/dao/impl/BookDaoImpl.java new file mode 100644 index 00000000..8a0e5024 --- /dev/null +++ b/src/main/java/mate/academy/dao/impl/BookDaoImpl.java @@ -0,0 +1,115 @@ +package mate.academy.dao.impl; + +import mate.academy.dao.BookDao; +import mate.academy.exception.DataProcessingException; +import mate.academy.lib.Dao; +import mate.academy.model.Book; +import mate.academy.util.ConnectionUtil; +import java.math.BigDecimal; +import java.sql.Connection; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.util.ArrayList; +import java.util.List; +import java.util.Optional; + +@Dao +public class BookDaoImpl implements BookDao { + @Override + public Book create(Book book) { + String request = "INSERT INTO books (title, price) VALUES(?, ?)"; + try (Connection connection = ConnectionUtil.getConnection(); + PreparedStatement statement = connection.prepareStatement( + request, PreparedStatement.RETURN_GENERATED_KEYS + )) { + statement.setString(1, book.getTitle()); + statement.setObject(2, book.getPrice()); + int affectedRows = statement.executeUpdate(); + if (affectedRows < 1) { + throw new RuntimeException( + "Expected to insert at leas one row, but inserted 0 rows."); + } + ResultSet resultSet = statement.getGeneratedKeys(); + if (resultSet.next()) { + Long id = resultSet.getObject(1, Long.class); + book.setId(id); + } + } catch (SQLException e) { + throw new DataProcessingException("Can't save a book " + book, e); + } + return book; + } + + @Override + public Optional findById(Long id) { + String request = "SELECT * FROM books WHERE id = ?"; + try (Connection connection = ConnectionUtil.getConnection(); + PreparedStatement statement = connection.prepareStatement(request)) { + statement.setLong(1, id); + ResultSet resultSet = statement.executeQuery(); + if (resultSet.next()) { + return Optional.of(initializedBook(resultSet)); + } + } catch (SQLException e) { + throw new DataProcessingException("Can't find book by id= " + id, e); + } + return Optional.empty(); + } + + @Override + public List findAll() { + String request = "SELECT * FROM books"; + List books = new ArrayList<>(); + try (Connection connection = ConnectionUtil.getConnection(); + PreparedStatement statement = connection.prepareStatement(request)) { + ResultSet resultSet = statement.executeQuery(); + while (resultSet.next()) { + books.add(initializedBook(resultSet)); + } + return books; + } catch (SQLException e) { + throw new DataProcessingException("Can't find all books from DB", e); + } + } + + @Override + public Book update(Book book) { + String request = "UPDATE books SET title = ?, price = ? WHERE id = ?"; + try (Connection connection = ConnectionUtil.getConnection(); + PreparedStatement statement = connection.prepareStatement(request)) { + statement.setString(1, book.getTitle()); + statement.setObject(2, book.getPrice()); + statement.setObject(3, book.getId()); + if (statement.executeUpdate() < 1) { + throw new RuntimeException( + "Expected to insert at least one row, but inserted 0 rows"); + } + } catch (SQLException e) { + throw new DataProcessingException("Can't update book " + book, e); + } + return book; + } + + @Override + public boolean deleteById(Long id) { + String request = "DELETE FROM books WHERE id = ?"; + try (Connection connection = ConnectionUtil.getConnection(); + PreparedStatement statement = connection.prepareStatement(request)) { + statement.setObject(1, id); + return statement.executeUpdate() > 0; + } catch (SQLException e) { + throw new DataProcessingException("Can't delete book by id= " + id, e); + } + } + private Book initializedBook(ResultSet resultSet) throws SQLException { + Long id = resultSet.getObject("id", Long.class); + String title = resultSet.getString("title"); + BigDecimal price = BigDecimal.valueOf(resultSet.getLong("price")); + Book book = new Book(); + book.setId(id); + book.setTitle(title); + book.setPrice(price); + return book; + } +} diff --git a/src/main/java/mate/academy/exception/DataProcessingException.java b/src/main/java/mate/academy/exception/DataProcessingException.java new file mode 100644 index 00000000..de9b45dc --- /dev/null +++ b/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 ex) { + super(message, ex); + } +} 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..63cc2747 --- /dev/null +++ b/src/main/java/mate/academy/model/Book.java @@ -0,0 +1,45 @@ +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/java/mate/academy/util/ConnectionUtil.java b/src/main/java/mate/academy/util/ConnectionUtil.java new file mode 100644 index 00000000..d1e69ff0 --- /dev/null +++ b/src/main/java/mate/academy/util/ConnectionUtil.java @@ -0,0 +1,26 @@ +package mate.academy.util; + +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", "qwerty123"); + try { + Class.forName("com.mysql.cj.jdbc.Driver"); + } catch (ClassNotFoundException e) { + throw new RuntimeException("Can't load JDBC driver for MySQL", e); + } + } + + public static Connection getConnection() throws SQLException { + return DriverManager.getConnection(DB_URL, DB_PROPERTIES); + } +} diff --git a/src/main/resources/init_db.sql b/src/main/resources/init_db.sql new file mode 100644 index 00000000..52b51b26 --- /dev/null +++ b/src/main/resources/init_db.sql @@ -0,0 +1,6 @@ +CREATE TABLE `books` ( + `id` BIGINT NOT NULL AUTO_INCREMENT, + `title` VARCHAR(255), + `price` INT, + PRIMARY KEY (`id`) + ); \ No newline at end of file