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Entity Book, dao layer and its implementation were created and tested…
… in presentation layer
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package mate.academy; | ||
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import mate.academy.dao.BookDao; | ||
import mate.academy.lib.Injector; | ||
import mate.academy.model.Book; | ||
import java.math.BigDecimal; | ||
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public class Main { | ||
public static final Injector injector = Injector.getInstance("mate.academy"); | ||
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public static void main(String[] args) { | ||
BookDao bookDao = (BookDao) injector.getInstance(BookDao.class); | ||
Book mist = new Book(); | ||
mist.setTitle("Mist"); | ||
mist.setPrice(BigDecimal.valueOf(100)); | ||
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bookDao.create(mist); | ||
mist.setTitle("Mist by S.King"); | ||
mist.setPrice(BigDecimal.valueOf(101)); | ||
bookDao.update(mist); | ||
System.out.println(bookDao.findById(mist.getId())); | ||
bookDao.findAll().forEach(System.out::println); | ||
System.out.println("delete successful: " + bookDao.deleteById(mist.getId())); | ||
} | ||
} |
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package mate.academy.dao; | ||
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import mate.academy.model.Book; | ||
import java.util.List; | ||
import java.util.Optional; | ||
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public interface BookDao { | ||
Book create(Book book); | ||
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Optional<Book> findById(Long id); | ||
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List<Book> findAll(); | ||
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Book update(Book book); | ||
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boolean deleteById(Long id); | ||
} |
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package mate.academy.dao.impl; | ||
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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.sql.Statement; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
import java.util.Optional; | ||
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@Dao | ||
public class BookDaoImpl implements BookDao { | ||
@Override | ||
public Book create(Book book) { | ||
String insertBookQuery = "INSERT INTO books(title, price) values(?, ?);"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement createBookStatement = | ||
connection.prepareStatement( | ||
insertBookQuery, Statement.RETURN_GENERATED_KEYS)) { | ||
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createBookStatement.setString(1, book.getTitle()); | ||
createBookStatement.setObject( | ||
2, book.getPrice()); | ||
createBookStatement.executeUpdate(); | ||
ResultSet generatedKeys = createBookStatement.getGeneratedKeys(); | ||
if (generatedKeys.next()) { | ||
Long id = generatedKeys.getObject(1, Long.class); | ||
book.setId(id); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t insert book to DB" + book, e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public Optional<Book> findById(Long id) { | ||
String findByIdQuery = "SELECT * FROM books " | ||
+ "WHERE is_deleted = 'FALSE' AND id = ?;"; | ||
Book book = null; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement findByIdStatement = | ||
connection.prepareStatement(findByIdQuery)) { | ||
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findByIdStatement.setLong(1, id); | ||
ResultSet resultSet = findByIdStatement.executeQuery(); | ||
while (resultSet.next()) { | ||
if (resultSet.getObject("id", Long.class).equals(id)) { | ||
book = getBookFromResultSet(resultSet); | ||
} | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException( | ||
"Can`t find book by id from DB. id = " + id, e); | ||
} | ||
return Optional.ofNullable(book); | ||
} | ||
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@Override | ||
public List<Book> findAll() { | ||
String getAllQuery = "SELECT * FROM books " | ||
+ "WHERE is_deleted = 'FALSE';"; | ||
List<Book> books = new ArrayList<>(); | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement findAllBooksStatement = | ||
connection.prepareStatement(getAllQuery)) { | ||
ResultSet resultSet = findAllBooksStatement.executeQuery(); | ||
while (resultSet.next()) { | ||
Book bookFromResultSet = | ||
getBookFromResultSet(resultSet); | ||
books.add(bookFromResultSet); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException( | ||
"Can`t find all books from DB" + books, e); | ||
} | ||
return books; | ||
} | ||
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@Override | ||
public Book update(Book book) { | ||
String updateQuery = | ||
"UPDATE books SET title = ?, price = ? " | ||
+ "WHERE is_deleted = FALSE AND id = ?;"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement updateBookStatement = | ||
connection.prepareStatement(updateQuery)) { | ||
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updateBookStatement.setString(1, book.getTitle()); | ||
updateBookStatement.setObject( | ||
2, book.getPrice()); | ||
updateBookStatement.setLong(3, book.getId()); | ||
updateBookStatement.executeUpdate(); | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t update book: " + book, e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public boolean deleteById(Long id) { | ||
String deleteQuery = "UPDATE books SET is_deleted = TRUE " | ||
+ "WHERE id = ?;"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement deleteBookStatement = | ||
connection.prepareStatement(deleteQuery)) { | ||
deleteBookStatement.setLong(1, id); | ||
return deleteBookStatement.executeUpdate() > 0; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException( | ||
"Can`t delete book by id from DB. id = " + id, e); | ||
} | ||
} | ||
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private Book getBookFromResultSet(ResultSet resultSet) throws SQLException { | ||
Long id = resultSet.getObject("id", Long.class); | ||
String title = resultSet.getString("title"); | ||
BigDecimal price = resultSet.getObject("price", BigDecimal.class); | ||
Book book = new Book(); | ||
book.setId(id); | ||
book.setTitle(title); | ||
book.setPrice(price); | ||
return book; | ||
} | ||
} |
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src/main/java/mate/academy/exception/DataProcessingException.java
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package mate.academy.exception; | ||
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public class DataProcessingException extends RuntimeException { | ||
public DataProcessingException(String message, Throwable ex) { | ||
super(message, ex); | ||
} | ||
} |
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package mate.academy.model; | ||
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import java.math.BigDecimal; | ||
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public class Book { | ||
private Long id; | ||
private String title; | ||
private BigDecimal price; | ||
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public Long getId() { | ||
return id; | ||
} | ||
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public void setId(Long id) { | ||
this.id = id; | ||
} | ||
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public String getTitle() { | ||
return title; | ||
} | ||
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public void setTitle(String title) { | ||
this.title = title; | ||
} | ||
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public BigDecimal getPrice() { | ||
return price; | ||
} | ||
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public void setPrice(BigDecimal price) { | ||
this.price = price; | ||
} | ||
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@Override | ||
public String toString() { | ||
return "Book{" | ||
+ "id=" | ||
+ id | ||
+ ", title='" | ||
+ title | ||
+ '\'' | ||
+ ", price=" | ||
+ price | ||
+ '}'; | ||
} | ||
} |
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package mate.academy.util; | ||
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import java.sql.Connection; | ||
import java.sql.DriverManager; | ||
import java.sql.SQLException; | ||
import java.util.Properties; | ||
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public class ConnectionUtil { | ||
private static final String URL = "jdbc:mysql://localhost:3306/books"; | ||
private static final String USERNAME = "root"; | ||
private static final String PASSWORD = "2121105"; | ||
private static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver"; | ||
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static { | ||
try { | ||
Class.forName(JDBC_DRIVER); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException(e); | ||
} | ||
} | ||
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public static Connection getConnection() { | ||
try { | ||
Properties dbProperties = new Properties(); | ||
dbProperties.put("user", USERNAME); | ||
dbProperties.put("password", PASSWORD); | ||
return DriverManager.getConnection( | ||
URL, dbProperties); | ||
} catch (SQLException e) { | ||
throw new RuntimeException("Can`t create connection to DB", e); | ||
} | ||
} | ||
} |
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CREATE DATABASE `books` | ||
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CREATE TABLE `books`( | ||
`id` bigint NOT NULL AUTO_INCREMENT, | ||
`title` varchar(45) DEFAULT NULL, | ||
`price` bigint DEFAULT NULL, | ||
`is_deleted` tinyint(1) DEFAULT NULL, | ||
PRIMARY KEY (`id`) | ||
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3; |