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package mate.academy; | ||
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import java.math.BigDecimal; | ||
import mate.academy.dao.BookDao; | ||
import mate.academy.lib.Injector; | ||
import mate.academy.models.Book; | ||
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public class Main { | ||
private 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); | ||
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Book book = new Book(); | ||
book.setTitle("Kobzar"); | ||
book.setPrice(BigDecimal.valueOf(500)); | ||
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Book book1 = bookDao.create(book); | ||
book1.setPrice(BigDecimal.valueOf(700)); | ||
System.out.println(book1); | ||
bookDao.update(book1); | ||
System.out.println(bookDao.findById(book1.getId())); | ||
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bookDao.fingAll().forEach(System.out::println); | ||
bookDao.fingAll().forEach(b -> bookDao.deleteById(b.getId())); | ||
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} | ||
} |
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package mate.academy.dao; | ||
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import mate.academy.models.Book; | ||
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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> fingAll(); | ||
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Book update(Book book); | ||
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boolean deleteById(Long id); | ||
} |
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package mate.academy.dao; | ||
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import java.math.BigDecimal; | ||
import java.sql.*; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
import java.util.Objects; | ||
import java.util.Optional; | ||
import mate.academy.lib.Dao; | ||
import mate.academy.lib.DataProcessingException; | ||
import mate.academy.models.Book; | ||
import mate.academy.util.ConnectionUtil; | ||
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@Dao | ||
public class BookDaoImpl implements BookDao{ | ||
@Override | ||
public Book create(Book book) { | ||
String query = "INSERT INTO books(tittle, price) VALUES(?, ?)"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement createBookStatement = connection | ||
.prepareStatement(query, Statement.RETURN_GENERATED_KEYS)) { | ||
createBookStatement.setString(1, book.getTitle()); | ||
createBookStatement.setBigDecimal(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 " | ||
+ book + " to DB", e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public Optional<Book> findById(Long id) { | ||
String query = "SELECT * FROM books WHERE is_deleted = FALSE"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement getAllBookStatement = connection | ||
.prepareStatement(query)) { | ||
ResultSet resultSet = getAllBookStatement.executeQuery(); | ||
while (resultSet.next()) { | ||
Long identifier = resultSet.getObject("id", Long.class); | ||
if (Objects.equals(id, identifier)) { | ||
Book book = getBook(resultSet); | ||
return Optional.of(book); | ||
} | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t get book with id = " | ||
+ id + " from DB", e); | ||
} | ||
return Optional.empty(); | ||
} | ||
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@Override | ||
public List<Book> fingAll() { | ||
String query = "SELECT * FROM books WHERE is_deleted = FALSE"; | ||
List<Book> allBook = new ArrayList<>(); | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement getAllBookStatement = connection | ||
.prepareStatement(query)) { | ||
ResultSet resultSet = getAllBookStatement.executeQuery(); | ||
while (resultSet.next()) { | ||
Book book = getBook(resultSet); | ||
allBook.add(book); | ||
} | ||
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} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t get all manufacturers from DB", e); | ||
} | ||
return allBook; } | ||
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@Override | ||
public Book update(Book book) { | ||
String query = "UPDATE books SET tittle = ?, price = ? " | ||
+ "WHERE id = ? AND is_deleted = FALSE"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement createBookStatement = connection | ||
.prepareStatement(query)) { | ||
createBookStatement.setString(1, book.getTitle()); | ||
createBookStatement.setBigDecimal(2, book.getPrice()); | ||
createBookStatement.setLong(3, book.getId()); | ||
createBookStatement.executeUpdate(); | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t update book " | ||
+ book + " to DB", e); | ||
} | ||
return book; } | ||
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@Override | ||
public boolean deleteById(Long id) { | ||
String query = "UPDATE books SET is_deleted = TRUE WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement deleteBookStatement = connection | ||
.prepareStatement(query)) { | ||
deleteBookStatement.setLong(1, id); | ||
int updateRows = deleteBookStatement.executeUpdate(); | ||
return updateRows > 0; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t delete book with id " | ||
+ id + " from DB", e); | ||
} | ||
} | ||
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private Book getBook(ResultSet resultSet) throws SQLException { | ||
String tittle = resultSet.getString("tittle"); | ||
long price = resultSet.getLong("price"); | ||
Long id = resultSet.getObject("id", Long.class); | ||
Book book = new Book(); | ||
book.setId(id); | ||
book.setTitle(tittle); | ||
book.setPrice(BigDecimal.valueOf(price)); | ||
return book; | ||
} | ||
} |
11 changes: 11 additions & 0 deletions
11
src/main/java/mate/academy/lib/DataProcessingException.java
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package mate.academy.lib; | ||
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public class DataProcessingException extends RuntimeException { | ||
private String message; | ||
private Throwable ex; | ||
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public DataProcessingException(String message, Throwable ex) { | ||
this.message = message; | ||
this.ex = ex; | ||
} | ||
} |
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package mate.academy.models; | ||
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import java.math.BigDecimal; | ||
import java.util.Objects; | ||
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public class Book { | ||
private Long id; | ||
private String title; | ||
private BigDecimal price; | ||
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public Book() { | ||
} | ||
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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 boolean equals(Object o) { | ||
if (this == o) return true; | ||
if (o == null || getClass() != o.getClass()) return false; | ||
Book book = (Book) o; | ||
return Objects.equals(id, book.id) && Objects.equals(title, book.title) && Objects.equals(price, book.price); | ||
} | ||
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@Override | ||
public int hashCode() { | ||
return Objects.hash(id, title, price); | ||
} | ||
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@Override | ||
public String toString() { | ||
return "Book{" | ||
+ "id=" + id | ||
+ ", title='" + title + '\'' | ||
+ ", price=" + price | ||
+ '}'; | ||
} | ||
} |
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@@ -0,0 +1,30 @@ | ||
package mate.academy.util; | ||
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import mate.academy.lib.DataProcessingException; | ||
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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 { | ||
static { | ||
try { | ||
Class.forName("com.mysql.cj.jdbc.Driver"); | ||
} catch (ClassNotFoundException e) { | ||
throw new DataProcessingException("Cant load JDBC driver for MySQL", e); | ||
} | ||
} | ||
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public static Connection getConnection() { | ||
try { | ||
Properties dbProperties = new Properties(); | ||
dbProperties.put("user", "root"); | ||
dbProperties.put("password", "admin"); | ||
return DriverManager.getConnection("jdbc:mysql://localhost:3306/library_db", | ||
dbProperties); | ||
} catch (SQLException x) { | ||
throw new DataProcessingException("Cant create connection to DB", x); | ||
} | ||
} | ||
} |
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CREATE DATABASE `library_db` /*!40100 DEFAULT CHARACTER SET utf8mb3 */ /*!80016 DEFAULT ENCRYPTION='N' */; | ||
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CREATE TABLE `books` ( | ||
`id` bigint NOT NULL AUTO_INCREMENT, | ||
`tittle` varchar(255) DEFAULT NULL, | ||
`price` bigint DEFAULT NULL, | ||
`is_deleted` tinyint NOT NULL DEFAULT '0', | ||
PRIMARY KEY (`id`) | ||
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; |