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implemented task #63
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ihorvasylenko23
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implemented task #63
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package mate.academy; | ||
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public class DataProcessingException extends RuntimeException { | ||
public DataProcessingException(String message, Throwable ex) { | ||
super(message, ex); | ||
} | ||
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public DataProcessingException(String message) { | ||
super(message); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -1,7 +1,24 @@ | ||
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; | ||
import java.util.Optional; | ||
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public class Main { | ||
public static void main(String[] args) { | ||
private static final Injector injector = Injector.getInstance("mate.academy.dao"); | ||
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public static void main(String[] args) { | ||
BookDao bookDao = (BookDao) injector.getInstance(BookDao.class); | ||
Book book = new Book(); | ||
book.setTitle("Sample"); | ||
book.setPrice(BigDecimal.valueOf(5.99)); | ||
bookDao.create(book); | ||
Optional<Book> foundBook = bookDao.findById(book.getId()); | ||
bookDao.findAll(); | ||
Book updatedBook = foundBook.orElseThrow(); | ||
bookDao.update(updatedBook); | ||
bookDao.deleteById(book.getId()); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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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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Original file line number | Diff line number | Diff line change | ||||||||
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package mate.academy.dao; | ||||||||||
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import mate.academy.DataProcessingException; | ||||||||||
import mate.academy.model.Book; | ||||||||||
import mate.academy.lib.Dao; | ||||||||||
import java.math.BigDecimal; | ||||||||||
import java.sql.Connection; | ||||||||||
import java.sql.DriverManager; | ||||||||||
import java.sql.PreparedStatement; | ||||||||||
import java.sql.ResultSet; | ||||||||||
import java.sql.SQLException; | ||||||||||
import java.util.ArrayList; | ||||||||||
import java.util.List; | ||||||||||
import java.util.Optional; | ||||||||||
import java.util.Properties; | ||||||||||
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@Dao | ||||||||||
public class BookDaoImpl implements BookDao { | ||||||||||
@Override | ||||||||||
public Book create(Book book) { | ||||||||||
String query = "INSERT INTO books (title, price) VALUES (?, ?)"; | ||||||||||
try (Connection connection = getConnection(); | ||||||||||
PreparedStatement statement = connection.prepareStatement(query, | ||||||||||
PreparedStatement.RETURN_GENERATED_KEYS)) { | ||||||||||
setBookParameters(statement, book); | ||||||||||
statement.executeUpdate(); | ||||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. i think there should be
Suggested change
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try (ResultSet generatedKeys = statement.getGeneratedKeys()) { | ||||||||||
if (generatedKeys.next()) { | ||||||||||
Long id = generatedKeys.getObject(1, Long.class); | ||||||||||
book.setId(id); | ||||||||||
} else { | ||||||||||
throw new SQLException("Creating book " + book + " failed, no ID obtained."); | ||||||||||
} | ||||||||||
} | ||||||||||
return book; | ||||||||||
} catch (SQLException e) { | ||||||||||
throw new DataProcessingException("Failed to create book " + book, e); | ||||||||||
} | ||||||||||
} | ||||||||||
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@Override | ||||||||||
public Optional<Book> findById(Long id) { | ||||||||||
String query = "SELECT * FROM books WHERE id = ?"; | ||||||||||
try (Connection connection = getConnection(); | ||||||||||
PreparedStatement statement = connection.prepareStatement(query)) { | ||||||||||
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statement.setLong(1, id); | ||||||||||
try (ResultSet resultSet = statement.executeQuery()) { | ||||||||||
if (resultSet.next()) { | ||||||||||
return Optional.of(parseBook(resultSet)); | ||||||||||
} | ||||||||||
} | ||||||||||
return Optional.empty(); | ||||||||||
} catch (SQLException e) { | ||||||||||
throw new DataProcessingException("Failed to find book by ID " + id, e); | ||||||||||
} | ||||||||||
} | ||||||||||
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@Override | ||||||||||
public List<Book> findAll() { | ||||||||||
String query = "SELECT * FROM books"; | ||||||||||
try (Connection connection = getConnection(); | ||||||||||
PreparedStatement statement = connection.prepareStatement(query); | ||||||||||
ResultSet resultSet = statement.executeQuery()) { | ||||||||||
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List<Book> books = new ArrayList<>(); | ||||||||||
while (resultSet.next()) { | ||||||||||
books.add(parseBook(resultSet)); | ||||||||||
} | ||||||||||
return books; | ||||||||||
} catch (SQLException e) { | ||||||||||
throw new DataProcessingException("Failed to get all books", e); | ||||||||||
} | ||||||||||
} | ||||||||||
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@Override | ||||||||||
public Book update(Book book) { | ||||||||||
String query = "UPDATE books SET title = ?, price = ? WHERE id = ?"; | ||||||||||
try (Connection connection = getConnection(); | ||||||||||
PreparedStatement statement = connection.prepareStatement(query)) { | ||||||||||
setBookParameters(statement, book); | ||||||||||
statement.setLong(3, book.getId()); | ||||||||||
statement.executeUpdate(); | ||||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. i think there should be
Suggested change
|
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return book; | ||||||||||
} catch (SQLException e) { | ||||||||||
throw new DataProcessingException("Failed to update book" + book, e); | ||||||||||
} | ||||||||||
} | ||||||||||
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@Override | ||||||||||
public boolean deleteById(Long id) { | ||||||||||
String query = "DELETE FROM books WHERE id = ?"; | ||||||||||
try (Connection connection = getConnection(); | ||||||||||
PreparedStatement statement = connection.prepareStatement(query)) { | ||||||||||
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statement.setLong(1, id); | ||||||||||
int rowsDeleted = statement.executeUpdate(); | ||||||||||
return rowsDeleted > 0; | ||||||||||
} catch (SQLException e) { | ||||||||||
throw new DataProcessingException("Failed to delete book by ID " + id, e); | ||||||||||
} | ||||||||||
} | ||||||||||
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private Connection getConnection() throws SQLException { | ||||||||||
Properties dbProperties = new Properties(); | ||||||||||
dbProperties.put("user", "root"); | ||||||||||
dbProperties.put("password", "Vika07012000"); | ||||||||||
return DriverManager.getConnection("jdbc:mysql://localhost:3306/books", dbProperties); | ||||||||||
} | ||||||||||
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private Book parseBook(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; | ||||||||||
} | ||||||||||
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private void setBookParameters(PreparedStatement statement, Book book) throws SQLException { | ||||||||||
statement.setString(1, book.getTitle()); | ||||||||||
statement.setBigDecimal(2, book.getPrice()); | ||||||||||
} | ||||||||||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,36 @@ | ||
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 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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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,6 @@ | ||
CREATE TABLE `books` ( | ||
`id` BIGINT NOT NULL AUTO_INCREMENT, | ||
`title` VARCHAR(255) NOT NULL, | ||
`price` DECIMAL(10, 2) NOT NULL, | ||
PRIMARY KEY (id) | ||
); |
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