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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.model.Book; | ||
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public class Main { | ||
private static final Injector injector = Injector.getInstance("mate.academy"); | ||
private static final BookDao bookDao = (BookDao) injector.getInstance(BookDao.class); | ||
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public static void main(String[] args) { | ||
Book book1 = new Book(); | ||
book1.setTitle("SQL for Data Analysis"); | ||
book1.setPrice(BigDecimal.valueOf(500)); | ||
book1 = bookDao.create(book1); | ||
Book book2 = new Book(); | ||
book2.setTitle("Effective Java"); | ||
book2.setPrice(BigDecimal.valueOf(800)); | ||
book2 = bookDao.create(book2); | ||
System.out.println(bookDao.findById(book2.getId())); | ||
System.out.println(bookDao.getAll()); | ||
System.out.println(bookDao.delete(book1.getId())); | ||
book2.setTitle("Joshua Bloch: Effective Java"); | ||
book2.setPrice(BigDecimal.valueOf(850)); | ||
bookDao.update(book2); | ||
System.out.println(bookDao.getAll()); | ||
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} | ||
} |
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package mate.academy.dao; | ||
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import java.util.List; | ||
import java.util.Optional; | ||
import mate.academy.model.Book; | ||
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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> getAll(); | ||
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Book update(Book book); | ||
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boolean delete(Long id); | ||
} |
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package mate.academy.dao; | ||
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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.exceptions.DataProcessingException; | ||
import mate.academy.lib.Dao; | ||
import mate.academy.model.Book; | ||
import mate.academy.utils.ConnectionUtil; | ||
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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 statement = connection | ||
.prepareStatement(insertBookQuery, Statement.RETURN_GENERATED_KEYS)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
int affectedRows = statement.executeUpdate(); | ||
if (affectedRows < 1) { | ||
throw new DataProcessingException("Excepted to insert at least one row, " | ||
+ "but inserted 0 rows", | ||
new RuntimeException()); | ||
} | ||
ResultSet generatedKeys = statement.getGeneratedKeys(); | ||
if (generatedKeys.next()) { | ||
Long id = generatedKeys.getObject(1, Long.class); | ||
book.setId(id); | ||
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} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't create book with title: " | ||
+ book.getTitle() | ||
+ ", and price: " | ||
+ book.getPrice() + ":", e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public Optional<Book> findById(Long id) { | ||
String findBookQuery = "SELECT * from books WHERE id = ? AND is_deleted = FALSE;"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection | ||
.prepareStatement(findBookQuery)) { | ||
statement.setLong(1, id); | ||
ResultSet resultSet = statement.executeQuery(); | ||
Book book = null; | ||
if (resultSet.next()) { | ||
book = getBookFromResultSet(resultSet); | ||
} | ||
return Optional.ofNullable(book); | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't find book from id " + id + ":", e); | ||
} | ||
} | ||
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@Override | ||
public List<Book> getAll() { | ||
List<Book> books = new ArrayList<>(); | ||
String getAllBookQuery = "SELECT * FROM books WHERE is_deleted = FALSE;"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection | ||
.prepareStatement(getAllBookQuery)) { | ||
ResultSet resultSet = statement.executeQuery(); | ||
while (resultSet.next()) { | ||
books.add(getBookFromResultSet(resultSet)); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't get all books from DB:", e); | ||
} | ||
return books; | ||
} | ||
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@Override | ||
public Book update(Book book) { | ||
String updateBookQuery = | ||
"UPDATE books SET title = ?, price = ? WHERE id = ? AND is_deleted = FALSE;"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection | ||
.prepareStatement(updateBookQuery)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
statement.setLong(3, book.getId()); | ||
int affectedRows = statement.executeUpdate(); | ||
if (affectedRows < 1) { | ||
throw new DataProcessingException("Excepted to update at least one row, " | ||
+ "but updated 0 rows:", | ||
new RuntimeException()); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't update book by id:" + book.getId(), e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public boolean delete(Long id) { | ||
String deleteBookQuery = "UPDATE books SET is_deleted = TRUE WHERE id = ?;"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection | ||
.prepareStatement(deleteBookQuery)) { | ||
statement.setLong(1, id); | ||
int affectedRows = statement.executeUpdate(); | ||
return affectedRows > 0; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't delete book by 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.getBigDecimal("price"); | ||
Book book = new Book(); | ||
book.setId(id); | ||
book.setTitle(title); | ||
book.setPrice(price); | ||
return book; | ||
} | ||
} |
7 changes: 7 additions & 0 deletions
7
src/main/java/mate/academy/exceptions/DataProcessingException.java
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package mate.academy.exceptions; | ||
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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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CREATE TABLE `books` ( | ||
`id` bigint NOT NULL AUTO_INCREMENT, | ||
`title` varchar(45) DEFAULT NULL, | ||
`price` decimal(10,2) DEFAULT NULL, | ||
`is_deleted` bit(1) NOT NULL DEFAULT b'0', | ||
PRIMARY KEY (`id`), | ||
UNIQUE KEY `id_UNIQUE` (`id`) | ||
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; | ||
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@@ -0,0 +1,29 @@ | ||
package mate.academy.utils; | ||
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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 USERNAME = "root"; | ||
private static final String PASSWORD = "12345678"; | ||
private static final String DB_URL = "jdbc:mysql://localhost:3306/library"; | ||
private static final String DRIVER_PACKAGE = "com.mysql.cj.jdbc.Driver"; | ||
private static final Properties DB_PROPERTIES; | ||
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static { | ||
DB_PROPERTIES = new Properties(); | ||
DB_PROPERTIES.put("user", USERNAME); | ||
DB_PROPERTIES.put("password", PASSWORD); | ||
try { | ||
Class.forName(DRIVER_PACKAGE); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException("Can not load JDBC driver :" + e); | ||
} | ||
} | ||
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public static Connection getConnection() throws SQLException { | ||
return DriverManager.getConnection(DB_URL, DB_PROPERTIES); | ||
} | ||
} |