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- established connection to db - created init_db.sql file in src/main/resources folder - created layer for Book model - used injector and Dao annotation - called all CRUD methods in Main class
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mykoladymchenko
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Aug 2, 2023
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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 { | ||
private static final Injector injector = Injector.getInstance("mate.academy"); | ||
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public static void main(String[] args) { | ||
Book theTimeBook = new Book(); | ||
theTimeBook.setId(1L); | ||
theTimeBook.setTitle("The time"); | ||
theTimeBook.setPrice(BigDecimal.valueOf(80)); | ||
Book myWarBook = new Book(3L, "My war", BigDecimal.valueOf(130)); | ||
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BookDao bookDao = (BookDao) injector.getInstance(BookDao.class); | ||
System.out.println(bookDao.create(myWarBook)); | ||
System.out.println(bookDao.findById(1L).get()); | ||
System.out.println(bookDao.findAll()); | ||
System.out.println(bookDao.update(theTimeBook)); | ||
System.out.println(bookDao.deleteById(2L)); | ||
} | ||
} |
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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> 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; | ||
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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.*; | ||
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 query = "INSERT INTO books (title, price) VALUES(?, ?)"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(query, | ||
Statement.RETURN_GENERATED_KEYS)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
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int affectedRows = statement.executeUpdate(); | ||
if (affectedRows < 1) { | ||
throw new RuntimeException("Expected to insert at" | ||
+ " least one row, but inserted 0 rows"); | ||
} | ||
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ResultSet generatedKeys = statement.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 id = ? AND is_deleted = FALSE"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(query)) { | ||
statement.setLong(1, id); | ||
ResultSet resultSet = statement.executeQuery(); | ||
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Book book = new Book(); | ||
if (resultSet.next()) { | ||
String title = resultSet.getString("title"); | ||
BigDecimal price = resultSet.getBigDecimal("price"); | ||
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book.setId(id); | ||
book.setTitle(title); | ||
book.setPrice(price); | ||
} | ||
return Optional.ofNullable(book); | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't get book by id " + id, e); | ||
} | ||
} | ||
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@Override | ||
public List<Book> findAll() { | ||
String query = "SELECT * FROM books WHERE is_deleted = FALSE"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(query)) { | ||
List<Book> books = new ArrayList<>(); | ||
ResultSet resultSet = statement.executeQuery(); | ||
while (resultSet.next()) { | ||
books.add(getBook(resultSet)); | ||
} | ||
return books; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't find any book", e); | ||
} | ||
} | ||
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@Override | ||
public Book update(Book book) { | ||
String query = "UPDATE books SET title = ?, price = ? " + | ||
"WHERE id = ? AND is_deleted = FALSE"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(query)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
statement.setLong(3, book.getId()); | ||
statement.executeUpdate(); | ||
return book; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't update book " + book, e); | ||
} | ||
} | ||
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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 statement = connection.prepareStatement(query)) { | ||
statement.setLong(1, id); | ||
return statement.executeUpdate() > 0; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't delete book with id " + id, e); | ||
} | ||
} | ||
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private Book getBook(ResultSet resultSet) throws SQLException { | ||
Long id = resultSet.getObject("id", Long.class); | ||
String title = resultSet.getString("title"); | ||
BigDecimal price = resultSet.getBigDecimal("price"); | ||
return new Book(id, title, price); | ||
} | ||
} |
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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 cause) { | ||
super(message, cause); | ||
} | ||
} |
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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 Book() { | ||
} | ||
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public Book(String title, BigDecimal price) { | ||
this.title = title; | ||
this.price = price; | ||
} | ||
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public Book(Long id, String title, BigDecimal price) { | ||
this.id = id; | ||
this.title = title; | ||
this.price = price; | ||
} | ||
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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/book_db"; | ||
private static final String USERNAME = "root"; | ||
private static final String PASSWORD = "123456789"; | ||
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("Can't find SQL Driver", e); | ||
} | ||
} | ||
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public static Connection getConnection() throws SQLException { | ||
Properties dbProperties = new Properties(); | ||
dbProperties.setProperty("user", USERNAME); | ||
dbProperties.setProperty("password", PASSWORD); | ||
return DriverManager.getConnection(URL, dbProperties); | ||
} | ||
} |
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CREATE SCHEMA IF NOT EXISTS `book_db` DEFAULT CHARACTER SET utf8; | ||
USE `book_db`; | ||
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CREATE TABLE `books` ( | ||
`id` int NOT NULL AUTO_INCREMENT, | ||
`title` varchar(200) DEFAULT NULL, | ||
`price` decimal(10,0) DEFAULT NULL, | ||
`is_deleted` tinyint DEFAULT '0', | ||
PRIMARY KEY (`id`) | ||
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb3; |