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created, fixed classes and files in jv-jdbc-intro task #361
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package mate.academy; | ||
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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 DB_PATH = "jdbc:mysql://localhost:3306/intro"; | ||
private static final Properties DB_PROPERTIES; | ||
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static { | ||
DB_PROPERTIES = new Properties(); | ||
DB_PROPERTIES.put("user", "root"); | ||
DB_PROPERTIES.put("password", "root1234"); | ||
try { | ||
Class.forName("com.mysql.cj.jdbc.Driver"); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException("Can't load JDBC driver", e); | ||
} | ||
} | ||
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public static Connection getConnection() throws SQLException { | ||
return DriverManager.getConnection(DB_PATH, DB_PROPERTIES); | ||
} | ||
} |
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@@ -1,7 +1,31 @@ | ||
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"); | ||
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public static void main(String[] args) { | ||
BookDao bookDao = (BookDao) injector.getInstance(BookDao.class); | ||
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Book firstBook = new Book("A Story of yesterday", new BigDecimal("150.50")); | ||
bookDao.create(firstBook); | ||
Book secondBook = new Book("A Love story", new BigDecimal("332.17")); | ||
bookDao.create(secondBook); | ||
Book thirdBook = new Book("The elephant tree", new BigDecimal("245.83")); | ||
bookDao.create(thirdBook); | ||
Book fourthBook = new Book("This is not a novel", new BigDecimal("157.74")); | ||
bookDao.create(fourthBook); | ||
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System.out.println(bookDao.findById(2L)); | ||
secondBook.setPrice(new BigDecimal("196.59")); | ||
System.out.println(bookDao.update(secondBook)); | ||
System.out.println(bookDao.findById(2L)); | ||
System.out.println(bookDao.findAll()); | ||
System.out.println(bookDao.deleteById(3L)); | ||
System.out.println(bookDao.findAll()); | ||
} | ||
} |
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@@ -0,0 +1,17 @@ | ||
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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@@ -0,0 +1,114 @@ | ||
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.ConnectionUtil; | ||
import mate.academy.exception.DataProcessingException; | ||
import mate.academy.lib.Dao; | ||
import mate.academy.model.Book; | ||
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@Dao | ||
public class BookDaoImpl implements BookDao { | ||
@Override | ||
public Book create(Book book) { | ||
String sql = "INSERT INTO books (title, price) VALUES (?, ?)"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement( | ||
sql, Statement.RETURN_GENERATED_KEYS)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
int affectedRows = statement.executeUpdate(); | ||
if (affectedRows < 1) { | ||
throw new RuntimeException("Expected to insert 1 row, " | ||
+ "but inserted 0 rows"); | ||
} | ||
ResultSet generateKeys = statement.getGeneratedKeys(); | ||
if (generateKeys.next()) { | ||
Long id = generateKeys.getObject(1, Long.class); | ||
book.setId(id); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't add new book " + book, e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public Optional<Book> findById(Long id) { | ||
String sql = "SELECT * FROM books WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
statement.setLong(1, id); | ||
ResultSet resultSet = statement.executeQuery(); | ||
if (resultSet.next()) { | ||
return Optional.of(createNewBook(resultSet)); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't find book by id" + id, e); | ||
} | ||
return Optional.empty(); | ||
} | ||
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@Override | ||
public List<Book> findAll() { | ||
List<Book> books = new ArrayList<>(); | ||
String sql = "SELECT * FROM books"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
ResultSet resultSet = statement.executeQuery(); | ||
while (resultSet.next()) { | ||
books.add(createNewBook(resultSet)); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't get a list of books from table", e); | ||
} | ||
return books; | ||
} | ||
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@Override | ||
public Book update(Book book) { | ||
String sql = "UPDATE books SET title = ?, price = ? WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
statement.setLong(3, book.getId()); | ||
int affectedRows = statement.executeUpdate(); | ||
if (affectedRows < 1) { | ||
throw new RuntimeException("Expected to update 1 row, " | ||
+ "but updated 0 rows"); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't update data of the book " + book, e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public boolean deleteById(Long id) { | ||
String sql = "DELETE FROM books WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
statement.setLong(1, id); | ||
int updatedRows = statement.executeUpdate(); | ||
return updatedRows > 0; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't delete the book with id " + id, e); | ||
} | ||
} | ||
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private Book createNewBook(ResultSet resultSet) throws SQLException { | ||
Book book = new Book(); | ||
book.setId(resultSet.getObject("id", Long.class)); | ||
book.setTitle(resultSet.getString("title")); | ||
book.setPrice(resultSet.getObject("price", BigDecimal.class)); | ||
return book; | ||
} | ||
} |
7 changes: 7 additions & 0 deletions
7
src/main/java/mate/academy/exception/DataProcessingException.java
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@@ -0,0 +1,7 @@ | ||
package mate.academy.exception; | ||
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public class DataProcessingException extends RuntimeException { | ||
public DataProcessingException(String message, Throwable ex) { | ||
super(); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,49 @@ | ||
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 Book(String title, BigDecimal price) { | ||
this.title = title; | ||
this.price = 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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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,6 @@ | ||
CREATE TABLE books ( | ||
id BIGINT AUTO_INCREMENT, | ||
title VARCHAR(255), | ||
price DECIMAL(10, 2), | ||
PRIMARY KEY (id) | ||
); |
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there is no parameters, so please use Statement instead of Prepared one