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established connection to DB, created Book entity class and BookDao i… #340
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Original file line number | Diff line number | Diff line change |
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@@ -1,7 +1,30 @@ | ||
package mate.academy; | ||
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import java.math.BigDecimal; | ||
import java.util.Optional; | ||
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 book = new Book(); | ||
book.setTitle("Sherlock Holmes"); | ||
book.setPrice(BigDecimal.valueOf(110L)); | ||
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Book savedBook = bookDao.create(book); | ||
Optional<Book> bookById = bookDao.findById(savedBook.getId()); | ||
System.out.println(bookById); | ||
System.out.println(bookDao.findAll()); | ||
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book.setPrice(BigDecimal.valueOf(371L)); | ||
bookDao.update(book); | ||
bookDao.findById(savedBook.getId()); | ||
bookDao.deleteById(savedBook.getId()); | ||
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 +1,129 @@ | ||
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.exception.DataProcessingException; | ||
import mate.academy.lib.Dao; | ||
import mate.academy.model.Book; | ||
import mate.academy.util.ConnectionUtil; | ||
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@Dao | ||
public class BookDaoImpl implements BookDao { | ||
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@Override | ||
public Book create(Book book) { | ||
String insertRequest = "INSERT INTO books (title, price) VALUES (?, ?)"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement createObjectStatement | ||
= connection.prepareStatement(insertRequest, | ||
Statement.RETURN_GENERATED_KEYS)) { | ||
createObjectStatement.setString(1, book.getTitle()); | ||
createObjectStatement.setBigDecimal(2, book.getPrice()); | ||
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int affectedRows = createObjectStatement.executeUpdate(); | ||
if (affectedRows < 1) { | ||
throw new RuntimeException("Expected to insert at least 1 row, " | ||
+ "but inserted 0 rows"); | ||
} | ||
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ResultSet generatedKeys = createObjectStatement.getGeneratedKeys(); | ||
if (generatedKeys.next()) { | ||
book.setId(generatedKeys.getLong(1)); | ||
} | ||
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} 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 getRequest = "SELECT * FROM books WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement getBookStatement | ||
= connection.prepareStatement(getRequest)) { | ||
getBookStatement.setLong(1, id); | ||
ResultSet resultSet = getBookStatement.executeQuery(); | ||
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if (resultSet.next()) { | ||
Book book = createBook(resultSet); | ||
return Optional.of(book); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t get book by id = " + id, e); | ||
} | ||
return Optional.empty(); | ||
} | ||
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@Override | ||
public List<Book> findAll() { | ||
List<Book> books = new ArrayList<>(); | ||
String getAllRequest = "SELECT * FROM books"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement getAllBooksStatement | ||
= connection.prepareStatement(getAllRequest)) { | ||
ResultSet resultSet = getAllBooksStatement.executeQuery(); | ||
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while (resultSet.next()) { | ||
Book book = createBook(resultSet); | ||
books.add(book); | ||
} | ||
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} 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 updateRequest = "UPDATE books SET title = ?, price = ? WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement updateBookStatement | ||
= connection.prepareStatement(updateRequest)) { | ||
updateBookStatement.setString(1, book.getTitle()); | ||
updateBookStatement.setBigDecimal(2, book.getPrice()); | ||
updateBookStatement.setString(3, String.valueOf(book.getId())); | ||
updateBookStatement.executeUpdate(); | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t update book " | ||
+ book + " from DB", e); | ||
} | ||
return book; | ||
} | ||
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@Override | ||
public boolean deleteById(Long id) { | ||
String deleteRequest = "DELETE FROM books WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement deletedStatement | ||
= connection.prepareStatement(deleteRequest)) { | ||
deletedStatement.setLong(1, id); | ||
int rowsAffected = deletedStatement.executeUpdate(); | ||
return rowsAffected > 0; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can`t delete book by id " | ||
+ id + " from DB", e); | ||
} | ||
} | ||
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private static Book createBook(ResultSet resultSet) throws SQLException { | ||
Long id = resultSet.getObject("id", Long.class); | ||
String title = resultSet.getString("title"); | ||
BigDecimal price = resultSet.getObject("price", BigDecimal.class); | ||
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/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 cause) { | ||
super(message, cause); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,42 @@ | ||
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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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,28 @@ | ||
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 DB_URL = "jdbc:mysql://localhost:3306/test"; | ||
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private static final Properties DB_PROPERTIES; | ||
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static { | ||
DB_PROPERTIES = new Properties(); | ||
DB_PROPERTIES.put("user", "root"); | ||
DB_PROPERTIES.put("password", "202-42HP"); | ||
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try { | ||
Class.forName("com.mysql.cj.jdbc.Driver"); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException("Can not load JDBC driver for MySQL", e); | ||
} | ||
} | ||
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public static Connection getConnection() throws SQLException { | ||
return DriverManager.getConnection(DB_URL, DB_PROPERTIES); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,7 @@ | ||
CREATE DATABASE test; | ||
CREATE TABLE books ( | ||
id BIGINT NOT NULL AUTO_INCREMENT, | ||
title VARCHAR(255), | ||
price DECIMAL(10,2), | ||
PRIMARY KEY (id) | ||
); | ||
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