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Jbdc #384
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Jbdc #384
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7c22530
test
ChabVlad 9c68de0
done
ChabVlad 18afabf
init_db, selectedBook to book
ChabVlad 80d8c27
init_db, selectedBook to book
ChabVlad 51e20c6
Merge remote-tracking branch 'origin/jbdc' into jbdc
ChabVlad e552e90
'final' was added to Main method, injector
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Original file line number | Diff line number | Diff line change |
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@@ -1,7 +1,29 @@ | ||
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 { | ||
public static void main(String[] args) { | ||
private static Injector injector = Injector.getInstance("mate.academy"); | ||
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public static void main(String[] args) { | ||
Book harryPotter = new Book(); | ||
harryPotter.setTitle("Harry Potter"); | ||
harryPotter.setPrice(BigDecimal.valueOf(25)); | ||
Book lordOfTheRings = new Book(); | ||
lordOfTheRings.setTitle("Lord of the Rings"); | ||
lordOfTheRings.setPrice(BigDecimal.valueOf(15)); | ||
BookDao bookDao = (BookDao) injector.getInstance(BookDao.class); | ||
Book harryPotterBook = bookDao.create(harryPotter); | ||
Book lotrBook = bookDao.create(lordOfTheRings); | ||
System.out.println(harryPotterBook); | ||
System.out.println(lotrBook); | ||
bookDao.findAll().forEach(System.out::println); | ||
harryPotter.setPrice(BigDecimal.valueOf(50)); | ||
bookDao.update(harryPotter); | ||
bookDao.deleteById(1L); | ||
bookDao.findById(2L).ifPresent(System.out::println); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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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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Original file line number | Diff line number | Diff line change | ||||
---|---|---|---|---|---|---|
@@ -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.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 { | ||||||
@Override | ||||||
public Book create(Book book) { | ||||||
String sql = "INSERT INTO books (title, price) VALUES (?, ?);"; | ||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||
PreparedStatement preparedStatement | ||||||
= connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) { | ||||||
preparedStatement.setString(1, book.getTitle()); | ||||||
preparedStatement.setString(2, book.getPrice().toString()); | ||||||
preparedStatement.executeUpdate(); | ||||||
ResultSet resultSet = preparedStatement.getGeneratedKeys(); | ||||||
if (resultSet.next()) { | ||||||
Long id = resultSet.getObject(1, Long.class); | ||||||
book.setId(id); | ||||||
} | ||||||
return book; | ||||||
} catch (SQLException e) { | ||||||
throw new DataProcessingException("Can not create book" + book, e); | ||||||
} | ||||||
} | ||||||
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@Override | ||||||
public Optional<Book> findById(Long id) { | ||||||
String sql = "SELECT * FROM books WHERE id = ?;"; | ||||||
Book book; | ||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||
PreparedStatement preparedStatement | ||||||
= connection.prepareStatement(sql)) { | ||||||
preparedStatement.setLong(1, id); | ||||||
ResultSet resultSet = preparedStatement.executeQuery(); | ||||||
if (resultSet.next()) { | ||||||
book = getBook(resultSet); | ||||||
return Optional.of(book); | ||||||
} | ||||||
} catch (SQLException e) { | ||||||
throw new DataProcessingException("Can ot find book by id" + id, e); | ||||||
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Suggested change
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} | ||||||
return Optional.empty(); | ||||||
} | ||||||
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@Override | ||||||
public List<Book> findAll() { | ||||||
String sql = "SELECT * FROM books;"; | ||||||
List<Book> books = new ArrayList<>(); | ||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||
PreparedStatement preparedStatement | ||||||
= connection.prepareStatement(sql)) { | ||||||
ResultSet resultSet = preparedStatement.executeQuery(); | ||||||
while (resultSet.next()) { | ||||||
books.add(getBook(resultSet)); | ||||||
} | ||||||
return books; | ||||||
} catch (SQLException e) { | ||||||
throw new DataProcessingException("Can not find books from db", e); | ||||||
} | ||||||
} | ||||||
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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 preparedStatement | ||||||
= connection.prepareStatement(sql)) { | ||||||
preparedStatement.setString(1, book.getTitle()); | ||||||
preparedStatement.setString(2, book.getPrice().toString()); | ||||||
preparedStatement.setLong(3, book.getId()); | ||||||
preparedStatement.executeUpdate(); | ||||||
return book; | ||||||
} catch (SQLException e) { | ||||||
throw new DataProcessingException("Can not update book from db" + book, e); | ||||||
} | ||||||
} | ||||||
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@Override | ||||||
public boolean deleteById(Long id) { | ||||||
String sql = "DELETE FROM books WHERE id = ?;"; | ||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||
PreparedStatement preparedStatement | ||||||
= connection.prepareStatement(sql)) { | ||||||
preparedStatement.setLong(1, id); | ||||||
return preparedStatement.executeUpdate() > 0; | ||||||
} catch (SQLException e) { | ||||||
throw new DataProcessingException("Can not delete by id from db" + 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"); | ||||||
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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Original file line number | Diff line number | Diff line change |
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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 e) { | ||
super(message, e); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -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 +1,32 @@ | ||
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 { | ||
public static final String SQL_DRIVER = "com.mysql.cj.jdbc.Driver"; | ||
public static final String DB_URL = "jdbc:mysql://localhost:3306/books_db"; | ||
public static final String USER = "root"; | ||
public static final String PASSWORD = "!Vladius080197"; | ||
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static { | ||
try { | ||
Class.forName(SQL_DRIVER); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException("Can not load JDBC driver.", e); | ||
} | ||
} | ||
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public static Connection getConnection() { | ||
try { | ||
Properties properties = new Properties(); | ||
properties.setProperty("user", USER); | ||
properties.setProperty("password", PASSWORD); | ||
return DriverManager.getConnection(DB_URL, properties); | ||
} catch (SQLException e) { | ||
throw new RuntimeException("Can not create connection to database", e); | ||
} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,7 @@ | ||
CREATE DATABASE 'books_db'; | ||
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CREATE TABLE 'books' ( | ||
'id' BIGINT PRIMARY KEY AUTO_INCREMENT, | ||
'title' VARCHAR(255) NOT NULL, | ||
'price' DECIMAL NOT NULL | ||
); |
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