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JDBC Intro Solution #30
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knyazkyylubomir
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bddcdcf
created Book model, implemented BookDao for working with SQL DB
knyazkyylubomir a88b578
Merge branch 'main' into jv-jdbc-intro
knyazkyylubomir bae0f04
added fixes after review
knyazkyylubomir f4f0da1
Merge branch 'jv-jdbc-intro' of github.com:knyazkyylubomir/jv-jdbc-in…
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Original file line number | Diff line number | Diff line change |
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@@ -1,7 +1,38 @@ | ||
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; | ||
import java.util.List; | ||
import java.util.Optional; | ||
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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); | ||
Book marquezBook = new Book("One Hundred Years of Solitude", new BigDecimal(571)); | ||
Book rowlingBook = new Book(5L, "Harry Potter and the Half-Blood Prince", new BigDecimal(250)); | ||
Book secondMarquezBook = new Book(2L, "No One Writes to the Colonel", new BigDecimal(450)); | ||
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// Book bookUpdated = bookDao.create(marquezBook); | ||
// Book bookUpdated2 = bookDao.create(rowlingBook); | ||
// System.out.println(bookUpdated); | ||
// System.out.println(bookUpdated2); | ||
// | ||
// Optional<Book> bookById = bookDao.findById(3L); | ||
// System.out.println(bookById); | ||
// | ||
// List<Book> allBooks = bookDao.findAll(); | ||
// for (Book element : allBooks) { | ||
// System.out.println(element); | ||
// } | ||
// | ||
// Book updateBook = bookDao.update(rowlingBook); | ||
// System.out.println(updateBook); | ||
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boolean deleteBook = bookDao.deleteById(4L); | ||
System.out.println(deleteBook); | ||
} | ||
} |
28 changes: 28 additions & 0 deletions
28
src/main/java/mate/academy/connection/util/ConnectionUtil.java
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package mate.academy.connection.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"; | ||
private static final Properties DB_PROPERTIES; | ||
private static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver"; | ||
private static final String JDBC_DRIVER_EXCEPTION = "Cannot load JDBC driver"; | ||
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static { | ||
DB_PROPERTIES = new Properties(); | ||
DB_PROPERTIES.put("user", "root"); | ||
DB_PROPERTIES.put("password", "Root1234"); | ||
try { | ||
Class.forName(JDBC_DRIVER); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException(JDBC_DRIVER_EXCEPTION, e); | ||
} | ||
} | ||
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public static Connection getConnection() throws SQLException { | ||
return DriverManager.getConnection(DB_URL, DB_PROPERTIES); | ||
} | ||
} |
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@@ -0,0 +1,17 @@ | ||
package mate.academy.dao; | ||
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import mate.academy.model.Book; | ||
import java.util.List; | ||
import java.util.Optional; | ||
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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 |
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@@ -0,0 +1,107 @@ | ||
package mate.academy.dao; | ||
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import mate.academy.connection.util.ConnectionUtil; | ||
import mate.academy.exception.DataProcessingException; | ||
import mate.academy.lib.Dao; | ||
import mate.academy.model.Book; | ||
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; | ||
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@Dao | ||
public class BookDaoImpl implements BookDao { | ||
private static final int AT_LEAST_ONE = 0; | ||
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@Override | ||
public Book create(Book book) { | ||
String sqlUpdate = "INSERT INTO books (title, price) VALUES (?, ?)"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sqlUpdate, Statement.RETURN_GENERATED_KEYS)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
statement.executeUpdate(); | ||
ResultSet generatedKeys = statement.getGeneratedKeys(); | ||
if (generatedKeys.next()) { | ||
Long id = generatedKeys.getObject(1, Long.class); | ||
book.setId(id); | ||
} | ||
return book; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Cannot add new book: " + book, e); | ||
} | ||
} | ||
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@Override | ||
public Optional<Book> findById(Long id) { | ||
Book book = null; | ||
String sqlQuery = "SELECT * FROM books WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sqlQuery)) { | ||
statement.setLong(1, id); | ||
ResultSet resultSet = statement.executeQuery(); | ||
if (resultSet.next()) { | ||
book = parseBook(resultSet); | ||
} | ||
return Optional.ofNullable(book); | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Cannot get a book by id: " + id, e); | ||
} | ||
} | ||
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@Override | ||
public List<Book> findAll() { | ||
List<Book> books = new ArrayList<>(); | ||
String sqlQuery = "SELECT * FROM books"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sqlQuery)) { | ||
ResultSet resultSet = statement.executeQuery(); | ||
while (resultSet.next()) { | ||
books.add(parseBook(resultSet)); | ||
} | ||
return books; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Cannot get books", e); | ||
} | ||
} | ||
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@Override | ||
public Book update(Book book) { | ||
String sqlUpdate = "UPDATE books SET price = ?, title = ? WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sqlUpdate)) { | ||
statement.setBigDecimal(1, book.getPrice()); | ||
statement.setString(2, book.getTitle()); | ||
statement.setLong(3, book.getId()); | ||
statement.executeUpdate(); | ||
return book; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Cannot update a book by id " + book.getId(), e); | ||
} | ||
} | ||
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@Override | ||
public boolean deleteById(Long id) { | ||
String sqlUpdate = "DELETE FROM books WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.getConnection(); | ||
PreparedStatement statement = connection.prepareStatement(sqlUpdate)) { | ||
statement.setLong(1, id); | ||
int affectedRows = statement.executeUpdate(); | ||
return affectedRows > AT_LEAST_ONE; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Cannot delete a book by id " + id, e); | ||
} | ||
} | ||
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private Book parseBook(ResultSet resultSet) throws SQLException { | ||
Long id = resultSet.getObject("id", Long.class); | ||
String model = resultSet.getString("title"); | ||
BigDecimal price = resultSet.getObject("price", BigDecimal.class); | ||
return new Book(id, model, price); | ||
} | ||
} |
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(message, ex); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,53 @@ | ||
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(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 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 +1,6 @@ | ||
CREATE TABLE `books` ( | ||
`id` BIGINT NOT NULL AUTO_INCREMENT, | ||
`title` VARCHAR(255), | ||
`price` INT, | ||
PRIMARY KEY (`id`) | ||
); |
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I just forgot to uncomment