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Hw jv jdbc intro #359
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Hw jv jdbc intro #359
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6317543
added dependencies
snowfallen bc5b093
added init sql script file for table creation
snowfallen 3977e7d
added custom exception class
snowfallen 5a6c191
added model
snowfallen c8eae8f
added db connector
snowfallen 34a3878
implemented dao
snowfallen 92bc63f
tested the app
snowfallen 180a878
fixed
snowfallen e42429d
fixed
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Original file line number | Diff line number | Diff line change |
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@@ -1,7 +1,34 @@ | ||
package mate.academy; | ||
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import java.math.BigDecimal; | ||
import java.util.List; | ||
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", BigDecimal.valueOf(100)); | ||
Book createdBook = bookDao.create(book); | ||
System.out.println(createdBook); | ||
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Optional<Book> getBookById = bookDao.findById(1L); | ||
System.out.println("Book by id " + getBookById); | ||
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book.setTitle("Updated Book"); | ||
book.setPrice(BigDecimal.valueOf(200)); | ||
Book updatedBook = bookDao.update(book); | ||
System.out.println("Updated Book: " + updatedBook); | ||
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List<Book> getAllBook = bookDao.findAll(); | ||
System.out.println("All Books : " + getAllBook); | ||
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boolean deleteBook = bookDao.deleteById(3L); | ||
System.out.println("Deleted book: " + deleteBook); | ||
} | ||
} |
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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 | ||||||||||||
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@@ -0,0 +1,121 @@ | ||||||||||||||
package mate.academy.dao.impl; | ||||||||||||||
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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.dao.BookDao; | ||||||||||||||
import mate.academy.exception.DataProcessingException; | ||||||||||||||
import mate.academy.lib.Dao; | ||||||||||||||
import mate.academy.model.Book; | ||||||||||||||
import mate.academy.util.db.ConnectionUtil; | ||||||||||||||
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@Dao | ||||||||||||||
public class BookDaoImpl implements BookDao { | ||||||||||||||
private static final String CANT_CREATE = "Can't store the book to the DB"; | ||||||||||||||
private static final String CANT_FIND_BY_ID = "Can't find the book with id = "; | ||||||||||||||
private static final String CANT_FIND_ALL = "Can't find all books"; | ||||||||||||||
private static final String CANT_UPDATE = "Can't update the book with id = "; | ||||||||||||||
private static final String CANT_DELETE = "Can't delete the book with id = "; | ||||||||||||||
private static final String UPDATE_FAILED | ||||||||||||||
= "Expected to update at least 1 row, but 0 was updated."; | ||||||||||||||
private static final String INSERT_FAILED | ||||||||||||||
= "Expected to update at least 1 row, but 0 was updated."; | ||||||||||||||
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@Override | ||||||||||||||
public Book create(Book book) { | ||||||||||||||
String insertQuery = "INSERT INTO books (title,price) VALUES (?,?);"; | ||||||||||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||||||||||
PreparedStatement statement = connection.prepareStatement( | ||||||||||||||
insertQuery, Statement.RETURN_GENERATED_KEYS)) { | ||||||||||||||
statement.setString(1, book.getTitle()); | ||||||||||||||
statement.setBigDecimal(2, book.getPrice()); | ||||||||||||||
statement.executeUpdate(); | ||||||||||||||
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Suggested change
|
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ResultSet generatedKey = statement.getGeneratedKeys(); | ||||||||||||||
if (generatedKey.next()) { | ||||||||||||||
Long id = generatedKey.getObject(1, Long.class); | ||||||||||||||
book.setId(id); | ||||||||||||||
} else { | ||||||||||||||
throw new DataProcessingException(INSERT_FAILED); | ||||||||||||||
} | ||||||||||||||
} catch (SQLException e) { | ||||||||||||||
throw new DataProcessingException(CANT_CREATE, e); | ||||||||||||||
} | ||||||||||||||
return book; | ||||||||||||||
} | ||||||||||||||
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@Override | ||||||||||||||
public Optional<Book> findById(Long id) { | ||||||||||||||
String getByIdQuery = "SELECT * FROM books WHERE id = ? AND is_deleted = FALSE"; | ||||||||||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||||||||||
PreparedStatement statement = connection.prepareStatement(getByIdQuery)) { | ||||||||||||||
statement.setLong(1, id); | ||||||||||||||
ResultSet resultSet = statement.executeQuery(); | ||||||||||||||
if (resultSet.next()) { | ||||||||||||||
return Optional.of(createBook(resultSet)); | ||||||||||||||
} | ||||||||||||||
} catch (SQLException e) { | ||||||||||||||
throw new DataProcessingException(CANT_FIND_BY_ID + id, e); | ||||||||||||||
} | ||||||||||||||
return Optional.empty(); | ||||||||||||||
} | ||||||||||||||
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@Override | ||||||||||||||
public List<Book> findAll() { | ||||||||||||||
String getAllQuery = "SELECT * FROM books WHERE is_deleted = FALSE"; | ||||||||||||||
List<Book> books = new ArrayList<>(); | ||||||||||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||||||||||
PreparedStatement statement = connection.prepareStatement(getAllQuery)) { | ||||||||||||||
ResultSet resultSet = statement.executeQuery(); | ||||||||||||||
while (resultSet.next()) { | ||||||||||||||
books.add(createBook(resultSet)); | ||||||||||||||
} | ||||||||||||||
} catch (SQLException e) { | ||||||||||||||
throw new DataProcessingException(CANT_FIND_ALL, e); | ||||||||||||||
} | ||||||||||||||
return books; | ||||||||||||||
} | ||||||||||||||
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@Override | ||||||||||||||
public Book update(Book book) { | ||||||||||||||
String updateQuery = "UPDATE books SET title = ?, price = ? " | ||||||||||||||
+ "WHERE id = ? AND is_deleted = FALSE"; | ||||||||||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||||||||||
PreparedStatement statement = connection.prepareStatement(updateQuery)) { | ||||||||||||||
statement.setString(1, book.getTitle()); | ||||||||||||||
statement.setBigDecimal(2, book.getPrice()); | ||||||||||||||
statement.setLong(3, book.getId()); | ||||||||||||||
int affectedRows = statement.executeUpdate(); | ||||||||||||||
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Suggested change
|
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if (affectedRows < 1) { | ||||||||||||||
throw new DataProcessingException(UPDATE_FAILED); | ||||||||||||||
} | ||||||||||||||
} catch (SQLException e) { | ||||||||||||||
throw new DataProcessingException(CANT_UPDATE + book.getId(), e); | ||||||||||||||
} | ||||||||||||||
return book; | ||||||||||||||
} | ||||||||||||||
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@Override | ||||||||||||||
public boolean deleteById(Long id) { | ||||||||||||||
String deletedQuery = "UPDATE books SET is_deleted = TRUE WHERE id = ?"; | ||||||||||||||
try (Connection connection = ConnectionUtil.getConnection(); | ||||||||||||||
PreparedStatement statement = connection.prepareStatement(deletedQuery)) { | ||||||||||||||
statement.setLong(1, id); | ||||||||||||||
return statement.executeUpdate() > 0; | ||||||||||||||
} catch (SQLException e) { | ||||||||||||||
throw new DataProcessingException(CANT_DELETE + id, e); | ||||||||||||||
} | ||||||||||||||
} | ||||||||||||||
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private Book createBook(ResultSet resultSet) throws SQLException { | ||||||||||||||
return new Book( | ||||||||||||||
resultSet.getObject("id", Long.class), | ||||||||||||||
resultSet.getObject("title", String.class), | ||||||||||||||
resultSet.getObject("price", BigDecimal.class)); | ||||||||||||||
} | ||||||||||||||
} |
11 changes: 11 additions & 0 deletions
11
src/main/java/mate/academy/exception/DataProcessingException.java
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---|---|---|
@@ -0,0 +1,11 @@ | ||
package mate.academy.exception; | ||
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public class DataProcessingException extends RuntimeException { | ||
public DataProcessingException(String message) { | ||
super(message); | ||
} | ||
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public DataProcessingException(String message, Throwable exception) { | ||
super(message, exception); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -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() { | ||
} | ||
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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 +1,26 @@ | ||
package mate.academy.util.db; | ||
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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/mate"; | ||
private static final Properties DB_PROPERTIES; | ||
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static { | ||
DB_PROPERTIES = new Properties(); | ||
DB_PROPERTIES.put("user", "root"); | ||
DB_PROPERTIES.put("password", "12345678"); | ||
try { | ||
Class.forName("com.mysql.cj.jdbc.Driver"); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException("Can not load JDBC driver", 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 +1,5 @@ | ||
CREATE TABLE books ( | ||
id BIGINT AUTO_INCREMENT PRIMARY KEY, | ||
title VARCHAR(255) NOT NULL, | ||
price DECIMAL(6, 2) NOT NULL, | ||
is_deleted TINYINT NOT NULL DEFAULT 0); |
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