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created connection to DB and implemented DAO methods #374
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Original file line number | Diff line number | Diff line change |
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@@ -1,7 +1,65 @@ | ||
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"); | ||
private static Book bookBeauty = new Book(); | ||
private static final Book bookPeace = new Book(); | ||
private static final Book bookFun = new Book(); | ||
private static BookDao bookDao; | ||
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static { | ||
bookBeauty.setTitle("Beauty"); | ||
bookBeauty.setPrice(BigDecimal.valueOf(20.99)); | ||
bookPeace.setTitle("Peace"); | ||
bookPeace.setPrice(BigDecimal.valueOf(100.00)); | ||
bookFun.setTitle("Fun"); | ||
bookFun.setPrice(BigDecimal.valueOf(15.80)); | ||
} | ||
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public static void main(String[] args) { | ||
bookDao = (BookDao) injector.getInstance(BookDao.class); | ||
Book bookBeautyWithId = createBook(bookBeauty); | ||
System.out.println("Added new book to DB: " + bookBeautyWithId); | ||
System.out.println("Added new book to DB: " + createBook(bookPeace)); | ||
System.out.println("Added new book to DB: " + createBook(bookFun)); | ||
Long bookBeautyId = bookBeautyWithId.getId(); | ||
Optional<Book> bookById = bookDao.findById(bookBeautyId); | ||
System.out.println("Found book by id: " + bookBeautyId | ||
+ ". The book is: " + bookById); | ||
List<Book> allBooks = bookDao.findAll(); | ||
System.out.println("List of all books: "); | ||
outputAllBooksList(allBooks); | ||
bookBeautyWithId.setPrice(BigDecimal.valueOf(25.00)); | ||
bookBeautyWithId.setTitle("BEAUTY"); | ||
bookDao.update(bookBeautyWithId); | ||
System.out.println("Before updating, title: Beauty; price: 20.99. " | ||
+ "After updating should be: title: BEAUTY, price: 25.00. " | ||
+ System.lineSeparator() + "Updated book is: " | ||
+ bookDao.findById(bookBeautyId)); | ||
Long bookFunId = bookFun.getId(); | ||
bookDao.deleteById(bookFunId); | ||
System.out.println("Deleted book with title \"Fun\", id: " + bookFunId); | ||
List<Book> booksAfterDelete = bookDao.findAll(); | ||
System.out.println("List of all books after delete: "); | ||
outputAllBooksList(booksAfterDelete); | ||
} | ||
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private static Book createBook(Book book) { | ||
return bookDao.create(bookBeauty); | ||
} | ||
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private static void outputAllBooksList(List<Book> books) { | ||
if (!books.isEmpty()) { | ||
for (Book book : books) { | ||
System.out.println(book); | ||
} | ||
} | ||
} | ||
} |
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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 +1,116 @@ | ||
package mate.academy.dao; | ||
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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.service.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.create(); | ||
PreparedStatement statement | ||
= connection.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setObject(2, book.getPrice()); | ||
int affectedRows = statement.executeUpdate(); | ||
checkNumberOfAffectedRows(affectedRows); | ||
ResultSet generatedKeys = statement.getGeneratedKeys(); | ||
if (generatedKeys.next()) { | ||
Long id = generatedKeys.getObject(1, Long.class); | ||
book.setId(id); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't create new book in DB: " | ||
+ 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.create(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
statement.setLong(1, id); | ||
ResultSet resultSet = statement.executeQuery(); | ||
if (resultSet.next()) { | ||
return Optional.of(mapResultSetToBook(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() { | ||
String sql = "SELECT * FROM books"; | ||
List<Book> allBooks = new ArrayList<>(); | ||
try (Connection connection = ConnectionUtil.create(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
ResultSet resultSet = statement.executeQuery(); | ||
while (resultSet.next()) { | ||
allBooks.add(mapResultSetToBook(resultSet)); | ||
} | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't create List of all books in DB; ", e); | ||
} | ||
return allBooks; | ||
} | ||
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@Override | ||
public Book update(Book book) { | ||
String sql = "UPDATE books SET title = ?, price = ? WHERE id = ?"; | ||
try (Connection connection = ConnectionUtil.create(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
statement.setString(1, book.getTitle()); | ||
statement.setBigDecimal(2, book.getPrice()); | ||
statement.setLong(3, book.getId()); | ||
int affectedRows = statement.executeUpdate(); | ||
checkNumberOfAffectedRows(affectedRows); | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't update info about 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.create(); | ||
PreparedStatement statement = connection.prepareStatement(sql)) { | ||
statement.setLong(1, id); | ||
int affectedRows = statement.executeUpdate(); | ||
return affectedRows > 0; | ||
} catch (SQLException e) { | ||
throw new DataProcessingException("Can't delete book with id = " | ||
+ id, e); | ||
} | ||
} | ||
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private Book mapResultSetToBook(ResultSet resultSet) throws SQLException { | ||
Book book = new Book(); | ||
book.setId(resultSet.getObject("id", Long.class)); | ||
book.setTitle(resultSet.getString("title")); | ||
book.setPrice(resultSet.getBigDecimal("price")); | ||
return book; | ||
} | ||
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private void checkNumberOfAffectedRows(int affectedRows) { | ||
if (affectedRows < 1) { | ||
throw new RuntimeException("Expected to modify at least 1 row, but modified 0 rows."); | ||
} | ||
} | ||
} |
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 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 +1,29 @@ | ||
package mate.academy.service; | ||
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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_USER_NAME = "root"; | ||
private static final String DB_PASSWORD = "getdataSQLjul"; | ||
private static final String DB_URL = "jdbc:mysql://localhost:3306/shop"; | ||
private static final String MYSQL_CLASS = "com.mysql.cj.jdbc.Driver"; | ||
private static final Properties DB_Properties; | ||
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static { | ||
DB_Properties = new Properties(); | ||
DB_Properties.put("user", DB_USER_NAME); | ||
DB_Properties.put("password", DB_PASSWORD); | ||
try { | ||
Class.forName(MYSQL_CLASS); | ||
} catch (ClassNotFoundException e) { | ||
throw new RuntimeException("Cannot load MySQL JDBC driver class", e); | ||
} | ||
} | ||
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public static Connection create() 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 +1,6 @@ | ||
CREATE TABLE books ( | ||
id BIGINT AUTO_INCREMENT, | ||
title VARCHAR(255), | ||
price DECIMAL(10, 2) NOT NULL, | ||
PRIMARY KEY (id) | ||
); |
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It's more efficient to use Stetament instead of PreparedStatement if there are no ?-parameters