How to use #ModelAttribute annotation to pass an object to the database? - spring

Question

I am going to use #ModelAttribute instead of #RequestParam to bind the user input and write it to the database. I am just confused when the #ModelAttribute bind the data in my request handler method (#ModelAttribute book Book) as an book object then how should I pass this object to the database? Normally using #RequestParam I bind the user inputs variable by variable according to my model class and then I send them to the db using the related DAO method. I show my classes in below. Can anybody say how my request handler method should look like if I use #ModelAttribute?
Model Class:
#Component
public class Book {
int bookId;
String title;
Author author;
Publisher publisher;
public int getBookId() {
return bookId;
}
public void setBookId(int bookId) {
this.bookId = bookId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Author getAuthor() {
return author;
}
public void setAuthor(Author author) {
this.author = author;
}
public Publisher getPublisher() {
return publisher;
}
public void setPublisher(Publisher publisher) {
this.publisher = publisher;
}
}
DAO:
public class BookDAO extends JdbcDaoSupport {
#Autowired
AuthorDAO authorDAO;
#Autowired
PublisherDAO publisherDAO;
public void addBook(String title, int authorId, int publisherId)
throws ClassNotFoundException, SQLException {
String sql = "insert into tbl_book (title, authId, pubId) values (?, ?, ?)";
this.getJdbcTemplate().update(sql, new Object[]{title, authorId, publisherId});
}
}
Service:
#Service
public class BookService {
#Autowired
BookDAO bookDAO;
public Book getBookById(int bookId) throws ClassNotFoundException,
SQLException {
return bookDAO.getBookById(bookId);
}
public List<Book> getAllBooks() throws ClassNotFoundException,
SQLException {
List<Book> bookList = bookDAO.getAllBooks();
return bookList;
}
public void addBook(String title, int authorId, int publisherId) throws ClassNotFoundException,
SQLException {
bookDAO.addBook(title, authorId, publisherId);
}
}
Controller:
#Controller
public class BookController {
#RequestMapping(value = "/addBookExecution", method = equestMethod.POST)
protected ModelAndView addBookExecution(#RequestParam String title,
#RequestParam int authorId, #RequestParam int blisherId)
throws ClassNotFoundException, SQLException {
bookService.addBook(title, authorId, publisherId);
ModelAndView model = new ModelAndView("adminFunctionsPage");
model.addObject("Msg", "Your request has been processed successfully.");
return model;
}
}

Answer 1

Your form should have parameters names as your book object, check below sample code
<form >
<input type="text" name="authorId"/>
<input type="text" name="authorName"/>
etc...
</form>
Book.java
class Book{
Integer authorId;
String authorName;
etc..
}
#RequestMapping(value = "/addBookExecution", method = equestMethod.POST)
protected ModelAndView addBookExecution(#ModelAttribute Book book)
throws ClassNotFoundException, SQLException {
bookService.addBook(book);
ModelAndView model = new ModelAndView("adminFunctionsPage");
model.addObject("Msg", "Your request has been processed successfully.");
return model;
}