public String createBorrow(String idUSer, String idBook) {
		
		if(idUSer.equals("") || idBook.equals("")) {
			return "One ore more fields are empty";
		}
		
		if(!IntegerUtil.isInteger(idUSer) || !IntegerUtil.isInteger(idBook)) {
			return "The field's value must be numeric";
		}
		
		int idUserInt = Integer.parseInt(idUSer);
		int idBookInt = Integer.parseInt(idBook);
		
		if(borrowService.createBorrow(idUserInt, idBookInt)) {
			return "Creation succeed";
		} else {
			return "Error the book is not available or wrong ids"; 
		}
	}