model danych:
table Book {
int id primary key generated;
string title;
float price;
};
stworzyc aplikacje spring
1 komponent DAO repository
-zapis nowych ksiazek
-odczyt wszystkich
-odczyt z cena w przedziale min max
2 komponent bookservice
delegujacy wywolania do komponentu 1 (dao) i dla metod sprawdzajacych ksiazki dodajacy logike promocji
(book.discount.day w wybrany dzien miesiaca, ksiazki sa tansze o book.discount(x%))<- stale przechowywane w properties
final book.discount.day jakis dzien np 6
if(6) to book.discount(10%)
3 klasa z metoda main ktora demonstruje dzialanie 3 metod komponentu bookservice
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