Getting AutoIncrement value after saving in Spring - mysql

Question

I'm working with Spring Boot 2 (Hibernate, JPA) and MySQL. I need a unique, auto increment custom reference number, for example 18/10/5 (here, 18 is year, 10 is month, 5 is auto increment field). The strategy I used is:
Create an auto increment field. Get the value of auto increment after saving and joining with yy/MM/.
I removed unwanted annotations for easiness.
Model class
#Entity
#Table(name="account")
public class Account{
#Id
private String id;
#GeneratedValue(strategy=GenerationType.AUTO)
private Long autoIncrement;
String refNo;
//Other fields, Constructors, Getters And Setters
}
Then in the controller, first I save, then I get the id of the saved object and trying to update
Controller class
#RestController
#RequestMapping("/account")
public class AccountController {
#PostMapping("/save")
public ModelAndView saveAccount(#ModelAttribute("account") Account account){
//few codes
accountService.save(account) //Saving
accountService.updateRefNo(account.getId()) //try to update
}
}
Service class
#Service
#Transactional
public class AccountServiceImpl implements AccountService{
#Autowired
AccountRepository accountRepository;
//Few methods
public void updateRefNo(String id) {
Account account=findById(id); // return the object
String year = // getting year
String month = //getting month
account.setRefNo(year+"/"+month+"/"+account.getAutoIncrement());
}
}
Data is saved. When I try to update, account.getAutoIncrement() returns null, but its saved in the database. I tried saveAndFlush() also. Why does this happen? Not committed?

Answer 1

in your updateRefNo I dont see save or update call on Account entity
public void updateRefNo(String id) {
Account account=findById(id); // return the object
String year = // getting year
String month = //getting month
account.setRefNo(year+"/"+month+"/"+account.getAutoIncrement());
// update in DB
accountRepository.save(account); or accountRepository.update(account);
}