java - 捕获重复条目异常

Question

我怎样才能捕捉到这个异常:

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: 
                                      Duplicate entry '22-85' for key 'ID_CONTACT'

Answer 1

我用的是spring，所以我们通过org.springframework.dao.DataIntegrityViolationException

来解决

try {
    ao_history_repository.save(new AoHistory(..));
} catch (DataIntegrityViolationException e) {
    System.out.println("history already exist");
}

但是作为 @KevinGuancheDarias提一下:

Please note that while this works. I suggest to solve the problem by issuing a findBy before the save, as this is messy, and I think it's not warranted that it will work in future versions, may even break without notification.