private void turnIn(String toCardno, float money) {

        accountDao.turnIn(toCardno, money);
        //轉入賬戶
        float balance=accountDao.getBalance(toCardno);
        System.out.println("轉入賬戶餘額="+balance);
        Transaction transaction=new Transaction();
        Date date=new Date();
        transaction.setCardno
 
(toCardno);
        transaction.setTransaction_date(date);
        transaction.setExpense(money);
        transaction.setBalance(balance);
        transaction.setTransaction_type("轉入");
        System.out.println("執行插入insertRecord");
        transactionDao.insertRecord(transaction);

    }

出現這個問題

org.springframework.dao.DuplicateKeyException: A different object with the same identifier value was already associated with the session : [entity.Transaction#0]; nested exception is

org.hibernate.NonUniqueObjectException: A different object with the same identifier value was already associated with the session : [entity.Transaction#0]

但是,我在實體類上加上 –紅色的部分

即主鍵的生成策略後就不報錯了

@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE)
@Column(name = “id”)
private int id;