spring悲观锁定

http://www.amicabile.com/hybernate/hybernate-
chapter5.html

http://javacompleteexamples.blogspot.com/2009/07/how-db-locking-system-works-
in.html

编辑：

尝试：

@Override@Loggable(value = LogLevel.TRACE)@Transactionalpublic void updateBalance(String id, BigDecimal amount) {        Account acc = (Account) sessionFactory.getCurrentSession().get(Account.class, id, LockMode.UPGRADE);        acc.setBalance(acc.getBalance().subtract(amount));        save(acc);}