数据库中具有重复值的java Hibernate update语句

Question

在hibernate中使用MYSQL

这是我的更新声明

会议结束了。flush（）和会话。我很担心，但我不知道还有别的办法

sessionFactory由spring自动连接

这是在我的dao实现中

这个代码有什么问题

@Override
@Transactional
public void updateCurrency(CurrencyEntity currencyEntity) {
    session = sessionFactory.getCurrentSession();

    //flush the session sending previously cached SQL statements to the database
    session.flush();
    //clear the session as we don't want to keep previous entities tracked.
    //this avoids the chance of a persistent instance with the same identifier causing problems for the update.
    session.clear();

    session.update(currencyEntity);

    //flush to send the update to the database so any errors are caught immediately
    session.flush();

}