java – MyBatis mapper直接注入服务类.例外呢？

我目前正在使用MyBatis-Spring集成框架,这就是我从docs中读到的内容：

Rather than code data access objects (DAOs) manually using SqlSessionDaoSupport or SqlSessionTemplate,
Mybatis-Spring provides a proxy factory: MapperFactoryBean. This class lets you inject data mapper interfaces
directly into your service beans. When using mappers you simply call them as you have always called your
DAOs,but you won’t need to code any DAO implementation because MyBatis-Spring will create a proxy for
you.

这是一个非常好的功能……但是异常处理呢？我应该在哪里翻译SQL错误？在我的服务层？但它不会违反服务DAO模式吗？

例：

public final class AccountServiceImpl implements AccountService {
(...)
    private AccountMapper accountMapper;
(...)
    @Override
    public void addAccount(Account account) throws AccountServiceException {

       //Validating,processing,setting timestamps etc.
       (...)

       //Persistence:
       int rowsAffected;
       try {
            rowsAffected = accountMapper.insertAccount(account);
       } catch (Exception e) {
            String msg = e.getMessage();
            if (msg.contains("accounts_pkey"))
                throw new AccountServiceException("Username already exists!");
            if (msg.contains("accounts_email_key"))
                throw new AccountServiceException("E-mail already exists!");
            throw new AccountServiceException(APP_ERROR);
       }

       LOG.debug("Rows affected: '{}'",rowsAffected);

       if (rowsAffected != 1)
            throw new AccountServiceException(APP_ERROR);
    }

在服务层中转换异常是否可以？

应该怎么做？

在此先感谢您的建议.