小编dim*_*mas的帖子

我需要你帮助解决一个问题.我在DAO类中有这样的方法来保存角色:

@Repository(value="jdbcRoleDAO")
@Transactional(propagation=Propagation.SUPPORTS, readOnly=true, rollbackFor=Exception.class)
public class JdbcRoleDAO implements RoleDAO {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Autowired
    private DBLogger<Role> dbLogger;

    /**
     * @throws DublicateEntryException if object with specified unique for application field already 
     *              exists in DB.
     */
    @CacheEvict(value = "roles", allEntries = true)
    @Transactional(propagation=Propagation.REQUIRED, readOnly=false, rollbackFor=Exception.class)
    @Override
    public Role save(final Role role) {

        if (this.getRoleByName(role.getName()) != null) {
            throw new DublicateEntryException("Record with specified role name already exists in application.");
        }

        KeyHolder keyHolder = new GeneratedKeyHolder();
        jdbcTemplate.update(new PreparedStatementCreator() {

            @Override
            public …