Java如何優雅的實現微信登入註冊

@Service
public class CsInfoServiceImpl implements CsInfoService {
    @Autowired
    private CsInfoRepository csInfoRepository;

    @Autowired
    private CsWxInfoRepository csWxInfoRepository;

    @Autowired
    private CsInfoConvert csInfoConvert;
    
    @Override
    @Transactional(rollbackFor = Throwable.class, timeout = 60)
    public CsWxInfoDTO register(CsInfoRegisterDTO param) {
        // 根據手機號查詢使用者資訊
        CsInfo info = csInfoRepository.infoByMobile(param.getMobile());
        Long id = info == null ? 0 : info.getId();
        // 如果使用者不存在，則建立
        if(id == 0){
            id = csInfoRepository.create(param.getMobile(), param.getRegisterSource().getCode());
        }
        // 邏輯刪除當前手機號繫結的openid
        // 邏輯刪除當前openid繫結的手機號
        csWxInfoRepository.handleOpenidMobileUnique(param.getMobile(), param.getOpenid(), param.getAppId());
        
        // 保證當前手機號和openid在系統中1:1的關係
        CsWxInfo wxInfo = csWxInfoRepository.infoByMobileOpenid(param.getMobile(), param.getOpenid(), param.getAppId());
        if(wxInfo == null){
            wxInfo = new CsWxInfo();
            wxInfo.setAppId(param.getAppId());
            wxInfo.setMobile(param.getMobile());
            wxInfo.setOpenid(param.getOpenid());
            wxInfo.setUnionid(param.getUnionid());
            wxInfo.setAvatarUrl(param.getAvatarUrl());
            wxInfo.setNickName(param.getNickName());
            csWxInfoRepository.save(wxInfo);
        }else{
            CsWxInfo model = new CsWxInfo();
            model.setId(wxInfo.getId());
            model.setDelFlg(Integer.valueOf(DelFlgEnum.NORMAL.getCode()));
            csWxInfoRepository.updateById(model);
        }

        CsWxInfoDTO result = csInfoConvert.getCsWxInfoDTO(wxInfo);
        result.setInfoId(id);
        return result;
    }
}  

    <update id="loginDelByOpenIdExcludeMobile">
        update cs_wx_info set del_flg = 0 ,update_time = now()
        <where>
            del_flg = 1
            <if test="appId != null">
                and app_id = #{appId}
            </if>
            <if test="openid != null and openid != ''">
                and openid = #{openid}
            </if>
            <if test="mobile != null and mobile != ''">
                and mobile != #{mobile}
            </if>
        </where>
    </update>

    <update id="loginDelByMobileExcludeOpenid">
        update cs_wx_info set del_flg = 0 ,update_time = now()
        <where>
            del_flg = 1
            <if test="appId != null">
                and app_id = #{appId}
            </if>
            <if test="mobile != null and mobile != ''">
                and mobile = #{mobile}
            </if>
            <if test="openid != null and openid != ''">
                and openid != #{openid}
            </if>
        </where>
    </update>