MybatisPlus获取Map「自定义键,对象」数据

1、调用

//String :openId ;
Map<String , ActivityUser> mapActivityUser = ();

2、service

/**
  * 获取ActivityUser Map
  * @return
  */
Map<String, ActivityUser> getActivityUserMap();

3、serviceImpl

    @Resource
    private ActivityUserMapper activityUserMapper;

    @Override
    public Map<String, ActivityUser> getActivityUserMap() {
        return ();
    }

4、mapper

    @MapKey("openId")
    @Select("select open_id as openId,phone,address,name from activity_user")
    Map<String, ActivityUser> getActivityUserMap();