select aud.userid as `userId`,case when length(aud.realname)>0 then aud.realname else aud.nickname end as `name`,aul.username as `phone` from `app_user_detail` as aud left join `app_user_login` as aul on aul.id=aud.userid
<where>
<iftest="userIds != null and userIds.size() != 0">