insert into t_followers (followers,by_followers,`time` ) values (#{followers},#{byFollowers},#{time}); delete from t_followers where attention_id=#{attentionId} select user_id, username, email from t_user where user_id in ( select by_followers from t_followers where followers=#{followers} ) select user_id, username, email from t_user where user_id in ( select by_followers from t_followers where followers=#{followers} and by_followers=#{byFollowers} ) delete from t_followers where followers=#{followers} and by_followers=#{byFollowers}