mybatis级联查询传参（map保存多参数传参）

 Map map = new HashMap();
long userId = 1;
long  paperId = 1;
map.put("userId", userId);
map.put("paperId",paperId);
session.update(
"com.mukitech.anji.bean.UserPaperMapper.updateStatus", map);
session.commit();

map保存传入参数，传入参数名为key，值为value

 
    update user_paper set status=1 where user_id=#{userId} and paper_id = #{paperId}   
 

user，papers，user_paper为中间表，与user_id和paper_id主键关联

带子条件的内联查询

  select * from papers p  join user_paper up on p.paper_id = up.paper_id 
  join users u on u.user_id=up.user_id where u.user_id = #{userId} and up.status=0