insert into t_paper (userId, courseName, createDate, score, userName) values (#{userId}, #{courseName}, now(), 0, #{userName}); select * from t_paper where userId = #{userId} order by createDate desc limit 1 update t_paper score=#{score}, where id = #{id} select * from t_paper where userId = #{userId} order by id desc select * from t_paper where id = #{id} select * from t_paper and userId = #{userId} and userName like #{userName} order by id desc limit #{start},#{size} select count(*) from t_paper and userId = #{userId} and userName like #{userName}