SELECT * FROM music_group_student_fee_ WHERE id_ = #{id} SELECT * FROM music_group_student_fee_ ORDER BY id_ INSERT INTO music_group_student_fee_ (id_,music_group_id_,user_id_,course_fee_,create_time_,update_time_) VALUES(#{id},#{musicGroupId},#{userId},#{courseFee},now(),now()) UPDATE music_group_student_fee_ user_id_ = #{userId}, update_time_ = #{updateTime}, course_fee_ = #{courseFee}, music_group_id_ = #{musicGroupId}, WHERE id_ = #{id} DELETE FROM music_group_student_fee_ WHERE id_ = #{id} SELECT * FROM music_group_student_fee_ ORDER BY id_ SELECT COUNT(*) FROM music_group_student_fee_