SELECT * FROM sys_music_score_change_log WHERE id_ = #{id} SELECT * FROM sys_music_score_change_log ORDER BY id_ INSERT INTO sys_music_score_change_log (sys_music_score_id_,change_before_,change_after_,create_time_) VALUES(#{sysMusicScoreId},#{changeBefore},#{changeAfter},now()) UPDATE sys_music_score_change_log sys_music_score_id_ = #{sysMusicScoreId}, change_before_ = #{changeBefore}, change_after_ = #{changeAfter}, WHERE id_ = #{id} delete from sys_music_score_change_log WHERE id_ = #{id} SELECT t.* FROM sys_music_score_change_log t SELECT count(1) FROM sys_music_score_change_log t