SELECT * FROM music_theory WHERE id_ = #{id} SELECT * FROM music_theory ORDER BY id_ INSERT INTO music_theory (id_,level_,fee_,tenant_id_,create_time_,update_time_) VALUES(#{id},#{level},#{fee},#{tenantId},NOW(),NOW()) UPDATE music_theory id_ = #{id}, fee_ = #{fee}, tenant_id_ = #{tenantId}, level_ = #{level}, update_time_ = NOW() WHERE id_ = #{id} DELETE FROM music_theory WHERE id_ = #{id} SELECT * FROM music_theory ORDER BY id_ SELECT COUNT(*) FROM music_theory