select id, name, course_id, chapter_id, status,sort,company_id,resource_id,version, create_by, create_time, update_by, update_time, remark from ex_course_chapter_period delete from ex_course_chapter_period where chapter_id=#{chapterId} where id =#{periodId} select id,name from ex_course_chapter_period where name=#{name} and course_id=#{courseId} and chapter_id=#{chapterId} limit 1 select * from ex_course_chapter_period where chapter_id=#{chapterId}