select * from university_major and p_id = #{pId} and major like #{major} select count(0) from university_major and p_id = #{pId} and major like #{major} and major_code like #{majorCode} insert into university_major (major,major_code,p_id) values (#{major},#{majorCode},#{pId}) delete university_major where id = #{id} update university_major major=#{major}, major_code=#{majorCode}, where id = #{id}