select * from student where 1 = 1 AND class_id = #{classId} AND grade_id = #{gradeId} AND name like concat('%', #{name}, '%') and is_deleted = 0 order by start_time desc LIMIT #{startIndex}, #{pageSize} select count(1) from student select * from student where id = #{id} select * from student where id in #{id} insert into student (name, class_id, grade_id, is_deleted, start_time) values (#{name}, #{classId}, #{gradeId}, 0, #{startTime}) update student set is_deleted = 1 where id = #{id} select count(1) from student where class_id = #{classId} and is_deleted = 0