graduation
id,
school_name,`position`,`describe`,create_time,update_time
#{schoolName},#{position},#{describe},now(),now()
school_name =#{schoolName},
`position` =#{position},
`describe` =#{describe},
update_time =now()
and school_name =#{schoolName},
and `position` =#{position},
and `describe` =#{describe},
and create_time >= #{createTime}
and #{updateTime} >= update_time
UPDATE
id = #{id}