update如何实现批量修改 where条件不同

// r_line_depot 表中有 orders depot_id line_id字段
// 业务逻辑：将line_id 为123 depot_id为1234的orders修改为1111 ；将line_id 为123 depot_id为1235的orders修改为2222
update r_line_depot set orders = 
case when depot_id= '1234' 
then  '1111' 
when depot_id= '1235'  
then  '2222'
end
where   depot_id in('1234','1235') and line_id = '123'