mysql資料庫表person_organization中，主鍵是organization_id，另有一列parent_organization_id指向父機構的資料記錄；通過以下sql可以取出指定organization_id所在的樹狀結構枝幹上所有的organization_id：
(
-- 查詢所有子孫organization_id
select organization_id from (
select t1.organization_id,
if (find_in_set(parent_organization_id, @pids) > 0, @pids := concat(@pids, ',', organization_id), 0) as ischild
from
(select organization_id, parent_organization_id from person_organization t where t.status = '0' order by parent_organization_id, organization_id, type) t1,
(select @pids := #) t2
) t3 where ischild != '0'
)uinion
(-- 查詢所有父祖organization_id
select t2.organization_id from (
select @r as _id,
(select @r := parent_organization_id from person_organization
where organization_id = _id) as parent_organization_id, @l := @l + 1 as lvl from
(select @r := #, @l := '') vars, person_organization h where @r ]]> '' and h.status = '0') t1 join person_organization t2 on t1._id = t2.organization_id order by t1.lvl asc
)
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