mssql多級查詢 CTE遞迴

最近做乙個製造業專案中涉及到打包問題，其模式為： 乙個a->b->c->...可以無限打包，a包含b，b包含c等。

之間遇到了：

1、打包後包裹數量需要更新，更新時必須對他的父級包號也進行更新，所以必須查詢出某個包號對應的所有父級包號；

2、拆包（將包裹拆除，希望把a下面的包裹號也連同一起拆除，這樣必須查詢出某個包號對應的所有子級包號。

後面解決方案：

--建立簡單測試打包表

create table t_pack
( id int identity(1,1) primary key,
packno varchar(40) not null,
parentpackno varchar(40) null,
packquantity int
)

insert into t_pack(packno, parentpackno,packquantity) values('pack_001',null,1)

insert into t_pack(packno, parentpackno,packquantity) values('pack_002',null,1)
insert into t_pack(packno, parentpackno,packquantity) values('pack_003',null,5)
insert into t_pack(packno, parentpackno,packquantity) values('pack_004','pack_003',1)
insert into t_pack(packno, parentpackno,packquantity) values('pack_005','pack_003',4)
insert into t_pack(packno, parentpackno,packquantity) values('pack_006','pack_005',2)
insert into t_pack(packno, parentpackno,packquantity) values('pack_007','pack_005',2)
insert into t_pack(packno, parentpackno,packquantity) values('pack_009',null, 7)
insert into t_pack(packno, parentpackno,packquantity) values('pack_010', null,4)

查詢所有的父級包號及本身：

with ctegetparent as  

( select * from t_pack where packno=@packno --傳入包號'pack_007'
union all 
(select a.* from t_pack as a inner join 
ctegetparent as b on a.packno=b.parentpackno 
) select * from ctegetparent

查詢所有的子級包號及本身：

with area as( 

select * from t_pack where packno=@packno --傳入包號'pack_003'
union all 
select a.* from t_pack a join area b on a.parentpackno=b.packno 
)select * from area

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