mysql遞迴查詢函式

-- 獲取祖先區劃列表

create
definer
=`root`
@`%`
function
`getparentlist`
(`rootid`
varchar
(10000))
returns
varchar
(10000
)charset utf8
deterministic
begin
declare sparentlist varchar
(10000);
-- 父區劃集（上面所有層的父區劃合集）
declare sparenttemp varchar
(10000);
-- 區劃快取
-- 查出上一層層父區劃賦值給區劃快取
select group_concat(parentid)
into sparenttemp from t_sys_region where areaid = rootid;
-- 如果區劃快取不為空
while sparenttemp is
notnull
do-- 為父區劃集賦值（如果父區劃集不為空則在前面加上區劃快取，否則賦值區劃快取）
if(sparentlist is
notnull
)then
set sparentlist = concat(sparenttemp,
',',sparentlist)
;else
set sparentlist = sparenttemp;
endif
;-- 在當前n層父區劃的基礎上查出上n+1層的父區劃賦值給區劃快取
select group_concat(parentid)
into sparenttemp from t_sys_region where find_in_set(areaid,sparenttemp)
>0;
endwhile
;return sparentlist;
end

-- 獲取所有後代區劃列表

create
definer
=`root`
@`%`
function
`getchildrelist`
(`rootid`
varchar
(10000))
returns
varchar
(10000
)charset utf8
deterministic
begin
declare schildrenlist varchar
(10000);
-- 子區劃集（下面所有層的子區劃合集）
declare schildrentemp varchar
(10000);
-- 區劃快取
-- 查出下一層子區劃賦值區劃快取
select group_concat(areaid)
into schildrentemp from t_sys_region where parentid = rootid;
-- 如果區劃快取不為空
while schildrentemp is
notnull
do-- 為子區劃集賦值（如果子區劃集不為空則在前面加上區劃快取，否則賦值區劃快取）
if(schildrenlist is
notnull
)then
set schildrenlist = concat(schildrentemp,
',', schildrenlist)
;else
set schildrenlist = concat(schildrentemp)
;endif;
-- 在當前n層子區劃的基礎上查出下n+1層的子區劃賦值給區劃快取
select group_concat(areaid)
into schildrentemp from t_sys_region where find_in_set(parentid, schildrentemp)
>0;
endwhile
;return schildrenlist;
end

-- 查出上線下樹區劃列表

create
definer
=`root`
@`%`
function
`getareaids`
(`rootid`
varchar
(10000))
returns
varchar
(10000
)charset utf8
deterministic
begin
declare areaids varchar
(10000);
select concat_ws(
',',getparentlist(rootid)
,rootid,getchildrelist(rootid)
)into areaids;
return areaids;
end

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