flyin69
asked on
SQL SERVER 2000 Recursive Stored Procedure
Hello All,
Here is the scenario.
Name CategoryID ParentID
Politics 1 0
Repub. 2 1
Bush 3 2
Democrat 4 1
Clinton 5 4
Cars 6 0
Chevy 7 6
Vette 8 7
It's your basic Parent-Child relationship.
Politics is the the Parent to Republican and Democrat.
Republican is the parent to Bush
Democrat is the parent to Clinton.
well, I need a stored procedure that, with a given CategoryID, it will return me back a string
representing all of the children that belong to that specified categoryID in one field, in the form of something like,
if i specify Republican with a CategoryID=2 then:
Republican:2||Bush:3
if i specify Politics with a CategoryID=1 i would get returned:
Politics:1||Republican:2||
One more twist to this would be that if i didn't specify a Category To Search Under,
It would return me back A Row for each Root Category with representation for the Child cateogories for that root. Like for instance,
If Category passed In = 0 then,
return back as many rows as there are root categories, so for the above example would return:
Politics:1||Republican:2||
Cars:6||Chevy:7||Vette:8
I really don't mind of it's in a ad-hoc query to be put inside of a view, but a stored procedure would suit this type of query best. Thanks ahead of time for the advice.
Flyin
Here is the scenario.
Name CategoryID ParentID
Politics 1 0
Repub. 2 1
Bush 3 2
Democrat 4 1
Clinton 5 4
Cars 6 0
Chevy 7 6
Vette 8 7
It's your basic Parent-Child relationship.
Politics is the the Parent to Republican and Democrat.
Republican is the parent to Bush
Democrat is the parent to Clinton.
well, I need a stored procedure that, with a given CategoryID, it will return me back a string
representing all of the children that belong to that specified categoryID in one field, in the form of something like,
if i specify Republican with a CategoryID=2 then:
Republican:2||Bush:3
if i specify Politics with a CategoryID=1 i would get returned:
Politics:1||Republican:2||
One more twist to this would be that if i didn't specify a Category To Search Under,
It would return me back A Row for each Root Category with representation for the Child cateogories for that root. Like for instance,
If Category passed In = 0 then,
return back as many rows as there are root categories, so for the above example would return:
Politics:1||Republican:2||
Cars:6||Chevy:7||Vette:8
I really don't mind of it's in a ad-hoc query to be put inside of a view, but a stored procedure would suit this type of query best. Thanks ahead of time for the advice.
Flyin
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ASKER
Amazing, thanks VC, that's exaclty what i was looking for!
I 've been looking for about 2 months now and finally on this site have seen the answer i was looking for. thanks again.
Flyin
I 've been looking for about 2 months now and finally on this site have seen the answer i was looking for. thanks again.
Flyin
>>Amazing, thanks VC, that's exaclty what i was looking for!<<
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ASKER
Thank you Ace
This is cleaner and probably faster:
create PROCEDURE ps_AllChildrenOfEmployee
@categoryid int
AS
set nocount on
declare @rowcount int
,@qry varchar(1000)
,@template varchar(200)
--template that we will use to continue to nest sql statements
set @template = 'select categoryid from tblcategories where parentid in ( {0} )'
--used to store the query we will run each iteration
set @qry = 'select categoryid from tblcategories where parentid = ' + cast(@categoryid as varchar(5))
--we will get a list of all subordinates under this employee, no matter how deep
create table #temp(categoryid int)
--add themselves to the list of employees if you want
insert into #temp values(@categoryid)
--set rowcount to 1 so we can enter the loop
set @rowcount = 1
while @rowcount > 0
begin
--exec the last qry string. the first time through will run the default above
exec ( 'insert into #temp ' + @qry )
--get the # of records inserted. if zero, then we want to exit the loop
set @rowcount = @@rowcount
--take this qry and nest it one more level deep so we get the next level down of employees
set @qry = replace(@template,'{0}',@q
end
drop table #temp
create PROCEDURE ps_AllChildrenOfEmployee
@categoryid int
AS
set nocount on
declare @rowcount int
,@qry varchar(1000)
,@template varchar(200)
--template that we will use to continue to nest sql statements
set @template = 'select categoryid from tblcategories where parentid in ( {0} )'
--used to store the query we will run each iteration
set @qry = 'select categoryid from tblcategories where parentid = ' + cast(@categoryid as varchar(5))
--we will get a list of all subordinates under this employee, no matter how deep
create table #temp(categoryid int)
--add themselves to the list of employees if you want
insert into #temp values(@categoryid)
--set rowcount to 1 so we can enter the loop
set @rowcount = 1
while @rowcount > 0
begin
--exec the last qry string. the first time through will run the default above
exec ( 'insert into #temp ' + @qry )
--get the # of records inserted. if zero, then we want to exit the loop
set @rowcount = @@rowcount
--take this qry and nest it one more level deep so we get the next level down of employees
set @qry = replace(@template,'{0}',@q
end
drop table #temp
sorry, change all comments of "employee" to "category"
ASKER
wow thank you scottelkin, i will try that out. Yes it does look much cleaner! I'll get back to you on how successful i was!
ASKER
Flyin