John John - 1 month ago 5
SQL Question

T-SQL: Looping through an array of known values

Here's my scenario:

Let's say I have a stored procedure in which I need to call another stored procedure on a set of specific ids; is there a way to do this?

i.e. instead of needing to do this:

exec p_MyInnerProcedure 4
exec p_MyInnerProcedure 7
exec p_MyInnerProcedure 12
exec p_MyInnerProcedure 22
exec p_MyInnerProcedure 19


Doing something like this:

*magic where I specify my list contains 4,7,12,22,19*

DECLARE my_cursor CURSOR FAST_FORWARD FOR
*magic select*

OPEN my_cursor
FETCH NEXT FROM my_cursor INTO @MyId
WHILE @@FETCH_STATUS = 0
BEGIN

exec p_MyInnerProcedure @MyId

FETCH NEXT FROM my_cursor INTO @MyId
END


My Main goal here is simply maintainability (easy to remove/add id's as the business changes), being able to list out all Id's on a single line... Performance shouldn't be as big of an issue

Answer
declare @ids table(idx int identity(1,1), id int)

insert into @ids (id)
    select 4 union
    select 7 union
    select 12 union
    select 22 union
    select 19

declare @i int
declare @cnt int

select @i = min(idx) - 1, @cnt = max(idx) from @ids

while @i < @cnt
begin
     select @i = @i + 1

     declare @id = select id from @ids where idx = @i

     exec p_MyInnerProcedure @id
end