#FETCH_STATUS as a Variable - sql-server

Question

I have a problem regarding using a stored procedure to build a view for a database. The stored procedure will use a cursor to cycle through child databases that are in a parent database (I have a company database, that holds facility database names in it). The stored procedure will get the facilities and then append the table to those databases.
For example:
OPEN cur_facdb
FETCH NEXT FROM cur_facdb INTO #fac_dw_db_name
WHILE ##FETCH_STATUS = 0
BEGIN
SET #sql_command = "CREATE VIEW dbo.BMK_LOCAL_FACILITY_VW
AS
SELECT *
FROM " + #fac_dw_db_name + " .dbo.BMK_FACILITY"
FETCH NEXT FROM cur_facdb INTO #fac_dw_db_name
END
CLOSE cur_facdb
DEALLOCATE cur_facdb
This right now will get me a list of 5 or 6 facilities that look like this:
SELECT * FROM facility_aaaa.dbo.BMK_FACILITY
SELECT * FROM facility_aaab.dbo.BMK_FACILITY
SELECT * FROM facility_aaac.dbo.BMK_FACILITY
Etc....
The problem is that I need to append at the end of each select statement UNION ALL, of course, all but the last record that is produced.
Now having said all of that, is there a way to dump the #FETCH_STATUS into a variable, and then append it to the statement like so:
SET #sql_command = "CREATE VIEW dbo.BMK_LOCAL_FACILITY_VW AS
SELECT * FROM " + #fac_dw_db_name + " .dbo.BMK_FACILITY
*CASE WHEN #Fetch_Variable = 0 THEN 'UNION ALL' ELSE '' END*
"
The reason I can't build a standard view and hard code the facilities is because facilities can be dropped and added monthly, so I am trying to dynamically create this view every month.
Thanks for taking a look.

Answer 1

Put the union all at the beginning, then stuff() the create view in place of the first union all. Like this:
declare #tbl table (name varchar(100))
insert into #tbl values ('facility_aaaa'),('facility_aaab'),('facility_aaac')
declare #sql varchar(max), #t varchar(100), #crlf char(2) = char(13) + char(10)
declare cr cursor local for
select name
from #tbl
order by name
set #sql = ''
open cr
fetch next from cr into #t
while ##fetch_status = 0
begin
set #sql = #sql + 'union all' + #crlf + 'select * from ' + #t + '.dbo.BMK_FACILITY' + #crlf
fetch next from cr into #t
end
close cr
deallocate cr
set #sql = stuff(#sql, 1, 9, 'create view dbo.BMK_LOCAL_FACILITY_VW AS')
print #sql
Which prints this:
create view dbo.BMK_LOCAL_FACILITY_VW AS
select * from facility_aaaa.dbo.BMK_FACILITY
union all
select * from facility_aaab.dbo.BMK_FACILITY
union all
select * from facility_aaac.dbo.BMK_FACILITY
Alternatively, you can accomplish the same thing and use a case statement to add union all to all but the last record. Add a new column to your cursor query rn = row_number() over (order by name desc) and then reverse sort it order by rn desc. You get a descending integer, where rn will equal 1 on the last record. Like this:
declare #tbl table (name varchar(100))
insert into #tbl values ('facility_aaaa'),('facility_aaab'),('facility_aaac')
declare #sql varchar(max), #t varchar(100), #crlf char(2) = char(13) + char(10), #rn int
declare cr cursor local for
select name, rn = row_number() over (order by name desc)
from #tbl
order by rn desc
set #sql = 'create view dbo.BMK_LOCAL_FACILITY_VW AS' + #crlf
open cr
fetch next from cr into #t, #rn
while ##fetch_status = 0
begin
set #sql = #sql + 'select * from ' + #t + '.dbo.BMK_FACILITY' + #crlf + case when #rn > 1 then 'union all' + #crlf else '' end
fetch next from cr into #t, #rn
end
close cr
deallocate cr
print #sql