Loop through all the rows of a temp table and call a stored procedure for each row - sql

Question

I have declared a temp table to hold all the required values as follows:
DECLARE #temp TABLE
(
Password INT,
IdTran INT,
Kind VARCHAR(16)
)
INSERT INTO #temp
SELECT s.Password, s.IdTran, 'test'
from signal s inner join vefify v
on s.Password = v.Password
and s.IdTran = v.IdTran
and v.type = 'DEV'
where s.[Type] = 'start'
AND NOT EXISTS (SELECT * FROM signal s2
WHERE s.Password = s2.Password
and s.IdTran = s2.IdTran
and s2.[Type] = 'progress' )
INSERT INTO #temp
SELECT s.Password, s.IdTran, 'test'
FROM signal s inner join vefify v
on s.Password = v.Password
and s.IdTran = v.IdTran
and v.type = 'PROD'
where s.[Type] = 'progress'
AND NOT EXISTS (SELECT * FROM signal s2
WHERE s.Password = s2.Password
and s.IdTran = s2.IdTran
and s2.[Type] = 'finish' )
Now i need to loop through the rows in the #temp table and and for each row call a sp that takes all the parameters of #temp table as input.
How can I achieve this?

Answer 1

you could use a cursor:
DECLARE #id int
DECLARE #pass varchar(100)
DECLARE cur CURSOR FOR SELECT Id, Password FROM #temp
OPEN cur
FETCH NEXT FROM cur INTO #id, #pass
WHILE ##FETCH_STATUS = 0 BEGIN
EXEC mysp #id, #pass ... -- call your sp here
FETCH NEXT FROM cur INTO #id, #pass
END
CLOSE cur
DEALLOCATE cur

Answer 2

Try returning the dataset from your stored procedure to your datatable in C# or VB.Net. Then the large amount of data in your datatable can be copied to your destination table using a Bulk Copy. I have used BulkCopy for loading large datatables with thousands of rows, into Sql tables with great success in terms of performance.
You may want to experiment with BulkCopy in your C# or VB.Net code.

Answer 3

something like this?
DECLARE maxval, val, #ind INT;
SELECT MAX(ID) as maxval FROM table;
while (ind <= maxval ) DO
select `value` as val from `table` where `ID`=ind;
CALL fn(val);
SET ind = ind+1;
end while;

Answer 4

You can do something like this
Declare #min int=0, #max int =0 --Initialize variable here which will be use in loop
Declare #Recordid int,#TO nvarchar(30),#Subject nvarchar(250),#Body nvarchar(max) --Initialize variable here which are useful for your
select ROW_NUMBER() OVER(ORDER BY [Recordid] ) AS Rownumber, Recordid, [To], [Subject], [Body], [Flag]
into #temp_Mail_Mstr FROM Mail_Mstr where Flag='1' --select your condition with row number & get into a temp table
set #min = (select MIN(Rownumber) from #temp_Mail_Mstr); --Get minimum row number from temp table
set #max = (select Max(Rownumber) from #temp_Mail_Mstr); --Get maximum row number from temp table
while(#min <= #max)
BEGIN
select #Recordid=Recordid, #To=[To], #Subject=[Subject], #Body=Body from #temp_Mail_Mstr where Rownumber=#min
-- You can use your variables (like #Recordid,#To,#Subject,#Body) here
-- Do your work here
set #min=#min+1 --Increment of current row number
END

Answer 5

You always don't need a cursor for this. You can do it with a while loop. You should avoid cursors whenever possible. While loop is faster than cursors.