Question

I have a user defined type as below:

CREATE TYPE [Integer_udt] AS  TABLE (
    [Id] INT NOT NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC));

Then I have populated it from a query:

DECLARE @Ids [Integer_udt]
    INSERT INTO @Ids
        SELECT table1.Id 
        FROM table1 

Next, I need pass individual parameters to a stored procedure which accepts a single Id:

EXEC prc_complicated_calculation @Id

Assuming I can’t change prc_complicated_calculation. What is the best way to call it?

Answer 1

My first answer would be dynamic SQL for simple logic and lines of code.

DECLARE @sql NVARCHAR(MAX);
SET @sql = N'';

SELECT @sql = @sql + N'EXEC prc_complicted_calculation ' 
    + RTRIM(Id) + ';'
    FROM @Ids;

EXEC sp_executesql @sql;

You can also do this with a loop, but I think it’s more work for little gain (unless you are allergic to dynamic SQL).

DECLARE @i INT;
DECLARE c CURSOR LOCAL STATIC READ_ONLY FORWARD_ONLY
FOR SELECT Id FROM @Ids;

OPEN c;

FETCH NEXT FROM c INTO @i;

WHILE @@FETCH_STATUS = 0
BEGIN
    EXEC prc_complicated_calculation @i;

    FETCH NEXT FROM c INTO @i;
END

CLOSE c;
DEALLOCATE c;