Array-like access to variables in T-SQL

Question

In my stored procedure I have multiple similar variables @V1, @V2 ... @V20 (let's say 20 of them) FETCHED from a record. How would I use dynamic SQL to make 20 calls to another stored procedure using those variables as parameters?

Of course @V[i] syntax is incorrect, but it expresses the intent

    fetch next from maincursor into @status, @V1, @V2, ...

    while @i<21
    begin
       -- ??? execute sp_executesql 'SecondSP', '@myParam int', @myParam=@V[i]
       -- or 
       -- ??? execute SecondSP @V[i]
       set @i = @i+1
    end

Answer 1

As others have said, set up a temporary table, insert the values that you need into it. Then "iterate" through it executing the necessary SQL from those values. This will allow you to have 0 to MANY values to be executed, so you don't have to set up a variable for each.

The following is a complete sample of how you may go about doing that without cursors.

SET NOCOUNT ON

DECLARE @dict TABLE (
                    id          INT IDENTITY(1,1), -- a unique identity column for reference later
                    value       VARCHAR(50),       -- your parameter value to be passed into the procedure
                    executed    BIT                -- BIT to mark a record as being executed later
                    )

-- INSERT YOUR VALUES INTO @dict HERE
-- Set executed to 0 (so that the execution process will pick it up later)
-- This may be a SELECT statement into another table in your database to load the values into @dict
INSERT @dict
SELECT 'V1Value', 0 UNION ALL
SELECT 'V2Value', 0

DECLARE @currentid INT
DECLARE @currentvalue VARCHAR(50)
WHILE EXISTS(SELECT * FROM @dict WHERE executed = 0)
BEGIN
    -- Get the next record to execute
    SELECT 
    TOP 1   @currentid = id 
    FROM    @dict 
    WHERE   executed = 0

    -- Get the parameter value
    SELECT  @currentvalue = value
    FROM    @dict
    WHERE   id = @currentid

    -- EXECUTE THE SQL HERE
    --sp_executesql 'SecondSP', '@myParam int', @myParam = 
    PRINT   'SecondSP ' +  '@myParam int ' + '@myParam = ' + @currentvalue

    -- Mark record as having been executed
    UPDATE  d
    SET     executed = 1
    FROM    @dict d
    WHERE   id = @currentid
END